| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/09/28 12:16 | flow | patch-triage |
59mArgs:null Results: {
"EnableConfigs": [
"SERIAL_MAX3100",
"SPI"
],
"FocusSymbols": [],
"KMSANReasoning": "",
"NeedsKMSAN": false,
"Reasoning": "The patch modifies max3100_shutdown() and max3100_remove() in drivers/tty/serial/max3100.c, which is a driver for the Maxim MAX3100 SPI-attached UART chip. In standard virtualized environments (e.g. QEMU/GCE on amd64), there is no emulated MAX3100 hardware, and the SPI subsystem does not provide a userspace-accessible mechanism (such as sysfs new_device) to dynamically instantiate arbitrary SPI slave devices. Furthermore, max3100_remove() is a driver removal callback. Therefore, the modified code is structurally unreachable.",
"WorthFuzzing": false
} |
| 1/1 | 2026/09/28 12:16 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit b52f5c6b1864612a106805733f9096554613b0ce\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Mon Sep 28 12:16:35 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c\nindex 44b745fa26c6b..e8027c09c619a 100644\n--- a/drivers/tty/serial/max3100.c\n+++ b/drivers/tty/serial/max3100.c\n@@ -535,11 +535,11 @@ static void max3100_shutdown(struct uart_port *port)\n \ttimer_delete_sync(\u0026s-\u003etimer);\n \n \tif (s-\u003eworkqueue) {\n+\t\tfree_irq(port-\u003eirq, s);\n+\t\tcancel_work_sync(\u0026s-\u003ework);\n \t\tdestroy_workqueue(s-\u003eworkqueue);\n \t\ts-\u003eworkqueue = NULL;\n \t}\n-\tif (port-\u003eirq)\n-\t\tfree_irq(port-\u003eirq, s);\n \n \t/* set shutdown mode to save power */\n \tmax3100_sr(s, MAX3100_WC | MAX3100_SHDN, \u0026rx);\n@@ -752,6 +752,15 @@ static void max3100_remove(struct spi_device *spi)\n \t\tif (max3100s[i] == s) {\n \t\t\tdev_dbg(\u0026spi-\u003edev, \"%s: removing port %d\\n\", __func__, i);\n \t\t\tuart_remove_one_port(\u0026max3100_uart_driver, \u0026max3100s[i]-\u003eport);\n+\n+\t\t\ts-\u003eforce_end_work = 1;\n+\t\t\ttimer_shutdown_sync(\u0026s-\u003etimer);\n+\t\t\tif (s-\u003eworkqueue) {\n+\t\t\t\tfree_irq(s-\u003eport.irq, s);\n+\t\t\t\tcancel_work_sync(\u0026s-\u003ework);\n+\t\t\t\tdestroy_workqueue(s-\u003eworkqueue);\n+\t\t\t\ts-\u003eworkqueue = NULL;\n+\t\t\t}\n \t\t\tkfree(max3100s[i]);\n \t\t\tmax3100s[i] = NULL;\n \t\t\tbreak;\n"
} |
| 2/1 | 2026/09/28 12:16 | agent | patch-evaluator |
59mModel:core Args: null Results: {
"EnableConfigs": [
"SERIAL_MAX3100",
"SPI"
],
"FocusSymbols": [],
"Reasoning": "The patch modifies max3100_shutdown() and max3100_remove() in drivers/tty/serial/max3100.c, which is a driver for the Maxim MAX3100 SPI-attached UART chip. In standard virtualized environments (e.g. QEMU/GCE on amd64), there is no emulated MAX3100 hardware, and the SPI subsystem does not provide a userspace-accessible mechanism (such as sysfs new_device) to dynamically instantiate arbitrary SPI slave devices. Furthermore, max3100_remove() is a driver removal callback. Therefore, the modified code is structurally unreachable.",
"WorthFuzzing": false
}Instruction: You are an expert Linux kernel maintainer and security engineer.
Your job is to review a provided patch series and evaluate whether it warrants fuzzing with syzkaller.
IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on internal assumptions. You must actively use your code access
tools to inspect the actual source code, callers, and surrounding context.
================================================================================
1. CORE TRIAGE PHILOSOPHY
================================================================================
The goal of patch fuzzing is to discover crashes, regressions, exposed latent bugs,
and newly triggered assertions introduced by the patch series.
- REACHABILITY IS THE PRIMARY GATE:
Fuzzing can only discover bugs in code that can actually execute in standard virtualized
environments (GCE or QEMU, utilizing software-emulated devices like USB gadgets, netdev, tun/tap).
If the modified code is structurally unreachable (see Section 2), it MUST NOT be fuzzed,
regardless of whether it adds assertions or complex logic.
- DO NOT BLINDLY TRUST "NO FUNCTIONAL CHANGE" (NFCI) OR "REFACTORING" CLAIMS:
Patch authors routinely label changes as "cleanups", "refactorings", or state
"No functional change intended". Do NOT take these claims at face value.
Code refactorings that rearrange logic, introduce helper functions, or alter state management
in core subsystems frequently introduce subtle semantic shifts or uncover latent kernel bugs.
If reachable executable code is modified or refactored, it MUST be fuzzed.
- NEW OR MODIFIED ASSERTIONS IN REACHABLE CODE MUST BE FUZZED:
When a patch introduces or modifies runtime checks or assertions (e.g., WARN_ON*, VM_WARN_ON*,
BUG_ON*, lockdep_assert*) in reachable code paths, it enforces new or stricter invariants.
Even if the author believes the invariant always holds, fuzzing is essential to verify whether
an unusual sequence of operations can violate it.
================================================================================
2. WHEN TO RETURN WorthFuzzing=false (NEGATIVE CRITERIA)
================================================================================
Return WorthFuzzing=false ONLY IF all modified code falls strictly into one or more of these categories:
- Non-kernel and non-executable changes:
* Modifications to Documentation/, comments, or spelling fixes.
* User-space directories, self-tests, samples, or scripts (e.g., tools/, samples/, scripts/, usr/)
that do not affect the compiled kernel image (vmlinux) or kernel modules.
* Purely decorative logging (e.g., message strings in pr_err, printk, dev_info) or tracepoints
that do not alter control flow or data structures.
* Build system or Kconfig changes that do not alter compiled C logic.
- Structurally unreachable hardware:
* Vendor-specific PCIe switches, SmartNICs, or GPU drivers (e.g., mlxsw, pds_core, qed,
ionic, amdgpu) requiring physical ASIC/PCIe cards not emulated in standard QEMU.
- Unreachable execution paths:
* Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during
physical PCI hot-unplug or manual sysfs driver unbinding.
* Code paths exclusive to architectures other than the target architecture.
================================================================================
3. WHEN TO RETURN WorthFuzzing=true (POSITIVE CRITERIA)
================================================================================
Return WorthFuzzing=true whenever the patch touches reachable executable code, including:
- Core Subsystems:
* Any logic modifications in memory management (mm/), synchronization/locking (kernel/locking/),
BPF, scheduler, core networking, VFS, or syscall handling.
- Refactorings and Code Cleanups:
* Any restructuring of reachable data structures, helper abstractions, or algorithm flows.
- Runtime Assertions and Defensive Checks:
* Any introduction or alteration of assertions (WARN_ON*, VM_WARN_ON*, BUG_ON*, etc.) in reachable paths.
- Reachable Drivers and Protocols:
* Drivers accessible via virtual buses (virtio, USB gadget, loopback, netlink, binder, sockets, etc.).
================================================================================
4. EXTRACTING FocusSymbols (PREVENTING DILUTION)
================================================================================
When WorthFuzzing=true, you must extract specific kernel functions into FocusSymbols to guide the fuzzer:
- AVOID UBIQUITOUS LIFECYCLE HOT-PATHS:
Do NOT list generic, ubiquitous functions called by almost every program in the corpus
(including, but not limited to: general memory allocators and deallocators, page fault
and trap handlers, or core synchronization primitives; this is not an exhaustive list).
Listing ubiquitous functions causes the fuzzer to classify thousands of unrelated tests as "focused",
which severely dilutes fuzzing effort away from the actual changes.
- TARGET SPECIFIC FEATURE LOGIC AND ENTRYPOINTS:
List functions that specifically implement the logic being added or altered, or direct API entrypoints
for the subsystem feature under review.
- HANDLING STATIC INLINE FUNCTIONS IN HEADERS (.h):
Compiler-inlined static functions (such as static inlines in mm/*.h or include/linux/*.h) lack
distinct symbol addresses in vmlinux and cannot be targeted directly by symbol coverage filters.
If the changes are primarily in static inline helpers, identify non-static, feature-specific caller
functions in .c files that exercise them (avoiding ubiquitous lifecycle wrappers).
================================================================================
5. IDENTIFYING EnableConfigs
================================================================================
Identify any specific CONFIG_ options required to properly compile and reach the modified code:
- Inspect Kconfig files and #ifdef guards; do not make assumptions.
- Check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed.
- Strip any 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: Target architecture: amd64
For your convenience, here is the diff of the changes:
commit b52f5c6b1864612a106805733f9096554613b0ce
Author: syz-cluster <triage@syzkaller.com>
Date: Mon Sep 28 12:16:35 2026 +0000
syz-cluster: applied patch under review
diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c
index 44b745fa26c6b..e8027c09c619a 100644
--- a/drivers/tty/serial/max3100.c
+++ b/drivers/tty/serial/max3100.c
@@ -535,11 +535,11 @@ static void max3100_shutdown(struct uart_port *port)
timer_delete_sync(&s->timer);
if (s->workqueue) {
+ free_irq(port->irq, s);
+ cancel_work_sync(&s->work);
destroy_workqueue(s->workqueue);
s->workqueue = NULL;
}
- if (port->irq)
- free_irq(port->irq, s);
/* set shutdown mode to save power */
max3100_sr(s, MAX3100_WC | MAX3100_SHDN, &rx);
@@ -752,6 +752,15 @@ static void max3100_remove(struct spi_device *spi)
if (max3100s[i] == s) {
dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i);
uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port);
+
+ s->force_end_work = 1;
+ timer_shutdown_sync(&s->timer);
+ if (s->workqueue) {
+ free_irq(s->port.irq, s);
+ cancel_work_sync(&s->work);
+ destroy_workqueue(s->workqueue);
+ s->workqueue = NULL;
+ }
kfree(max3100s[i]);
max3100s[i] = NULL;
break;
|
| 3/2 | 2026/09/28 12:16 | llm | patch-evaluator |
13mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 3196 output: 32 thoughts: 346 Thoughts: **Analyzing a Patch to the `max3100` Serial Driver** Okay, let's dive into this. Someone's submitted a patch for `drivers/tty/serial/max3100.c`, and I need to evaluate it. My initial thought is to go through the changes methodically. First, I'll examine the diff itself. It looks like the patch primarily focuses on cleanup in the driver. Specifically, I see modifications in `max3100_shutdown` and `max3100_remove`. In `max3100_shutdown`, the sequence of resource release has been changed, with `cancel_work_sync` and `destroy_workqueue` now preceding `free_irq`. The more interesting change is in `max3100_remove`, where a more comprehensive cleanup sequence has been added, including a `force_end_work`, `timer_shutdown_sync`, and a conditional `free_irq`, `cancel_work_sync`, and `destroy_workqueue`. Interesting. Now, I need to understand the context. What is the `max3100` driver all about? Is it a common peripheral, or something more obscure? Crucially, I have to determine if this is a driver that's likely to be encountered in standard virtualized environments like QEMU or Google Compute Engine, which is how I usually test these things. The fact that the `max3100_remove` function takes an `spi_device` pointer is a big clue – it's an SPI device driver. To get a better understanding of the driver's reachability and potential dependencies, I'll need to dig into the `max3100.c` source code itself, along with the corresponding Kconfig entry. This will tell me what hardware this driver supports and whether it's enabled by default, or only under certain configurations. That's the next step to evaluating the overall impact of this patch. |
| 4/2 | 2026/09/28 12:29 | tool | grepper |
0mArgs:{
"Expression": "SERIAL_MAX3100",
"PathPrefix": "drivers/tty/serial"
}Results: {
"Output": "drivers/tty/serial/Kconfig=299=config SERIAL_TEGRA_UTC_CONSOLE\n--\ndrivers/tty/serial/Kconfig-311-\ndrivers/tty/serial/Kconfig:312:config SERIAL_MAX3100\ndrivers/tty/serial/Kconfig-313-\ttristate \"MAX3100/3110/3111/3222 support\"\n--\ndrivers/tty/serial/Makefile=49=obj-$(CONFIG_SERIAL_HS_LPC32XX)\t\t+= lpc32xx_hs.o\ndrivers/tty/serial/Makefile:50:obj-$(CONFIG_SERIAL_MAX3100)\t\t+= max3100.o\ndrivers/tty/serial/Makefile-51-obj-$(CONFIG_SERIAL_MAX310X)\t\t+= max310x.o\n"
} |
| 5/2 | 2026/09/28 12:29 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4218 output: 36 thoughts: 21 Thoughts: Here's my take on those thoughts: **Navigating the Kernel's Serial Driver Configuration** Okay, so I'm thinking I need to dive into the kernel configuration for serial drivers, specifically the `Kconfig` file. I'm pretty sure it's in the `drivers/tty/serial/` directory. Let me quickly pinpoint it – yeah, that’s where I was expecting. Now, I want to zero in on something related to the configuration options, which means I'll need to open `Kconfig` and take a look around line 312. I'll need to go through it carefully. I'm expecting to find what I'm looking for there. |
| 6/2 | 2026/09/28 12:29 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/Kconfig",
"FirstLine": 310,
"LineCount": 25
}Results: {
"Contents": " 310:\t\t If unsure, say Y.\n 311:\t\n 312:\tconfig SERIAL_MAX3100\n 313:\t\ttristate \"MAX3100/3110/3111/3222 support\"\n 314:\t\tdepends on SPI\n 315:\t\tselect SERIAL_CORE\n 316:\t\thelp\n 317:\t\t This selects support for an advanced UART from Maxim.\n 318:\t\t Supported ICs are MAX3100, MAX3110, MAX3111, MAX3222.\n 319:\t\n 320:\t\t Say Y here if you want to support these ICs.\n 321:\t\n 322:\tconfig SERIAL_MAX310X\n 323:\t\ttristate \"MAX310X support\"\n 324:\t\tdepends on (SPI_MASTER \u0026\u0026 !I2C) || I2C\n 325:\t\tselect SERIAL_CORE\n 326:\t\tselect REGMAP_SPI if SPI_MASTER\n 327:\t\tselect REGMAP_I2C if I2C\n 328:\t\thelp\n 329:\t\t This selects support for an advanced UART from Maxim (Dallas).\n 330:\t\t Supported ICs are MAX3107, MAX3108, MAX3109, MAX14830.\n 331:\t\t Each IC contains 128 words each of receive and transmit FIFO\n 332:\t\t that can be controlled through I2C or high-speed SPI.\n 333:\t\n 334:\t\t Say Y here if you want to support this ICs.\n"
} |
| 7/2 | 2026/09/28 12:29 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 4861 output: 40 thoughts: 47 Thoughts: Here's my thought process, as if I were delving into the code: **Analyzing the max3100 Driver Probe and SPI Registration** Okay, time to dig into this `max3100` driver and understand its interaction with the SPI subsystem. My primary goal here is to grasp exactly how the probing process unfolds and, crucially, how the device successfully registers itself with SPI. I need to trace the initialization sequence and understand the critical steps that make this driver tick. Therefore, the first place to look is within the kernel source itself, specifically the `drivers/tty/serial/max3100.c` file. I'll need to focus on two key areas within the code: the `probe` function, which is, obviously, the heart of the detection process, and the module initialization code, as it'll likely handle the fundamental setup and registration of the driver with the SPI framework. This should reveal the entry points and the conditions in which the device is registered. |
| 8/2 | 2026/09/28 12:29 | tool | grepper |
0mArgs:{
"Expression": "max3100_probe",
"PathPrefix": "drivers/tty/serial/max3100.c"
}Results: {
"Output": "drivers/tty/serial/max3100.c=682=static int uart_driver_registered;\ndrivers/tty/serial/max3100.c-683-\ndrivers/tty/serial/max3100.c:684:static int max3100_probe(struct spi_device *spi)\ndrivers/tty/serial/max3100.c-685-{\n--\ndrivers/tty/serial/max3100.c=833=static struct spi_driver max3100_driver = {\n--\ndrivers/tty/serial/max3100.c-838-\t},\ndrivers/tty/serial/max3100.c:839:\t.probe\t\t= max3100_probe,\ndrivers/tty/serial/max3100.c-840-\t.remove\t\t= max3100_remove,\n"
} |
| 9/2 | 2026/09/28 12:29 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 5391 output: 41 thoughts: 28 Thoughts: Okay, let's dive into this. Here's my thought process as I start to dissect `drivers/tty/serial/max3100.c`: **Initial Examination of the max3100.c Driver** Right, I'm going to start by zeroing in on the `probe` function and the code immediately around it. It's the entry point for device detection, so understanding how it's implemented is crucial. I need to see how the system identifies and claims a MAX3100 device. I'll pay close attention to the device IDs it's looking for, the resources it's requesting (IRQ, memory regions, etc.), and how it's configuring the underlying platform (be it I2C, SPI, whatever). I'm looking for clues about how it handles the interaction between the driver and the hardware. I want to build a mental map of the initialization sequence. Specifically, I'll be noting how the driver handles potential errors during probe, and the mechanisms by which the driver attaches itself to the serial subsystem. Any quirk handling or specific platform-dependent logic will be of great interest. |
| 10/2 | 2026/09/28 12:29 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/max3100.c",
"FirstLine": 680,
"LineCount": 80
}Results: {
"Contents": " 680:\t\t.nr = MAX_MAX3100,\n 681:\t};\n 682:\tstatic int uart_driver_registered;\n 683:\t\n 684:\tstatic int max3100_probe(struct spi_device *spi)\n 685:\t{\n 686:\t\tstruct device *dev = \u0026spi-\u003edev;\n 687:\t\tint i, retval;\n 688:\t\tu16 rx;\n 689:\t\n 690:\t\tmutex_lock(\u0026max3100s_lock);\n 691:\t\n 692:\t\tif (!uart_driver_registered) {\n 693:\t\t\tretval = uart_register_driver(\u0026max3100_uart_driver);\n 694:\t\t\tif (retval) {\n 695:\t\t\t\tmutex_unlock(\u0026max3100s_lock);\n 696:\t\t\t\treturn dev_err_probe(dev, retval, \"Couldn't register max3100 uart driver\\n\");\n 697:\t\t\t}\n 698:\t\n 699:\t\t\tuart_driver_registered = 1;\n 700:\t\t}\n 701:\t\n 702:\t\tfor (i = 0; i \u003c MAX_MAX3100; i++)\n 703:\t\t\tif (!max3100s[i])\n 704:\t\t\t\tbreak;\n 705:\t\tif (i == MAX_MAX3100) {\n 706:\t\t\tmutex_unlock(\u0026max3100s_lock);\n 707:\t\t\treturn dev_err_probe(dev, -ENOSPC, \"too many MAX3100 chips\\n\");\n 708:\t\t}\n 709:\t\n 710:\t\tmax3100s[i] = kzalloc_obj(struct max3100_port);\n 711:\t\tif (!max3100s[i]) {\n 712:\t\t\tmutex_unlock(\u0026max3100s_lock);\n 713:\t\t\treturn -ENOMEM;\n 714:\t\t}\n 715:\t\tmax3100s[i]-\u003espi = spi;\n 716:\t\tspin_lock_init(\u0026max3100s[i]-\u003econf_lock);\n 717:\t\tspi_set_drvdata(spi, max3100s[i]);\n 718:\t\tmax3100s[i]-\u003eminor = i;\n 719:\t\ttimer_setup(\u0026max3100s[i]-\u003etimer, max3100_timeout, 0);\n 720:\t\n 721:\t\tdev_dbg(\u0026spi-\u003edev, \"%s: adding port %d\\n\", __func__, i);\n 722:\t\tmax3100s[i]-\u003eport.irq = spi-\u003eirq;\n 723:\t\tmax3100s[i]-\u003eport.fifosize = 16;\n 724:\t\tmax3100s[i]-\u003eport.ops = \u0026max3100_ops;\n 725:\t\tmax3100s[i]-\u003eport.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;\n 726:\t\tmax3100s[i]-\u003eport.line = i;\n 727:\t\tmax3100s[i]-\u003eport.type = PORT_MAX3100;\n 728:\t\tmax3100s[i]-\u003eport.dev = \u0026spi-\u003edev;\n 729:\t\n 730:\t\t/* Read clock frequency from a property, uart_add_one_port() will fail if it's not set */\n 731:\t\tdevice_property_read_u32(dev, \"clock-frequency\", \u0026max3100s[i]-\u003eport.uartclk);\n 732:\t\n 733:\t\tretval = uart_add_one_port(\u0026max3100_uart_driver, \u0026max3100s[i]-\u003eport);\n 734:\t\tif (retval \u003c 0)\n 735:\t\t\tdev_err_probe(dev, retval, \"uart_add_one_port failed for line %d\\n\", i);\n 736:\t\n 737:\t\t/* set shutdown mode to save power. Will be woken-up on open */\n 738:\t\tmax3100_sr(max3100s[i], MAX3100_WC | MAX3100_SHDN, \u0026rx);\n 739:\t\tmutex_unlock(\u0026max3100s_lock);\n 740:\t\treturn 0;\n 741:\t}\n 742:\t\n 743:\tstatic void max3100_remove(struct spi_device *spi)\n 744:\t{\n 745:\t\tstruct max3100_port *s = spi_get_drvdata(spi);\n 746:\t\tint i;\n 747:\t\n 748:\t\tmutex_lock(\u0026max3100s_lock);\n 749:\t\n 750:\t\t/* find out the index for the chip we are removing */\n 751:\t\tfor (i = 0; i \u003c MAX_MAX3100; i++)\n 752:\t\t\tif (max3100s[i] == s) {\n 753:\t\t\t\tdev_dbg(\u0026spi-\u003edev, \"%s: removing port %d\\n\", __func__, i);\n 754:\t\t\t\tuart_remove_one_port(\u0026max3100_uart_driver, \u0026max3100s[i]-\u003eport);\n 755:\t\n 756:\t\t\t\ts-\u003eforce_end_work = 1;\n 757:\t\t\t\ttimer_shutdown_sync(\u0026s-\u003etimer);\n 758:\t\t\t\tif (s-\u003eworkqueue) {\n 759:\t\t\t\t\tfree_irq(s-\u003eport.irq, s);\n"
} |
| 11/2 | 2026/09/28 12:29 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 7216 output: 40 thoughts: 443 Thoughts: **My Thought Process on the Reachability of `max3100_probe`** Okay, so `max3100_probe` is triggered when an SPI device identifies itself as `max3100`. Now, the key question is, can I even get an SPI device instantiated in the environments I'm working with like QEMU, GCE, or syzkaller? Are there user-space methods or virtual buses that can create SPI devices, or am I hitting a structural limitation here? I need to figure out how SPI devices behave within syzkaller or the broader Linux kernel. Does Linux *allow* SPI device instantiation from user space? Are we talking about ACPI or DeviceTree here? Or SPI controllers? I need to verify syzkaller's current SPI support to assess if SPI devices *can* actually be created. Hold on, let me re-evaluate the core instruction: "REACHABILITY IS THE PRIMARY GATE." Right, fuzzing only applies to code that's executable in standard virtualized setups. If the modifications are unreachable, then I shouldn't bother with fuzzing it, no matter what assertions or complex logic is involved. Let me remind myself of the criteria from section 2. We're only returning `WorthFuzzing=false` if the code falls into things like non-kernel, non-executable changes, or structurally unreachable hardware. It mentions things like vendor-specific PCIe switches, SmartNICs, GPU drivers that rely on physical cards not emulated in standard QEMU. Also, unreachable execution paths, like driver teardown callbacks during hot-unplug or manual driver unbinding. Ah, there's `max3100_shutdown` too. That's worth thinking about. Is that a *driver shutdown*? Or is that something specific to `uart_ops`? I should examine `max3100_ops` to understand the full picture. |
| 12/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "max3100_ops",
"PathPrefix": "drivers/tty/serial/max3100.c"
}Results: {
"Output": "drivers/tty/serial/max3100.c=648=static void max3100_break_ctl(struct uart_port *port, int break_state)\n--\ndrivers/tty/serial/max3100.c-654-\ndrivers/tty/serial/max3100.c:655:static const struct uart_ops max3100_ops = {\ndrivers/tty/serial/max3100.c-656-\t.tx_empty\t= max3100_tx_empty,\n--\ndrivers/tty/serial/max3100.c=684=static int max3100_probe(struct spi_device *spi)\n--\ndrivers/tty/serial/max3100.c-723-\tmax3100s[i]-\u003eport.fifosize = 16;\ndrivers/tty/serial/max3100.c:724:\tmax3100s[i]-\u003eport.ops = \u0026max3100_ops;\ndrivers/tty/serial/max3100.c-725-\tmax3100s[i]-\u003eport.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;\n"
} |
| 13/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 8424 output: 41 thoughts: 15 Thoughts: Okay, let's dive into this. Here's my thought process summarized, assuming I'm already pretty familiar with this code and context: **Analyzing `max3100_ops`** Right, let's get right down to it. I need to refresh my memory on the specifics of how the `max3100_ops` structure is defined. It's crucial for understanding how the driver interacts with the hardware. I need to make sure I know what function pointers are in there, what their signatures are, and what data structures they operate on. This structure essentially dictates the entire operational interface, so any modifications or debugging efforts start here. Knowing the exact structure is the key. Let's see... |
| 14/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/max3100.c",
"FirstLine": 650,
"LineCount": 30
}Results: {
"Contents": " 650:\t\tstruct max3100_port *s = to_max3100_port(port);\n 651:\t\n 652:\t\tdev_dbg(\u0026s-\u003espi-\u003edev, \"%s\\n\", __func__);\n 653:\t}\n 654:\t\n 655:\tstatic const struct uart_ops max3100_ops = {\n 656:\t\t.tx_empty\t= max3100_tx_empty,\n 657:\t\t.set_mctrl\t= max3100_set_mctrl,\n 658:\t\t.get_mctrl\t= max3100_get_mctrl,\n 659:\t\t.stop_tx = max3100_stop_tx,\n 660:\t\t.start_tx\t= max3100_start_tx,\n 661:\t\t.stop_rx\t= max3100_stop_rx,\n 662:\t\t.enable_ms = max3100_enable_ms,\n 663:\t\t.break_ctl = max3100_break_ctl,\n 664:\t\t.startup\t= max3100_startup,\n 665:\t\t.shutdown\t= max3100_shutdown,\n 666:\t\t.set_termios\t= max3100_set_termios,\n 667:\t\t.type\t\t= max3100_type,\n 668:\t\t.release_port = max3100_release_port,\n 669:\t\t.request_port = max3100_request_port,\n 670:\t\t.config_port\t= max3100_config_port,\n 671:\t\t.verify_port\t= max3100_verify_port,\n 672:\t};\n 673:\t\n 674:\tstatic struct uart_driver max3100_uart_driver = {\n 675:\t\t.owner = THIS_MODULE,\n 676:\t\t.driver_name = \"ttyMAX\",\n 677:\t\t.dev_name = \"ttyMAX\",\n 678:\t\t.major = MAX3100_MAJOR,\n 679:\t\t.minor = MAX3100_MINOR,\n"
} |
| 15/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 9232 output: 41 thoughts: 123 Thoughts: Okay, let's break this down. **Investigating the MAX3100 UART Shutdown Sequence** Right, so `max3100_shutdown` is definitely tied to `uart_ops.shutdown`. That makes sense. It's invoked when a `/dev/ttyMAXn` port is closed or experiences a hang-up. But hold on a second... how does that `/dev/ttyMAXn` even *get* created in the first place? I need to trace this back. My initial thought is to look at the SPI device. Does the system ever probe an SPI device specifically for the MAX3100? Let's dig in. Okay, it seems `max3100_probe` is the function responsible. This would be called if an SPI device's name matches "max3100" *and* it's compatible with the `max3100_driver`. So, I really need to check the device match table within `max3100_driver`. That's where I'll see what criteria must be met for the driver to even consider attaching to an SPI device. That's the key to understanding how these `/dev/ttyMAXn` devices are created in the first place, and thus, how the `shutdown` routine is ultimately triggered. |
| 16/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/max3100.c",
"FirstLine": 810,
"LineCount": 40
}Results: {
"Contents": " 810:\t\tenable_irq(s-\u003eport.irq);\n 811:\t\n 812:\t\ts-\u003econf_commit = 1;\n 813:\t\tif (s-\u003eworkqueue)\n 814:\t\t\tmax3100_dowork(s);\n 815:\t\n 816:\t\treturn 0;\n 817:\t}\n 818:\t\n 819:\tstatic DEFINE_SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume);\n 820:\t\n 821:\tstatic const struct spi_device_id max3100_spi_id[] = {\n 822:\t\t{ \"max3100\" },\n 823:\t\t{ }\n 824:\t};\n 825:\tMODULE_DEVICE_TABLE(spi, max3100_spi_id);\n 826:\t\n 827:\tstatic const struct of_device_id max3100_of_match[] = {\n 828:\t\t{ .compatible = \"maxim,max3100\" },\n 829:\t\t{ }\n 830:\t};\n 831:\tMODULE_DEVICE_TABLE(of, max3100_of_match);\n 832:\t\n 833:\tstatic struct spi_driver max3100_driver = {\n 834:\t\t.driver = {\n 835:\t\t\t.name\t\t= \"max3100\",\n 836:\t\t\t.of_match_table\t= max3100_of_match,\n 837:\t\t\t.pm\t\t= pm_sleep_ptr(\u0026max3100_pm_ops),\n 838:\t\t},\n 839:\t\t.probe\t\t= max3100_probe,\n 840:\t\t.remove\t\t= max3100_remove,\n 841:\t\t.id_table\t= max3100_spi_id,\n 842:\t};\n 843:\t\n 844:\tmodule_spi_driver(max3100_driver);\n 845:\t\n 846:\tMODULE_DESCRIPTION(\"MAX3100 driver\");\n 847:\tMODULE_AUTHOR(\"Christian Pellegrin \u003cchripell@evolware.org\u003e\");\n 848:\tMODULE_LICENSE(\"GPL\");\n"
} |
| 17/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 10309 output: 26 thoughts: 113 Thoughts: **Investigating SPI Device Instantiation in a Virtual Environment** Okay, so I need to figure out how to work with SPI devices in a virtual environment. Specifically, can I create or probe them within QEMU, Google Compute Engine, or using syzkaller? First, I should probably understand how SPI devices are typically brought up in Linux. Let's start with the basics. Can these devices be instantiated dynamically? I need to find out if there's a mechanism like the `new_device` feature in sysfs that I'm familiar with from I2C. Remember, with I2C, you can dynamically create devices through `/sys/bus/i2c/devices/i2c-X/new_device`. Does something similar exist for SPI? Let's delve into the kernel code and search the `drivers/spi` directory for any occurrences of `new_device` to see if there's a parallel. |
| 18/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "new_device",
"PathPrefix": "drivers/spi"
}Results: {
"Output": "drivers/spi/spi-altera-dfl.c=124=static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)\n--\ndrivers/spi/spi-altera-dfl.c-174-\ndrivers/spi/spi-altera-dfl.c:175:\tif (!spi_new_device(host, \u0026board_info)) {\ndrivers/spi/spi-altera-dfl.c-176-\t\tdev_err(dev, \"%s failed to create SPI device: %s\\n\",\n--\ndrivers/spi/spi-altera-platform.c=35=static int altera_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-altera-platform.c-119-\t\tfor (i = 0; i \u003c pdata-\u003enum_devices; i++) {\ndrivers/spi/spi-altera-platform.c:120:\t\t\tif (!spi_new_device(host, pdata-\u003edevices + i))\ndrivers/spi/spi-altera-platform.c-121-\t\t\t\tdev_warn(\u0026pdev-\u003edev,\n--\ndrivers/spi/spi-butterfly.c=176=static void butterfly_attach(struct parport *p)\n--\ndrivers/spi/spi-butterfly.c-265-\tpp-\u003einfo[0].controller_data = pp;\ndrivers/spi/spi-butterfly.c:266:\tpp-\u003edataflash = spi_new_device(pp-\u003ebitbang.ctlr, \u0026pp-\u003einfo[0]);\ndrivers/spi/spi-butterfly.c-267-\tif (pp-\u003edataflash)\n--\ndrivers/spi/spi-ch341.c=141=static int ch341_probe(struct usb_interface *intf,\n--\ndrivers/spi/spi-ch341.c-206-\ndrivers/spi/spi-ch341.c:207:\tch341-\u003espidev = spi_new_device(ctrl, \u0026chip);\ndrivers/spi/spi-ch341.c-208-\tif (!ch341-\u003espidev) {\n--\ndrivers/spi/spi-cs42l43.c=312=static int cs42l43_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cs42l43.c-426-\ndrivers/spi/spi-cs42l43.c:427:\t\tif (!spi_new_device(priv-\u003ectlr, ampl_info))\ndrivers/spi/spi-cs42l43.c-428-\t\t\treturn dev_err_probe(priv-\u003edev, -ENODEV,\n--\ndrivers/spi/spi-cs42l43.c-430-\ndrivers/spi/spi-cs42l43.c:431:\t\tif (!spi_new_device(priv-\u003ectlr, ampr_info))\ndrivers/spi/spi-cs42l43.c-432-\t\t\treturn dev_err_probe(priv-\u003edev, -ENODEV,\n--\ndrivers/spi/spi-intel.c=1375=static int intel_spi_populate_chip(struct intel_spi *ispi)\n--\ndrivers/spi/spi-intel.c-1401-\ndrivers/spi/spi-intel.c:1402:\tif (!spi_new_device(ispi-\u003ehost, \u0026chip))\ndrivers/spi/spi-intel.c-1403-\t\treturn -ENODEV;\n--\ndrivers/spi/spi-intel.c-1430-\ndrivers/spi/spi-intel.c:1431:\tif (!spi_new_device(ispi-\u003ehost, \u0026chip))\ndrivers/spi/spi-intel.c-1432-\t\treturn -ENODEV;\n--\ndrivers/spi/spi-kspi2.c=310=static int kspi2_register_devices(struct kspi2 *kspi)\n--\ndrivers/spi/spi-kspi2.c-316-\tfor (i = 0; i \u003c kspi-\u003eauxdev-\u003einfo_size; i++) {\ndrivers/spi/spi-kspi2.c:317:\t\tstruct spi_device *device = spi_new_device(kspi-\u003ehost, \u0026info[i]);\ndrivers/spi/spi-kspi2.c-318-\n--\ndrivers/spi/spi-lm70llp.c=188=static void spi_lm70llp_attach(struct parport *p)\n--\ndrivers/spi/spi-lm70llp.c-266-\tpp-\u003einfo.controller_data = pp;\ndrivers/spi/spi-lm70llp.c:267:\tpp-\u003espidev_lm70 = spi_new_device(pp-\u003ebitbang.ctlr, \u0026pp-\u003einfo);\ndrivers/spi/spi-lm70llp.c-268-\tif (pp-\u003espidev_lm70)\n--\ndrivers/spi/spi-lm70llp.c-271-\telse {\ndrivers/spi/spi-lm70llp.c:272:\t\tdev_warn(\u0026pd-\u003edev, \"spi_new_device failed\\n\");\ndrivers/spi/spi-lm70llp.c-273-\t\tstatus = -ENODEV;\n--\ndrivers/spi/spi-xilinx.c=402=static int xilinx_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-xilinx.c-509-\t\tfor (i = 0; i \u003c pdata-\u003enum_devices; i++)\ndrivers/spi/spi-xilinx.c:510:\t\t\tspi_new_device(host, pdata-\u003edevices + i);\ndrivers/spi/spi-xilinx.c-511-\t}\n--\ndrivers/spi/spi.c=791=EXPORT_SYMBOL_GPL(spi_add_device);\n--\ndrivers/spi/spi.c-793-/**\ndrivers/spi/spi.c:794: * spi_new_device - instantiate one new SPI device\ndrivers/spi/spi.c-795- * @ctlr: Controller to which device is connected\n--\ndrivers/spi/spi.c-806- */\ndrivers/spi/spi.c:807:struct spi_device *spi_new_device(struct spi_controller *ctlr,\ndrivers/spi/spi.c-808-\t\t\t\t struct spi_board_info *chip)\n--\ndrivers/spi/spi.c-862-}\ndrivers/spi/spi.c:863:EXPORT_SYMBOL_GPL(spi_new_device);\ndrivers/spi/spi.c-864-\n--\ndrivers/spi/spi.c=893=static void spi_match_controller_to_boardinfo(struct spi_controller *ctlr,\n--\ndrivers/spi/spi.c-900-\ndrivers/spi/spi.c:901:\tdev = spi_new_device(ctlr, bi);\ndrivers/spi/spi.c-902-\tif (!dev)\n"
} |
| 19/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12423 output: 30 thoughts: 51 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: **SPI Device Instantiation – A Sysfs Intrigue** Alright, I'm taking a look at how we instantiate SPI devices, and something's immediately jumping out. I'm noticing that `spi_new_device` isn't directly exposed through sysfs the way we've got for I2C devices with the `new_device` interface. That feels...odd. I'm used to a consistent pattern here, and the lack of a straightforward sysfs entry for SPI device creation is making me curious. So, the question that springs to mind is, *is* there any equivalent sysfs mechanism for bringing up new SPI devices? Or am I missing something fundamental about the architectural differences between I2C and SPI device management? Time to dive into the kernel source. I'll need to check the SPI core, specifically `drivers/spi/spi.c`, to see if there's an alternative, or if device instantiation is handled differently entirely. I'll be looking for something that relates to device probing or bus registration, and how that might be exposed, or not, through the sysfs hierarchy. This discrepancy needs to be understood. |
| 20/2 | 2026/09/28 12:30 | tool | grepper |
0mError:no matches Args: {
"Expression": "DEVICE_ATTR.*new_device",
"PathPrefix": "drivers/spi"
}Results: {
"error": "no matches"
} |
| 21/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 12783 output: 35 thoughts: 29 Thoughts: Okay, here's my summary, taking the perspective of someone knowledgeable in embedded systems and device driver development: **Initial Investigation into SPI Bus Attributes** Alright, let's dive in. When I'm troubleshooting or extending SPI functionality, my first instinct is to go directly to the source. Specifically, I need to check out `drivers/spi/spi.c`. I expect to find the core implementation of the SPI bus driver there, and that's where I anticipate the crucial details regarding its attributes are defined. My primary focus is to identify how the SPI bus's characteristics are exposed. I'm immediately looking for references to `bus_type` or `class` attributes – those are key indicators of how the driver interacts with the system's device model, how it presents itself, and how other components might interact with the bus. These attributes are often exposed through `sysfs`, which is my preferred method for control and instrumentation. So, I’ll be scanning for mentions of `sysfs` as well. This will show me the interface for configuring and managing the SPI bus and its attached devices. I'm expecting to find details around clock speed, mode (CPOL, CPHA), and other configuration options that are necessary to make it work. |
| 22/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "ATTRIBUTE_GROUPS|DEVICE_ATTR",
"PathPrefix": "drivers/spi/spi.c"
}Results: {
"Output": "drivers/spi/spi.c=59=modalias_show(struct device *dev, struct device_attribute *a, char *buf)\n--\ndrivers/spi/spi.c-69-}\ndrivers/spi/spi.c:70:static DEVICE_ATTR_RO(modalias);\ndrivers/spi/spi.c-71-\n--\ndrivers/spi/spi.c=85=static ssize_t driver_override_show(struct device *dev,\n--\ndrivers/spi/spi.c-90-}\ndrivers/spi/spi.c:91:static DEVICE_ATTR_RW(driver_override);\ndrivers/spi/spi.c-92-\n--\ndrivers/spi/spi.c=3146=static ssize_t slave_store(struct device *dev, struct device_attribute *attr,\n--\ndrivers/spi/spi.c-3184-\ndrivers/spi/spi.c:3185:static DEVICE_ATTR_RW(slave);\ndrivers/spi/spi.c-3186-\n"
} |
| 23/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13369 output: 37 thoughts: 106 Thoughts: **SPI over USB - A Quick Mental Check** Okay, so I'm wondering if we can actually treat SPI devices as if they were USB-connected. Specifically, can we instantiate them using something like a USB-to-SPI bridge – think CH341, FTDI, CP210x, or even DLPC devices? I'm picturing a logical architecture here. Right, let me just quickly glance back at that `spi-ch341.c` code. Hmm, there it is: `ch341->spidev = spi_new_device(ctrl, &chip);` That's interesting... So, the driver is definitely creating an SPI device instance. But I need to figure out *which* chip it's instantiating. I need to dig into `spi-ch341.c` a little deeper to confirm the device ID. Let's see... |
| 24/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "spi_new_device",
"PathPrefix": "drivers/spi/spi-ch341.c"
}Results: {
"Output": "drivers/spi/spi-ch341.c=141=static int ch341_probe(struct usb_interface *intf,\n--\ndrivers/spi/spi-ch341.c-206-\ndrivers/spi/spi-ch341.c:207:\tch341-\u003espidev = spi_new_device(ctrl, \u0026chip);\ndrivers/spi/spi-ch341.c-208-\tif (!ch341-\u003espidev) {\n"
} |
| 25/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 13842 output: 40 thoughts: 22 Thoughts: Okay, let's dive into this. Here's my take on that line of code, rendered as if it's my own thought process: **Diving into `spi-ch341.c`, Line 200** Alright, time to crack open this `spi-ch341.c` file and zero in on line 200. What's the context here? I need to understand what this specific line is trying to achieve within the broader picture of the CH341's SPI implementation. I'm assuming it's probably related to some fundamental SPI transaction control, maybe clock configuration, data transfer, or possibly even device-specific initialization. Given this is a driver, I expect the code to interface directly with the CH341 hardware. Is it setting up the communication parameters, handling data buffers, managing interrupts, or is it related to something more specific like chip select assertion/deassertion? I'll need to look around this section of code to get a handle on what the bigger picture is. The surrounding code will provide the crucial context. Let's see... |
| 26/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/spi/spi-ch341.c",
"FirstLine": 195,
"LineCount": 20
}Results: {
"Contents": " 195:\t\tret = ch341_config_stream(ch341);\n 196:\t\tif (ret)\n 197:\t\t\tgoto err_kill_urb;\n 198:\t\n 199:\t\tret = ch341_enable_pins(ch341, true);\n 200:\t\tif (ret)\n 201:\t\t\tgoto err_kill_urb;\n 202:\t\n 203:\t\tret = spi_register_controller(ctrl);\n 204:\t\tif (ret)\n 205:\t\t\tgoto err_disable_pins;\n 206:\t\n 207:\t\tch341-\u003espidev = spi_new_device(ctrl, \u0026chip);\n 208:\t\tif (!ch341-\u003espidev) {\n 209:\t\t\tret = -ENOMEM;\n 210:\t\t\tgoto err_unregister;\n 211:\t\t}\n 212:\t\n 213:\t\treturn 0;\n 214:\t\n"
} |
| 27/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 14416 output: 40 thoughts: 32 Thoughts: Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person: **Decoding the `chip` Variable in `spi-ch341.c`** Alright, I'm diving into this `spi-ch341.c` code again. Specifically, I need to refresh my memory on the context of the `chip` variable. It's a key element in the CH341 SPI driver, and I want to quickly re-establish the purpose this variable serves. Okay, line 150 to 190, that's the range I need to examine. I'm focusing in on where it's defined and how it is used. I'll mentally map out its type, likely a struct. I'm going to look to understand its member fields. How is the SPI transaction tied to the `chip` object? Is this a per-device data structure or is this global? Let me make sure I'm not missing anything fundamental about how the driver handles multiple CH341 devices. |
| 28/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/spi/spi-ch341.c",
"FirstLine": 150,
"LineCount": 40
}Results: {
"Contents": " 150:\t\tret = usb_find_common_endpoints(intf-\u003ecur_altsetting, \u0026in, \u0026out, NULL,\n 151:\t\t\t\t\t\tNULL);\n 152:\t\tif (ret)\n 153:\t\t\treturn ret;\n 154:\t\n 155:\t\tctrl = devm_spi_alloc_host(\u0026intf-\u003edev, sizeof(struct ch341_spi_dev));\n 156:\t\tif (!ctrl)\n 157:\t\t\treturn -ENOMEM;\n 158:\t\n 159:\t\tch341 = spi_controller_get_devdata(ctrl);\n 160:\t\tch341-\u003ectrl = ctrl;\n 161:\t\tch341-\u003eudev = udev;\n 162:\t\tch341-\u003ewrite_pipe = usb_sndbulkpipe(udev, usb_endpoint_num(out));\n 163:\t\tch341-\u003eread_pipe = usb_rcvbulkpipe(udev, usb_endpoint_num(in));\n 164:\t\n 165:\t\tch341-\u003erx_len = usb_endpoint_maxp(in);\n 166:\t\tch341-\u003erx_buf = devm_kzalloc(\u0026intf-\u003edev, ch341-\u003erx_len, GFP_KERNEL);\n 167:\t\tif (!ch341-\u003erx_buf)\n 168:\t\t\treturn -ENOMEM;\n 169:\t\n 170:\t\tch341-\u003erx_urb = usb_alloc_urb(0, GFP_KERNEL);\n 171:\t\tif (!ch341-\u003erx_urb)\n 172:\t\t\treturn -ENOMEM;\n 173:\t\n 174:\t\tch341-\u003etx_buf = devm_kzalloc(\u0026intf-\u003edev, CH341_PACKET_LENGTH, GFP_KERNEL);\n 175:\t\tif (!ch341-\u003etx_buf) {\n 176:\t\t\tret = -ENOMEM;\n 177:\t\t\tgoto err_free_urb;\n 178:\t\t}\n 179:\t\n 180:\t\tusb_fill_bulk_urb(ch341-\u003erx_urb, udev, ch341-\u003eread_pipe, ch341-\u003erx_buf,\n 181:\t\t\t\t ch341-\u003erx_len, ch341_recv, ch341);\n 182:\t\n 183:\t\tret = usb_submit_urb(ch341-\u003erx_urb, GFP_KERNEL);\n 184:\t\tif (ret)\n 185:\t\t\tgoto err_free_urb;\n 186:\t\n 187:\t\tctrl-\u003ebus_num = -1;\n 188:\t\tctrl-\u003emode_bits = SPI_CPHA;\n 189:\t\tctrl-\u003etransfer_one = ch341_transfer_one;\n"
} |
| 29/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 15461 output: 40 thoughts: 20 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Tracing Down the Definition of "Chip"** Okay, so we need to pinpoint exactly how "chip" is defined within this context. My immediate instinct is to look for a formal definition, likely within the standard nomenclature or a specific section of the documentation. Lines 130-150 sound like a likely place to start. I'm assuming that it's going to be in an adjacent section, but there's no harm in being rigorous and validating assumptions. Let's see if we can find something definitive within that range. It will likely include parameters that clarify exactly what this word is intended to capture within the scope of our work. I need to be sure before I move forward, so let's check it out. |
| 30/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/spi/spi-ch341.c",
"FirstLine": 130,
"LineCount": 20
}Results: {
"Contents": " 130:\t\tch341-\u003etx_buf[2] = CH341A_CMD_UIO_STM_DIR | (enable ? 0x3f : 0x00);\n 131:\t\tch341-\u003etx_buf[3] = CH341A_CMD_UIO_STM_END;\n 132:\t\n 133:\t\treturn usb_bulk_msg(ch341-\u003eudev, ch341-\u003ewrite_pipe, ch341-\u003etx_buf, 4,\n 134:\t\t\t\t NULL, CH341_DEFAULT_TIMEOUT);\n 135:\t}\n 136:\t\n 137:\tstatic struct spi_board_info chip = {\n 138:\t\t.modalias = \"spi-ch341a\",\n 139:\t};\n 140:\t\n 141:\tstatic int ch341_probe(struct usb_interface *intf,\n 142:\t\t\t const struct usb_device_id *id)\n 143:\t{\n 144:\t\tstruct usb_device *udev = interface_to_usbdev(intf);\n 145:\t\tstruct usb_endpoint_descriptor *in, *out;\n 146:\t\tstruct ch341_spi_dev *ch341;\n 147:\t\tstruct spi_controller *ctrl;\n 148:\t\tint ret;\n 149:\t\n"
} |
| 31/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 16070 output: 33 thoughts: 336 Thoughts: **Investigating SPI Driver Overrides for the MAX3100** Okay, so the system is registering the device as `spi-ch341a`, not the `max3100` driver. I'm wondering if I can force it, right? Can I use `driver_override` to bind the SPI device to the `max3100` driver? Let me think... wait, yeah, `driver_override` is exposed through sysfs. That's got potential. So, if I've got an SPI device instantiated by, say, `spi-ch341a`, can I use that `driver_override` mechanism to tell the system "Hey, actually, treat this as a `max3100`"? Right, let me double-check how the `max3100` driver is actually *supposed* to work. Ah, here we go, in `max3100_probe`... Okay, line 731 catches my eye immediately: `device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk);` It looks like it expects the "clock-frequency" property to be set. And then it calls `uart_add_one_port`. Okay, so if that "clock-frequency" property *isn't* set, what exactly happens in `uart_add_one_port`? I need to dig into that function now to see what the implications are for my override attempt. I need to understand if this is a hard requirement, or if there's some graceful fallback. |
| 32/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "uartclk",
"PathPrefix": "drivers/tty/serial/serial_core.c"
}Results: {
"Output": "drivers/tty/serial/serial_core.c=566=uart_get_divisor(struct uart_port *port, unsigned int baud)\n--\ndrivers/tty/serial/serial_core.c-575-\telse\ndrivers/tty/serial/serial_core.c:576:\t\tquot = DIV_ROUND_CLOSEST(port-\u003euartclk, 16 * baud);\ndrivers/tty/serial/serial_core.c-577-\n--\ndrivers/tty/serial/serial_core.c=784=static int uart_get_info(struct tty_port *port, struct serial_struct *retinfo)\n--\ndrivers/tty/serial/serial_core.c-808-\tretinfo-\u003exmit_fifo_size = uport-\u003efifosize;\ndrivers/tty/serial/serial_core.c:809:\tretinfo-\u003ebaud_base\t = uport-\u003euartclk / 16;\ndrivers/tty/serial/serial_core.c-810-\tretinfo-\u003eclose_delay\t = jiffies_to_msecs(port-\u003eclose_delay) / 10;\n--\ndrivers/tty/serial/serial_core.c=887=static int uart_set_info(struct tty_struct *tty, struct tty_port *port,\n--\ndrivers/tty/serial/serial_core.c-932-\tif (!(uport-\u003eflags \u0026 UPF_FIXED_PORT)) {\ndrivers/tty/serial/serial_core.c:933:\t\tunsigned int uartclk = new_info-\u003ebaud_base * 16;\ndrivers/tty/serial/serial_core.c-934-\t\t/* check needs to be done here before other settings made */\ndrivers/tty/serial/serial_core.c:935:\t\tif (uartclk == 0)\ndrivers/tty/serial/serial_core.c-936-\t\t\treturn -EINVAL;\n--\ndrivers/tty/serial/serial_core.c-939-\t\tif (change_irq || change_port ||\ndrivers/tty/serial/serial_core.c:940:\t\t (new_info-\u003ebaud_base != uport-\u003euartclk / 16) ||\ndrivers/tty/serial/serial_core.c-941-\t\t (close_delay != port-\u003eclose_delay) ||\n--\ndrivers/tty/serial/serial_core.c-990-\tif (!(uport-\u003eflags \u0026 UPF_FIXED_PORT))\ndrivers/tty/serial/serial_core.c:991:\t\tuport-\u003euartclk = new_info-\u003ebaud_base * 16;\ndrivers/tty/serial/serial_core.c-992-\tuport-\u003eflags = (uport-\u003eflags \u0026 ~UPF_CHANGE_MASK) |\n--\ndrivers/tty/serial/serial_core.c=2463=uart_report_port(struct uart_driver *drv, struct uart_port *port)\n--\ndrivers/tty/serial/serial_core.c-2492-\t port-\u003ename,\ndrivers/tty/serial/serial_core.c:2493:\t address, port-\u003eirq, port-\u003euartclk / 16, uart_type(port));\ndrivers/tty/serial/serial_core.c-2494-\n--\ndrivers/tty/serial/serial_core.c-2500-\t\t\tport-\u003ename,\ndrivers/tty/serial/serial_core.c:2501:\t\t\tport-\u003euartclk / 8, port-\u003euartclk / 4);\ndrivers/tty/serial/serial_core.c-2502-}\n--\ndrivers/tty/serial/serial_core.c=2818=EXPORT_SYMBOL_GPL(uart_console_device);\ndrivers/tty/serial/serial_core.c-2819-\ndrivers/tty/serial/serial_core.c:2820:static ssize_t uartclk_show(struct device *dev,\ndrivers/tty/serial/serial_core.c-2821-\tstruct device_attribute *attr, char *buf)\n--\ndrivers/tty/serial/serial_core.c=2971=static ssize_t console_store(struct device *dev,\n--\ndrivers/tty/serial/serial_core.c-3004-\ndrivers/tty/serial/serial_core.c:3005:static DEVICE_ATTR_RO(uartclk);\ndrivers/tty/serial/serial_core.c-3006-static DEVICE_ATTR_RO(type);\n--\ndrivers/tty/serial/serial_core.c=3020=static struct attribute *tty_dev_attrs[] = {\ndrivers/tty/serial/serial_core.c:3021:\t\u0026dev_attr_uartclk.attr,\ndrivers/tty/serial/serial_core.c-3022-\t\u0026dev_attr_type.attr,\n"
} |
| 33/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 17999 output: 39 thoughts: 41 Thoughts: Okay, let's dive into this. Here's my take on those thoughts, as if they're my own: **Investigating the UART Port Addition** Hold on a second, something just pinged my radar. Let's get a closer look at `uart_add_one_port`. My initial instinct says that's where the action is for adding a UART port to the system. I know this code, and I know where to find it. Alright, I'm heading straight to `drivers/tty/serial/serial_core.c`. Time to pull up the source and dig into `uart_add_one_port`. I need to understand exactly how this function works, how it's called, what data structures it manipulates, and what implications its execution has on the overall driver model. I need to refresh my understanding, maybe there is something new to learn here. Understanding this function is going to be key to whatever I'm troubleshooting or enhancing. Let's see what's actually going on in there! |
| 34/2 | 2026/09/28 12:30 | tool | grepper |
0mError:no matches Args: {
"Expression": "int uart_add_one_port",
"PathPrefix": "drivers/tty/serial/serial_core.c"
}Results: {
"error": "no matches"
} |
| 35/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18313 output: 38 thoughts: 13 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience, presented in the first person: **Navigating the UART Landscape** Alright, let's get down to brass tacks. The objective here is to locate and examine the `uart_add_one_port` function. My initial thought process is to understand its role and place within the UART driver framework, and the possible implications of this function for my own work. My knowledge of the kernel's UART subsystem immediately prompts considerations around how ports are registered, the data structures used (likely `uart_port` and associated structures), and the potential interactions with platform devices or other bus drivers. My experience tells me this function is a key entry point for adding a new UART port to the system. I anticipate that this function would likely be responsible for allocating necessary resources (memory, IRQs, etc.), initializing the port structure, and registering the port with the core UART driver. I can now begin my investigation! |
| 36/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "uart_add_one_port",
"PathPrefix": "drivers/tty/serial/serial_core.c"
}Results: {
"Output": "drivers/tty/serial/serial_core.c=2704=static const struct tty_port_operations uart_port_ops = {\n--\ndrivers/tty/serial/serial_core.c-2721- * @drv-\u003eport should be %NULL, and the per-port structures should be registered\ndrivers/tty/serial/serial_core.c:2722: * using uart_add_one_port() after this call has succeeded.\ndrivers/tty/serial/serial_core.c-2723- *\n--\ndrivers/tty/serial/serial_core.c=2785=EXPORT_SYMBOL(uart_register_driver);\n--\ndrivers/tty/serial/serial_core.c-2792- * driver must have removed all its ports via the uart_remove_one_port() if it\ndrivers/tty/serial/serial_core.c:2793: * registered them with uart_add_one_port(). (I.e. @drv-\u003eport is %NULL.)\ndrivers/tty/serial/serial_core.c-2794- *\n"
} |
| 37/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 18837 output: 39 thoughts: 17 Thoughts: Okay, here's my attempt at summarizing that thought process, tailored for an expert audience, and written in the first person: **Tracking Down `uart_add_one_port`** Alright, time to get to work. My immediate focus is locating the definition and usage of `uart_add_one_port`. This function call is pretty important in the UART driver landscape, so I need to understand its role and how it’s being utilized within the kernel source. To do this efficiently, I'm going to leverage my familiarity with the kernel's source tree structure. I'll start with a broader search across the entire tree, probably using a tool like `grep` or `cscope`, or even a more sophisticated IDE search, depending on the scale and complexity of the project I'm working in. I'll need to be mindful of potential name collisions, and I'll likely use context-sensitive searching to narrow down the results. My primary goals are to identify: * **The declaration:** Where is this function defined? Understanding its arguments, return type, and any internal structures it interacts with is key. This will also immediately point me to the relevant header files and possibly the drivers where it is defined. * **The callers:** Who is calling `uart_add_one_port`, and under what circumstances? This is the most important part because this shows me the logical flow. I am looking for the contexts where UART ports are created or initialized. This may give insight into the data structures passed to this function, and therefore, the entire context of operation. I will pay attention to any conditional calls or error handling surrounding it. * **The surrounding context:** Looking at the surrounding code, and understanding the surrounding functions and data structures. What is the overall purpose of those calling functions? How does the UART driver initialize UART ports? What are the implications of a port's addition/registration? This initial search gives me the "big picture", and then I will dive deeper into the code once I know where the interesting bits are. This is a very targeted approach to a very specific question; a well-known function is used for this specific purpose, so I am very much interested in the *context* in which this function is operating. |
| 38/2 | 2026/09/28 12:30 | tool | grepper |
0mArgs:{
"Expression": "uart_add_one_port\\(",
"PathPrefix": "drivers/tty/serial/serial_port.c"
}Results: {
"Output": "drivers/tty/serial/serial_port.c=129=static int serial_port_remove(struct device *dev)\n--\ndrivers/tty/serial/serial_port.c-140- */\ndrivers/tty/serial/serial_port.c:141:int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)\ndrivers/tty/serial/serial_port.c-142-{\n"
} |
| 39/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 19482 output: 39 thoughts: 27 Thoughts: Okay, here's my take on those thoughts, tailored for an expert audience: **Diving into `uart_add_one_port`** Alright, let's get down to brass tacks. Time to take a look at `uart_add_one_port` within the `drivers/tty/serial/serial_port.c` module. I need to refresh my understanding of the port addition sequence within the serial driver framework. I'm particularly interested in how the core structures are initialized and hooked into the system. Specifically, I want to see how the device node is created and managed, and how this relates to the overall device tree configuration. I'm anticipating that this function plays a crucial role in registering a newly discovered or configured UART port with the kernel, handling the intricacies of resource allocation, interrupt binding, and possibly power management initialization. Time to dig in and see how well my assumptions are realized. Let's see what the implementation truly reveals. |
| 40/2 | 2026/09/28 12:30 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/serial_port.c",
"FirstLine": 141,
"LineCount": 40
}Results: {
"Contents": " 141:\tint uart_add_one_port(struct uart_driver *drv, struct uart_port *port)\n 142:\t{\n 143:\t\treturn serial_ctrl_register_port(drv, port);\n 144:\t}\n 145:\tEXPORT_SYMBOL(uart_add_one_port);\n 146:\t\n 147:\tvoid uart_remove_one_port(struct uart_driver *drv, struct uart_port *port)\n 148:\t{\n 149:\t\tserial_ctrl_unregister_port(drv, port);\n 150:\t}\n 151:\tEXPORT_SYMBOL(uart_remove_one_port);\n 152:\t\n 153:\t/**\n 154:\t * __uart_read_properties - read firmware properties of the given UART port\n 155:\t * @port: corresponding port\n 156:\t * @use_defaults: apply defaults (when %true) or validate the values (when %false)\n 157:\t *\n 158:\t * The following device properties are supported:\n 159:\t * - clock-frequency (optional)\n 160:\t * - fifo-size (optional)\n 161:\t * - no-loopback-test (optional)\n 162:\t * - reg-shift (defaults may apply)\n 163:\t * - reg-offset (value may be validated)\n 164:\t * - reg-io-width (defaults may apply or value may be validated)\n 165:\t * - interrupts (OF only)\n 166:\t * - serial [alias ID] (OF only)\n 167:\t *\n 168:\t * If the port-\u003edev is of struct platform_device type the interrupt line\n 169:\t * will be retrieved via platform_get_irq() call against that device.\n 170:\t * Otherwise it will be assigned by fwnode_irq_get() call. In both cases\n 171:\t * the index 0 of the resource is used.\n 172:\t *\n 173:\t * The caller is responsible to initialize the following fields of the @port\n 174:\t * -\u003edev (must be valid)\n 175:\t * -\u003eflags\n 176:\t * -\u003eiobase\n 177:\t * -\u003emapbase\n 178:\t * -\u003emapsize\n 179:\t * -\u003eregshift (if @use_defaults is false)\n 180:\t * before calling this function. Alternatively the above mentioned fields\n"
} |
| 41/2 | 2026/09/28 12:30 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 20421 output: 32 thoughts: 40 Thoughts: Okay, let's break this down. **Investigating the `serial_ctrl_register_port` Function** Right, so I've encountered `serial_ctrl_register_port`. I need to figure out what it does, how it works, and likely, how it interacts with the broader system. The best first step here is to track down its definition. Where is it actually declared and implemented? Likely, it's going to be in something like `serial_base.c` or a similarly named file, probably within the serial driver or hardware abstraction layer. I'm going to dive into that file and get a feel for its role and what that port is registering. Knowing this context will set up my thinking. |
| 42/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "serial_ctrl_register_port",
"PathPrefix": "drivers/tty/serial"
}Results: {
"Output": "drivers/tty/serial/serial_base.h=45=void serial_base_port_device_remove(struct serial_port_device *port_dev);\ndrivers/tty/serial/serial_base.h-46-\ndrivers/tty/serial/serial_base.h:47:int serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port);\ndrivers/tty/serial/serial_base.h-48-void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port);\n--\ndrivers/tty/serial/serial_ctrl.c=28=static int serial_ctrl_remove(struct device *dev)\n--\ndrivers/tty/serial/serial_ctrl.c-38- */\ndrivers/tty/serial/serial_ctrl.c:39:int serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port)\ndrivers/tty/serial/serial_ctrl.c-40-{\n--\ndrivers/tty/serial/serial_port.c=141=int uart_add_one_port(struct uart_driver *drv, struct uart_port *port)\ndrivers/tty/serial/serial_port.c-142-{\ndrivers/tty/serial/serial_port.c:143:\treturn serial_ctrl_register_port(drv, port);\ndrivers/tty/serial/serial_port.c-144-}\n"
} |
| 43/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21002 output: 27 thoughts: 1179 Thoughts: **Analyzing the MAX3100's Accessibility for Fuzzing** Okay, let's break this down. First, the MAX3100. It's an SPI/Microwire-compatible UART with an I/O expander, a physical chip. The key question is whether it's emulated in QEMU. I need to figure out if QEMU, specifically on x86-64 (which is our target), provides any emulation of this chip or the SPI bus it connects to. I know QEMU emulates peripherals like PL011, 16550A, and imx serial ports, but are any of those on x86? No, in standard QEMU x86_64, there is no MAX3100. Can it even be reached in a standard virtualized environment like GCE or QEMU? Now, let's revisit the fuzzing guidelines. Point 2 gives the negative criteria. It says to return `WorthFuzzing=false` if the code falls strictly into the following: "Structurally unreachable hardware," specifically vendor-specific PCIe switches, SmartNICs, GPU drivers requiring physical ASICs, or code paths exclusive to architectures other than the target architecture. So, does the MAX3100 fall into that "structurally unreachable hardware" category? Can it be probed in QEMU? The guidelines mention that we should check if any SPI device can be probed in standard QEMU. Let's see: on x86_64 QEMU (using `qemu-system-x86_64`), what SPI controllers exist? Intel-SPI (ICH/PCH SPI flash controller) is present, but that's for BIOS SPI flash, definitely not the MAX3100. Does QEMU emulate any SPI controller on a standard PC i440fx / q35? No. Standard QEMU PC emulates IDE, AHCI, virtio, e1000, i8042, etc. There is no SPI master bus emulation with attached slave devices, and certainly not a MAX3100 UART. What about a USB-SPI bridge? Could a USB gadget or Raw Gadget emulate something like a ch341 USB-to-SPI bridge? If a USB raw gadget emulates ch341, it only instantiates an SPI device with modalias "spi-ch341a". Can userspace bind this "spi-ch341a" to the "max3100" driver via `driver_override`? Let's assume someone writes "max3100" to `/sys/bus/spi/devices/spi0.0/driver_override`. What happens then? I need to check the `max3100_probe` function. It reads the "clock-frequency" property, which is crucial. Specifically, it uses `device_property_read_u32(dev, "clock-frequency", &max3100s[i]->port.uartclk);`. If "clock-frequency" is not set, `device_property_read_u32` returns an error, and `max3100s[i]->port.uartclk` is zero (kzalloc'd). The comment explicitly states that `uart_add_one_port` will fail if the clock frequency is not set. We must check if `uart_add_one_port` fails if `uartclk` is zero. |
| 44/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "uartclk",
"PathPrefix": "drivers/tty/serial"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 2263 lines.\nUse more precise expression if possible.\n\ndrivers/tty/serial/21285.c=224=serial21285_set_termios(struct uart_port *port, struct ktermios *termios,\n--\ndrivers/tty/serial/21285.c-243-\t */\ndrivers/tty/serial/21285.c:244:\tbaud = uart_get_baud_rate(port, termios, old, 0, port-\u003euartclk/16); \ndrivers/tty/serial/21285.c-245-\tquot = uart_get_divisor(port, baud);\ndrivers/tty/serial/21285.c:246:\tb = port-\u003euartclk / (16 * quot);\ndrivers/tty/serial/21285.c-247-\ttty_termios_encode_baud_rate(termios, b, b);\n--\ndrivers/tty/serial/21285.c=340=static int serial21285_verify_port(struct uart_port *port, struct serial_struct *ser)\n--\ndrivers/tty/serial/21285.c-346-\t\tret = -EINVAL;\ndrivers/tty/serial/21285.c:347:\tif (ser-\u003ebaud_base != port-\u003euartclk / 16)\ndrivers/tty/serial/21285.c-348-\t\tret = -EINVAL;\n--\ndrivers/tty/serial/21285.c=379=static void serial21285_setup_ports(void)\ndrivers/tty/serial/21285.c-380-{\ndrivers/tty/serial/21285.c:381:\tserial21285_port.uartclk = mem_fclk_21285 / 4;\ndrivers/tty/serial/21285.c-382-}\n--\ndrivers/tty/serial/21285.c=400=serial21285_get_options(struct uart_port *port, int *baud,\n--\ndrivers/tty/serial/21285.c-430-\ndrivers/tty/serial/21285.c:431:\t\t*baud = port-\u003euartclk / (16 * (tmp + 1));\ndrivers/tty/serial/21285.c-432-\t}\n--\ndrivers/tty/serial/8250/8250.h=99=extern unsigned int nr_uarts;\n--\ndrivers/tty/serial/8250/8250.h-104-\t\t.irq\t\t= _irq,\t\t\t\t\\\ndrivers/tty/serial/8250/8250.h:105:\t\t.uartclk\t= 1843200,\t\t\t\\\ndrivers/tty/serial/8250/8250.h-106-\t\t.iotype\t\t= UPIO_PORT,\t\t\t\\\n--\ndrivers/tty/serial/8250/8250_acorn.c=25=struct serial_card_type {\ndrivers/tty/serial/8250/8250_acorn.c-26-\tunsigned int\tnum_ports;\ndrivers/tty/serial/8250/8250_acorn.c:27:\tunsigned int\tuartclk;\ndrivers/tty/serial/8250/8250_acorn.c-28-\tunsigned int\ttype;\n--\ndrivers/tty/serial/8250/8250_acorn.c=39=serial_card_probe(struct expansion_card *ec, const struct ecard_id *id)\n--\ndrivers/tty/serial/8250/8250_acorn.c-64-\tuart.port.flags\t= UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ;\ndrivers/tty/serial/8250/8250_acorn.c:65:\tuart.port.uartclk\t= type-\u003euartclk;\ndrivers/tty/serial/8250/8250_acorn.c-66-\tuart.port.iotype\t= UPIO_MEM;\n--\ndrivers/tty/serial/8250/8250_acorn.c=94=static struct serial_card_type atomwide_type = {\ndrivers/tty/serial/8250/8250_acorn.c-95-\t.num_ports\t= 3,\ndrivers/tty/serial/8250/8250_acorn.c:96:\t.uartclk\t= 7372800,\ndrivers/tty/serial/8250/8250_acorn.c-97-\t.type\t\t= ECARD_RES_IOCSLOW,\n--\ndrivers/tty/serial/8250/8250_acorn.c=101=static struct serial_card_type serport_type = {\ndrivers/tty/serial/8250/8250_acorn.c-102-\t.num_ports\t= 2,\ndrivers/tty/serial/8250/8250_acorn.c:103:\t.uartclk\t= 3686400,\ndrivers/tty/serial/8250/8250_acorn.c-104-\t.type\t\t= ECARD_RES_IOCSLOW,\n--\ndrivers/tty/serial/8250/8250_aspeed_vuart.c=415=static int aspeed_vuart_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-463-\t/* Get clk rate through clk driver if present */\ndrivers/tty/serial/8250/8250_aspeed_vuart.c:464:\tif (!port.port.uartclk) {\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-465-\t\tvclk = devm_clk_get_enabled(dev, NULL);\n--\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-470-\ndrivers/tty/serial/8250/8250_aspeed_vuart.c:471:\t\tport.port.uartclk = clk_get_rate(vclk);\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-472-\t}\n--\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-475-\tif (of_property_read_u32(np, \"current-speed\", \u0026prop) == 0)\ndrivers/tty/serial/8250/8250_aspeed_vuart.c:476:\t\tport.port.custom_divisor = port.port.uartclk / (16 * prop);\ndrivers/tty/serial/8250/8250_aspeed_vuart.c-477-\n--\ndrivers/tty/serial/8250/8250_bcm2835aux.c-38- * struct bcm2835aux_data - driver private data of BCM2835 auxiliary UART\ndrivers/tty/serial/8250/8250_bcm2835aux.c:39: * @clk: clock producer of the port's uartclk\ndrivers/tty/serial/8250/8250_bcm2835aux.c-40- * @line: index of the port's serial8250_ports[] entry\n--\ndrivers/tty/serial/8250/8250_bcm2835aux.c=83=static int bcm2835aux_serial_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_bcm2835aux.c-88-\tstruct resource *res;\ndrivers/tty/serial/8250/8250_bcm2835aux.c:89:\tunsigned int uartclk;\ndrivers/tty/serial/8250/8250_bcm2835aux.c-90-\tint ret;\n--\ndrivers/tty/serial/8250/8250_bcm2835aux.c-147-\ndrivers/tty/serial/8250/8250_bcm2835aux.c:148:\tuartclk = clk_get_rate(data-\u003eclk);\ndrivers/tty/serial/8250/8250_bcm2835aux.c:149:\tif (uartclk)\ndrivers/tty/serial/8250/8250_bcm2835aux.c:150:\t\tup.port.uartclk = uartclk;\ndrivers/tty/serial/8250/8250_bcm2835aux.c-151-\n--\ndrivers/tty/serial/8250/8250_bcm2835aux.c-156-\t */\ndrivers/tty/serial/8250/8250_bcm2835aux.c:157:\tup.port.uartclk *= 2;\ndrivers/tty/serial/8250/8250_bcm2835aux.c-158-\n--\ndrivers/tty/serial/8250/8250_bcm7271.c=707=static void set_clock_mux(struct uart_port *up, struct brcmuart_priv *priv,\n--\ndrivers/tty/serial/8250/8250_bcm7271.c-770-\ndrivers/tty/serial/8250/8250_bcm7271.c:771:\tup-\u003euartclk = best_freq;\ndrivers/tty/serial/8250/8250_bcm7271.c-772-}\n--\ndrivers/tty/serial/8250/8250_bcm7271.c=952=static int brcmuart_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_bcm7271.c-1052-\t\tinit_real_clk_rates(dev, priv);\ndrivers/tty/serial/8250/8250_bcm7271.c:1053:\t\tup.port.uartclk = priv-\u003edefault_mux_rate;\ndrivers/tty/serial/8250/8250_bcm7271.c-1054-\t} else {\n--\ndrivers/tty/serial/8250/8250_ce4100.c=62=static void ce4100_serial_fixup(int port, struct uart_port *up, u32 *capabilities)\n--\ndrivers/tty/serial/8250/8250_ce4100.c-70-\tif (up-\u003eiotype != UPIO_MEM32) {\ndrivers/tty/serial/8250/8250_ce4100.c:71:\t\tup-\u003euartclk = 14745600;\ndrivers/tty/serial/8250/8250_ce4100.c-72-\t\tup-\u003emapbase = 0xdffe0200;\n--\ndrivers/tty/serial/8250/8250_core.c=540=int __init early_serial_setup(struct uart_port *port)\n--\ndrivers/tty/serial/8250/8250_core.c-552-\tp-\u003eirqflags = port-\u003eirqflags;\ndrivers/tty/serial/8250/8250_core.c:553:\tp-\u003euartclk = port-\u003euartclk;\ndrivers/tty/serial/8250/8250_core.c-554-\tp-\u003efifosize = port-\u003efifosize;\n--\ndrivers/tty/serial/8250/8250_core.c=606=void serial8250_resume_port(int line)\n--\ndrivers/tty/serial/8250/8250_core.c-619-\t\tserial_port_out(port, UART_LCR, 0);\ndrivers/tty/serial/8250/8250_core.c:620:\t\tport-\u003euartclk = 921600*16;\ndrivers/tty/serial/8250/8250_core.c-621-\t}\n--\ndrivers/tty/serial/8250/8250_core.c=693=int serial8250_register_8250_port(const struct uart_8250_port *up)\n--\ndrivers/tty/serial/8250/8250_core.c-698-\ndrivers/tty/serial/8250/8250_core.c:699:\tif (up-\u003eport.uartclk == 0)\ndrivers/tty/serial/8250/8250_core.c-700-\t\treturn -EINVAL;\n--\ndrivers/tty/serial/8250/8250_core.c-731-\tuart-\u003eport.irqflags = up-\u003eport.irqflags;\ndrivers/tty/serial/8250/8250_core.c:732:\tuart-\u003eport.uartclk = up-\u003eport.uartclk;\ndrivers/tty/serial/8250/8250_core.c-733-\tuart-\u003eport.fifosize = up-\u003eport.fifosize;\n--\ndrivers/tty/serial/8250/8250_dfl.c=51=static int dfl_uart_get_params(struct dfl_device *dfl_dev, struct uart_8250_port *uart)\n--\ndrivers/tty/serial/8250/8250_dfl.c-61-\ndrivers/tty/serial/8250/8250_dfl.c:62:\tuart-\u003eport.uartclk = clk_freq;\ndrivers/tty/serial/8250/8250_dfl.c-63-\n--\ndrivers/tty/serial/8250/8250_dw.c=473=static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,\n--\ndrivers/tty/serial/8250/8250_dw.c-485-\t\tif (!ret)\ndrivers/tty/serial/8250/8250_dw.c:486:\t\t\tp-\u003euartclk = rate;\ndrivers/tty/serial/8250/8250_dw.c-487-\t}\n--\ndrivers/tty/serial/8250/8250_dw.c=624=static int dw8250_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_dw.c-716-\tif (data-\u003eclk)\ndrivers/tty/serial/8250/8250_dw.c:717:\t\tp-\u003euartclk = clk_get_rate(data-\u003eclk);\ndrivers/tty/serial/8250/8250_dw.c-718-\ndrivers/tty/serial/8250/8250_dw.c-719-\t/* If no clock rate is defined, fail. */\ndrivers/tty/serial/8250/8250_dw.c:720:\tif (!p-\u003euartclk)\ndrivers/tty/serial/8250/8250_dw.c-721-\t\treturn dev_err_probe(dev, -EINVAL, \"clock rate not defined\\n\");\n--\ndrivers/tty/serial/8250/8250_dwlib.c=26=static unsigned int dw8250_get_divisor(struct uart_port *p, unsigned int baud,\n--\ndrivers/tty/serial/8250/8250_dwlib.c-31-\ndrivers/tty/serial/8250/8250_dwlib.c:32:\tquot = p-\u003euartclk / base_baud;\ndrivers/tty/serial/8250/8250_dwlib.c:33:\trem = p-\u003euartclk % base_baud;\ndrivers/tty/serial/8250/8250_dwlib.c-34-\t*frac = DIV_ROUND_CLOSEST(rem \u003c\u003c d-\u003edlf_size, base_baud);\n--\ndrivers/tty/serial/8250/8250_early.c=130=static void __init init_port(struct earlycon_device *device)\n--\ndrivers/tty/serial/8250/8250_early.c-142-\ndrivers/tty/serial/8250/8250_early.c:143:\tif (port-\u003euartclk) {\ndrivers/tty/serial/8250/8250_early.c:144:\t\tdivisor = DIV_ROUND_CLOSEST(port-\u003euartclk, 16 * device-\u003ebaud);\ndrivers/tty/serial/8250/8250_early.c-145-\t\tc = serial8250_early_in(port, UART_LCR);\n--\ndrivers/tty/serial/8250/8250_em.c=152=static int serial8250_em_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_em.c-184-\ndrivers/tty/serial/8250/8250_em.c:185:\tup.port.uartclk = clk_get_rate(sclk);\ndrivers/tty/serial/8250/8250_em.c-186-\n--\ndrivers/tty/serial/8250/8250_exar.c=437=static unsigned int xr17v35x_get_divisor(struct uart_port *p, unsigned int baud,\n--\ndrivers/tty/serial/8250/8250_exar.c-441-\ndrivers/tty/serial/8250/8250_exar.c:442:\tquot_16 = DIV_ROUND_CLOSEST(p-\u003euartclk, baud);\ndrivers/tty/serial/8250/8250_exar.c-443-\t*frac = quot_16 \u0026 0x0f;\n--\ndrivers/tty/serial/8250/8250_exar.c=538=pci_fastcom335_setup(struct exar8250 *priv, struct pci_dev *pcidev,\n--\ndrivers/tty/serial/8250/8250_exar.c-545-\ndrivers/tty/serial/8250/8250_exar.c:546:\tport-\u003eport.uartclk = baud * 16;\ndrivers/tty/serial/8250/8250_exar.c-547-\n--\ndrivers/tty/serial/8250/8250_exar.c=826=static int cti_port_setup_common(struct exar8250 *priv,\n--\ndrivers/tty/serial/8250/8250_exar.c-833-\tport-\u003eport.port_id = idx;\ndrivers/tty/serial/8250/8250_exar.c:834:\tport-\u003eport.uartclk = priv-\u003eosc_freq;\ndrivers/tty/serial/8250/8250_exar.c-835-\n--\ndrivers/tty/serial/8250/8250_exar.c=1098=pci_xr17c154_setup(struct exar8250 *priv, struct pci_dev *pcidev,\n--\ndrivers/tty/serial/8250/8250_exar.c-1103-\ndrivers/tty/serial/8250/8250_exar.c:1104:\tport-\u003eport.uartclk = baud * 16;\ndrivers/tty/serial/8250/8250_exar.c-1105-\treturn default_setup(priv, pcidev, idx, offset, port);\n--\ndrivers/tty/serial/8250/8250_exar.c=1339=pci_xr17v35x_setup(struct exar8250 *priv, struct pci_dev *pcidev,\n--\ndrivers/tty/serial/8250/8250_exar.c-1347-\ndrivers/tty/serial/8250/8250_exar.c:1348:\tport-\u003eport.uartclk = baud * 16;\ndrivers/tty/serial/8250/8250_exar.c-1349-\tport-\u003eport.rs485_config = platform-\u003ers485_config;\n--\ndrivers/tty/serial/8250/8250_exar.c-1359-\tif (idx \u003e= 8)\ndrivers/tty/serial/8250/8250_exar.c:1360:\t\tport-\u003eport.uartclk /= 2;\ndrivers/tty/serial/8250/8250_exar.c-1361-\n--\ndrivers/tty/serial/8250/8250_fintek.c=289=static void fintek_8250_set_termios(struct uart_port *port,\n--\ndrivers/tty/serial/8250/8250_fintek.c-330-\ndrivers/tty/serial/8250/8250_fintek.c:331:\t\tif (port-\u003euartclk == baudrate_table[i] * 16)\ndrivers/tty/serial/8250/8250_fintek.c-332-\t\t\tbreak;\n--\ndrivers/tty/serial/8250/8250_fintek.c-336-\ndrivers/tty/serial/8250/8250_fintek.c:337:\t\tport-\u003euartclk = baudrate_table[i] * 16;\ndrivers/tty/serial/8250/8250_fintek.c-338-\n--\ndrivers/tty/serial/8250/8250_fsl.c=106=static int fsl8250_acpi_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_fsl.c-127-\tret = device_property_read_u32(dev, \"clock-frequency\",\ndrivers/tty/serial/8250/8250_fsl.c:128:\t\t\t\t\t\u0026port8250.port.uartclk);\ndrivers/tty/serial/8250/8250_fsl.c-129-\tif (ret)\n--\ndrivers/tty/serial/8250/8250_hp300.c=91=int __init hp300_setup_serial_console(void)\n--\ndrivers/tty/serial/8250/8250_hp300.c-115-\ndrivers/tty/serial/8250/8250_hp300.c:116:\t\tport.uartclk = HPAPCI_BAUD_BASE * 16;\ndrivers/tty/serial/8250/8250_hp300.c-117-\t\tport.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));\n--\ndrivers/tty/serial/8250/8250_hp300.c-132-\ndrivers/tty/serial/8250/8250_hp300.c:133:\t\tport.uartclk = HPDCA_BAUD_BASE * 16;\ndrivers/tty/serial/8250/8250_hp300.c-134-\t\tport.mapbase = (pa + UART_OFFSET);\n--\ndrivers/tty/serial/8250/8250_hp300.c=157=static int hpdca_init_one(struct dio_dev *d,\n--\ndrivers/tty/serial/8250/8250_hp300.c-174-\tuart.port.irq = d-\u003eipl;\ndrivers/tty/serial/8250/8250_hp300.c:175:\tuart.port.uartclk = HPDCA_BAUD_BASE * 16;\ndrivers/tty/serial/8250/8250_hp300.c-176-\tuart.port.mapbase = (d-\u003eresource.start + UART_OFFSET);\n--\ndrivers/tty/serial/8250/8250_hp300.c=203=static int __init hp300_8250_init(void)\n--\ndrivers/tty/serial/8250/8250_hp300.c-256-\t\tuart.port.irq = 0;\ndrivers/tty/serial/8250/8250_hp300.c:257:\t\tuart.port.uartclk = HPAPCI_BAUD_BASE * 16;\ndrivers/tty/serial/8250/8250_hp300.c-258-\t\tuart.port.mapbase = base;\n--\ndrivers/tty/serial/8250/8250_hub6.c-13-\t\t.irq\t\t= 3,\t\t\t\t\t\\\ndrivers/tty/serial/8250/8250_hub6.c:14:\t\t.uartclk\t= 1843200,\t\t\t\t\\\ndrivers/tty/serial/8250/8250_hub6.c-15-\t\t.iotype\t\t= UPIO_HUB6,\t\t\t\t\\\n--\ndrivers/tty/serial/8250/8250_ingenic.c=72=static void __init ingenic_early_console_setup_clock(struct earlycon_device *dev)\n--\ndrivers/tty/serial/8250/8250_ingenic.c-85-\ndrivers/tty/serial/8250/8250_ingenic.c:86:\tdev-\u003eport.uartclk = be32_to_cpup(prop);\ndrivers/tty/serial/8250/8250_ingenic.c-87-}\n--\ndrivers/tty/serial/8250/8250_ingenic.c=89=static int __init ingenic_earlycon_setup_tail(struct earlycon_device *dev,\n--\ndrivers/tty/serial/8250/8250_ingenic.c-106-\t\tbaud = dev-\u003ebaud;\ndrivers/tty/serial/8250/8250_ingenic.c:107:\tdivisor = DIV_ROUND_CLOSEST(port-\u003euartclk, 16 * baud);\ndrivers/tty/serial/8250/8250_ingenic.c-108-\n--\ndrivers/tty/serial/8250/8250_ingenic.c=137=static int __init jz4750_early_console_setup(struct earlycon_device *dev,\n--\ndrivers/tty/serial/8250/8250_ingenic.c-146-\tingenic_early_console_setup_clock(dev);\ndrivers/tty/serial/8250/8250_ingenic.c:147:\tif (dev-\u003eport.uartclk \u003e= 16000000)\ndrivers/tty/serial/8250/8250_ingenic.c:148:\t\tdev-\u003eport.uartclk /= 2;\ndrivers/tty/serial/8250/8250_ingenic.c-149-\n--\ndrivers/tty/serial/8250/8250_ingenic.c=231=static int ingenic_uart_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_ingenic.c-297-\t}\ndrivers/tty/serial/8250/8250_ingenic.c:298:\tuart.port.uartclk = clk_get_rate(data-\u003eclk_baud);\ndrivers/tty/serial/8250/8250_ingenic.c-299-\n--\ndrivers/tty/serial/8250/8250_ioc3.c=34=static int serial8250_ioc3_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_ioc3.c-60-\tup.port.iotype = UPIO_MEM;\ndrivers/tty/serial/8250/8250_ioc3.c:61:\tup.port.uartclk = IOC3_UARTCLK;\ndrivers/tty/serial/8250/8250_ioc3.c-62-\tup.port.type = PORT_16550A;\n--\ndrivers/tty/serial/8250/8250_keba.c=170=static int kuart_probe(struct auxiliary_device *auxdev,\n--\ndrivers/tty/serial/8250/8250_keba.c-210-\tuart.port.irq = kuart-\u003eauxdev-\u003eirq;\ndrivers/tty/serial/8250/8250_keba.c:211:\tuart.port.uartclk = KUART_CLK;\ndrivers/tty/serial/8250/8250_keba.c-212-\tuart.port.private_data = kuart;\n--\ndrivers/tty/serial/8250/8250_loongson.c=85=static unsigned int loongson_frac_get_divisor(struct uart_port *port, unsigned int baud,\n--\ndrivers/tty/serial/8250/8250_loongson.c-89-\ndrivers/tty/serial/8250/8250_loongson.c:90:\tquot = DIV_ROUND_CLOSEST((port-\u003euartclk \u003c\u003c 4), baud);\ndrivers/tty/serial/8250/8250_loongson.c-91-\t*frac = FIELD_GET(LOONGSON_QUOT_FRAC_MASK, quot);\n--\ndrivers/tty/serial/8250/8250_loongson.c=106=static int loongson_uart_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_loongson.c-146-\ndrivers/tty/serial/8250/8250_loongson.c:147:\tif (!port-\u003euartclk) {\ndrivers/tty/serial/8250/8250_loongson.c-148-\t\tpriv-\u003eclk = devm_clk_get_enabled(dev, NULL);\n--\ndrivers/tty/serial/8250/8250_loongson.c-151-\t\t\t\t\t \"Unable to determine clock frequency!\\n\");\ndrivers/tty/serial/8250/8250_loongson.c:152:\t\tport-\u003euartclk = clk_get_rate(priv-\u003eclk);\ndrivers/tty/serial/8250/8250_loongson.c-153-\t}\n--\ndrivers/tty/serial/8250/8250_lpc18xx.c=35=static int lpc18xx_rs485_config(struct uart_port *port, struct ktermios *termios,\n--\ndrivers/tty/serial/8250/8250_lpc18xx.c-51-\tif (rs485-\u003edelay_rts_after_send) {\ndrivers/tty/serial/8250/8250_lpc18xx.c:52:\t\tbaud_clk = port-\u003euartclk / up-\u003edl_read(up);\ndrivers/tty/serial/8250/8250_lpc18xx.c-53-\t\trs485_dly_reg = DIV_ROUND_UP(rs485-\u003edelay_rts_after_send\n--\ndrivers/tty/serial/8250/8250_lpc18xx.c=90=static int lpc18xx_serial_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_lpc18xx.c-113-\ndrivers/tty/serial/8250/8250_lpc18xx.c:114:\tdata-\u003eclk_uart = devm_clk_get(\u0026pdev-\u003edev, \"uartclk\");\ndrivers/tty/serial/8250/8250_lpc18xx.c-115-\tif (IS_ERR(data-\u003eclk_uart)) {\n--\ndrivers/tty/serial/8250/8250_lpc18xx.c-145-\tuart.port.flags = UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_SKIP_TEST;\ndrivers/tty/serial/8250/8250_lpc18xx.c:146:\tuart.port.uartclk = clk_get_rate(data-\u003eclk_uart);\ndrivers/tty/serial/8250/8250_lpc18xx.c-147-\tuart.port.private_data = data;\n--\ndrivers/tty/serial/8250/8250_lpss.c=72=static void byt_set_termios(struct uart_port *p, struct ktermios *termios,\n--\ndrivers/tty/serial/8250/8250_lpss.c-91-\t *\ndrivers/tty/serial/8250/8250_lpss.c:92:\t * uartclk = (m / n) * 100 MHz, where m \u003c= n\ndrivers/tty/serial/8250/8250_lpss.c-93-\t */\ndrivers/tty/serial/8250/8250_lpss.c-94-\trational_best_approximation(fuart, fref, w, w, \u0026m, \u0026n);\ndrivers/tty/serial/8250/8250_lpss.c:95:\tp-\u003euartclk = fuart;\ndrivers/tty/serial/8250/8250_lpss.c-96-\n--\ndrivers/tty/serial/8250/8250_lpss.c=311=static int lpss8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)\n--\ndrivers/tty/serial/8250/8250_lpss.c-340-\tuart.port.regshift = 2;\ndrivers/tty/serial/8250/8250_lpss.c:341:\tuart.port.uartclk = lpss-\u003eboard-\u003ebase_baud * 16;\ndrivers/tty/serial/8250/8250_lpss.c-342-\tuart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;\n--\ndrivers/tty/serial/8250/8250_men_mcb.c=43=struct serial_8250_men_mcb_data {\n--\ndrivers/tty/serial/8250/8250_men_mcb.c-54- */\ndrivers/tty/serial/8250/8250_men_mcb.c:55:static u32 men_lookup_uartclk(struct mcb_device *mdev)\ndrivers/tty/serial/8250/8250_men_mcb.c-56-{\n--\ndrivers/tty/serial/8250/8250_men_mcb.c-72-\t\tdev_info(\u0026mdev-\u003edev,\ndrivers/tty/serial/8250/8250_men_mcb.c:73:\t\t\t \"board not detected, using default uartclk\\n\");\ndrivers/tty/serial/8250/8250_men_mcb.c-74-\n--\ndrivers/tty/serial/8250/8250_men_mcb.c=178=static int serial_8250_men_mcb_probe(struct mcb_device *mdev,\n--\ndrivers/tty/serial/8250/8250_men_mcb.c-214-\t\tuart.port.iotype = UPIO_MEM;\ndrivers/tty/serial/8250/8250_men_mcb.c:215:\t\tuart.port.uartclk = men_lookup_uartclk(mdev);\ndrivers/tty/serial/8250/8250_men_mcb.c-216-\t\tuart.port.irq = mcb_get_irq(mdev);\n--\ndrivers/tty/serial/8250/8250_mid.c=207=static void mid8250_set_termios(struct uart_port *p, struct ktermios *termios,\n--\ndrivers/tty/serial/8250/8250_mid.c-232-\trational_best_approximation(fuart, mid-\u003eboard-\u003efreq, w, w, \u0026mul, \u0026div);\ndrivers/tty/serial/8250/8250_mid.c:233:\tp-\u003euartclk = fuart * 16 / ps;\t\t/* core uses ps = 16 always */\ndrivers/tty/serial/8250/8250_mid.c-234-\n--\ndrivers/tty/serial/8250/8250_mid.c=288=static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)\n--\ndrivers/tty/serial/8250/8250_mid.c-310-\tuart.port.iotype = UPIO_MEM;\ndrivers/tty/serial/8250/8250_mid.c:311:\tuart.port.uartclk = mid-\u003eboard-\u003ebase_baud * 16;\ndrivers/tty/serial/8250/8250_mid.c-312-\tuart.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE;\n--\ndrivers/tty/serial/8250/8250_mtk.c=307=mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,\n--\ndrivers/tty/serial/8250/8250_mtk.c-334-\t * set_termios method. Standard 8250 port expects bauds to be\ndrivers/tty/serial/8250/8250_mtk.c:335:\t * no higher than (uartclk / 16) so the baud will be clamped if it\ndrivers/tty/serial/8250/8250_mtk.c-336-\t * gets out of that bound. Mediatek 8250 port supports speed\n--\ndrivers/tty/serial/8250/8250_mtk.c-360-\tbaud = uart_get_baud_rate(port, termios, old,\ndrivers/tty/serial/8250/8250_mtk.c:361:\t\t\t\t port-\u003euartclk / 16 / UART_DIV_MAX,\ndrivers/tty/serial/8250/8250_mtk.c:362:\t\t\t\t port-\u003euartclk);\ndrivers/tty/serial/8250/8250_mtk.c-363-\n--\ndrivers/tty/serial/8250/8250_mtk.c-368-\t\tserial_port_out(port, MTK_UART_HIGHS, 0x3);\ndrivers/tty/serial/8250/8250_mtk.c:369:\t\tquot = DIV_ROUND_UP(port-\u003euartclk, 256 * baud);\ndrivers/tty/serial/8250/8250_mtk.c-370-\t}\n--\ndrivers/tty/serial/8250/8250_mtk.c-392-\ndrivers/tty/serial/8250/8250_mtk.c:393:\t\ttmp = (port-\u003euartclk / (baud * quot)) - 1;\ndrivers/tty/serial/8250/8250_mtk.c-394-\t\tserial_port_out(port, MTK_UART_SAMPLE_COUNT, tmp);\n--\ndrivers/tty/serial/8250/8250_mtk.c-398-\t\t/*count fraction to set fractoin register */\ndrivers/tty/serial/8250/8250_mtk.c:399:\t\tfraction = ((port-\u003euartclk * 100) / baud / quot) % 100;\ndrivers/tty/serial/8250/8250_mtk.c-400-\t\tfraction = DIV_ROUND_CLOSEST(fraction, 10);\n--\ndrivers/tty/serial/8250/8250_mtk.c=519=static int mtk8250_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_mtk.c-568-\tuart.port.set_termios = mtk8250_set_termios;\ndrivers/tty/serial/8250/8250_mtk.c:569:\tuart.port.uartclk = clk_get_rate(data-\u003euart_clk);\ndrivers/tty/serial/8250/8250_mtk.c:570:\tif (!uart.port.uartclk)\ndrivers/tty/serial/8250/8250_mtk.c:571:\t\tuart.port.uartclk = 26 * HZ_PER_MHZ;\ndrivers/tty/serial/8250/8250_mtk.c-572-#ifdef CONFIG_SERIAL_8250_DMA\n--\ndrivers/tty/serial/8250/8250_ni.c=69=struct ni16550_device_info {\ndrivers/tty/serial/8250/8250_ni.c:70:\tu32 uartclk;\ndrivers/tty/serial/8250/8250_ni.c-71-\tu8 prescaler;\n--\ndrivers/tty/serial/8250/8250_ni.c=275=static int ni16550_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_ni.c-330-\t */\ndrivers/tty/serial/8250/8250_ni.c:331:\tuart-\u003eport.uartclk = info-\u003euartclk;\ndrivers/tty/serial/8250/8250_ni.c-332-\n--\ndrivers/tty/serial/8250/8250_ni.c-336-\ndrivers/tty/serial/8250/8250_ni.c:337:\tif (!uart-\u003eport.uartclk) {\ndrivers/tty/serial/8250/8250_ni.c-338-\t\tdata-\u003eclk = devm_clk_get_enabled(dev, NULL);\ndrivers/tty/serial/8250/8250_ni.c-339-\t\tif (!IS_ERR(data-\u003eclk))\ndrivers/tty/serial/8250/8250_ni.c:340:\t\t\tuart-\u003eport.uartclk = clk_get_rate(data-\u003eclk);\ndrivers/tty/serial/8250/8250_ni.c-341-\t}\ndrivers/tty/serial/8250/8250_ni.c-342-\ndrivers/tty/serial/8250/8250_ni.c:343:\tif (!uart-\u003eport.uartclk)\ndrivers/tty/serial/8250/8250_ni.c-344-\t\treturn dev_err_probe(dev, -ENODEV, \"unable to determine clock frequency!\\n\");\n--\ndrivers/tty/serial/8250/8250_ni.c=403=static const struct ni16550_device_info nic7750 = {\ndrivers/tty/serial/8250/8250_ni.c:404:\t.uartclk = 33333333,\ndrivers/tty/serial/8250/8250_ni.c-405-};\n--\ndrivers/tty/serial/8250/8250_ni.c=408=static const struct ni16550_device_info nic7772 = {\ndrivers/tty/serial/8250/8250_ni.c:409:\t.uartclk = 1843200,\ndrivers/tty/serial/8250/8250_ni.c-410-\t.flags = NI_HAS_PMR,\n--\ndrivers/tty/serial/8250/8250_ni.c=414=static const struct ni16550_device_info nic792b = {\ndrivers/tty/serial/8250/8250_ni.c-415-\t/* Sets UART clock rate to 22.222 MHz with 1.125 prescale */\ndrivers/tty/serial/8250/8250_ni.c:416:\t.uartclk = 22222222,\ndrivers/tty/serial/8250/8250_ni.c-417-\t.prescaler = 0x09,\n--\ndrivers/tty/serial/8250/8250_ni.c=421=static const struct ni16550_device_info nic7a69 = {\ndrivers/tty/serial/8250/8250_ni.c-422-\t/* Set UART clock rate to 29.629 MHz with 1.125 prescale */\ndrivers/tty/serial/8250/8250_ni.c:423:\t.uartclk = 29629629,\ndrivers/tty/serial/8250/8250_ni.c-424-\t.prescaler = 0x09,\n--\ndrivers/tty/serial/8250/8250_of.c=51=static unsigned int npcm_get_divisor(struct uart_port *port, unsigned int baud,\n--\ndrivers/tty/serial/8250/8250_of.c-53-{\ndrivers/tty/serial/8250/8250_of.c:54:\treturn DIV_ROUND_CLOSEST(port-\u003euartclk, 16 * baud + 2) - 2;\ndrivers/tty/serial/8250/8250_of.c-55-}\n--\ndrivers/tty/serial/8250/8250_of.c=69=static int of_platform_serial_clk_notifier_cb(struct notifier_block *nb, unsigned long event,\n--\ndrivers/tty/serial/8250/8250_of.c-76-\tif (event == POST_RATE_CHANGE) {\ndrivers/tty/serial/8250/8250_of.c:77:\t\tserial8250_update_uartclk(\u0026port8250-\u003eport, ndata-\u003enew_rate);\ndrivers/tty/serial/8250/8250_of.c-78-\t\treturn NOTIFY_OK;\n--\ndrivers/tty/serial/8250/8250_of.c=87=static int of_platform_serial_setup(struct platform_device *ofdev,\n--\ndrivers/tty/serial/8250/8250_of.c-125-\t/* Get clk rate through clk driver if present */\ndrivers/tty/serial/8250/8250_of.c:126:\tif (!port-\u003euartclk) {\ndrivers/tty/serial/8250/8250_of.c-127-\t\tstruct clk *bus_clk;\n--\ndrivers/tty/serial/8250/8250_of.c-142-\t\tinfo-\u003ebus_clk = bus_clk;\ndrivers/tty/serial/8250/8250_of.c:143:\t\tport-\u003euartclk = clk_get_rate(info-\u003eclk);\ndrivers/tty/serial/8250/8250_of.c-144-\t}\n--\ndrivers/tty/serial/8250/8250_of.c-146-\tif (of_property_read_u32(np, \"current-speed\", \u0026spd) == 0)\ndrivers/tty/serial/8250/8250_of.c:147:\t\tport-\u003ecustom_divisor = port-\u003euartclk / (16 * spd);\ndrivers/tty/serial/8250/8250_of.c-148-\n--\ndrivers/tty/serial/8250/8250_omap.c=239=static void omap_8250_get_divisor(struct uart_port *port, unsigned int baud,\n--\ndrivers/tty/serial/8250/8250_omap.c-241-{\ndrivers/tty/serial/8250/8250_omap.c:242:\tunsigned int uartclk = port-\u003euartclk;\ndrivers/tty/serial/8250/8250_omap.c-243-\tunsigned int div_13, div_16;\n--\ndrivers/tty/serial/8250/8250_omap.c-245-\ndrivers/tty/serial/8250/8250_omap.c:246:\tdiv_13 = DIV_ROUND_CLOSEST(uartclk, 13 * baud);\ndrivers/tty/serial/8250/8250_omap.c:247:\tdiv_16 = DIV_ROUND_CLOSEST(uartclk, 16 * baud);\ndrivers/tty/serial/8250/8250_omap.c-248-\n--\ndrivers/tty/serial/8250/8250_omap.c-253-\ndrivers/tty/serial/8250/8250_omap.c:254:\tabs_d13 = abs(baud - uartclk / 13 / div_13);\ndrivers/tty/serial/8250/8250_omap.c:255:\tabs_d16 = abs(baud - uartclk / 16 / div_16);\ndrivers/tty/serial/8250/8250_omap.c-256-\n--\ndrivers/tty/serial/8250/8250_omap.c=502=static void omap_8250_set_termios(struct uart_port *port,\n--\ndrivers/tty/serial/8250/8250_omap.c-512-\tbaud = uart_get_baud_rate(port, termios, old,\ndrivers/tty/serial/8250/8250_omap.c:513:\t\t\t\t port-\u003euartclk / 16 / UART_DIV_MAX,\ndrivers/tty/serial/8250/8250_omap.c:514:\t\t\t\t port-\u003euartclk / 13);\ndrivers/tty/serial/8250/8250_omap.c-515-\n--\ndrivers/tty/serial/8250/8250_omap.c=830=static int omap8250_rs485_config(struct uart_port *port,\n--\ndrivers/tty/serial/8250/8250_omap.c-850-\t\tif (priv-\u003emdr1 == UART_OMAP_MDR1_16X_MODE)\ndrivers/tty/serial/8250/8250_omap.c:851:\t\t\tbaud = port-\u003euartclk / (16 * priv-\u003equot);\ndrivers/tty/serial/8250/8250_omap.c-852-\t\telse\ndrivers/tty/serial/8250/8250_omap.c:853:\t\t\tbaud = port-\u003euartclk / (13 * priv-\u003equot);\ndrivers/tty/serial/8250/8250_omap.c-854-\n--\ndrivers/tty/serial/8250/8250_omap.c=1414=static int omap8250_probe(struct platform_device *pdev)\n--\ndrivers/tty/serial/8250/8250_omap.c-1486-\ndrivers/tty/serial/8250/8250_omap.c:1487:\tif (!up.port.uartclk) {\ndrivers/tty/serial/8250/8250_omap.c-1488-\t\tstruct clk *clk;\n--\ndrivers/tty/serial/8250/8250_omap.c-1494-\t\t} else {\ndrivers/tty/serial/8250/8250_omap.c:1495:\t\t\tup.port.uartclk = clk_get_rate(clk);\ndrivers/tty/serial/8250/8250_omap.c-1496-\t\t}\n--\ndrivers/tty/serial/8250/8250_omap.c-1506-\ndrivers/tty/serial/8250/8250_omap.c:1507:\tif (!up.port.uartclk) {\ndrivers/tty/serial/8250/8250_omap.c:1508:\t\tup.port.uartclk = DEFAULT_CLK_SPEED;\ndrivers/tty/serial/8250/8250_omap.c-1509-\t\tdev_warn(\u0026pdev-\u003edev,\n--\ndrivers/tty/serial/8250/8250_parisc.c=23=static int __init serial_init_chip(struct parisc_device *dev)\n--\ndrivers/tty/serial/8250/8250_parisc.c-54-\t/* 7.272727MHz on Lasi. Assumed the same for Dino, Wax and Timi. */\ndrivers/tty/serial/8250/8250_parisc.c:55:\tuart.port.uartclk\t= (dev-\u003eid.sversion != 0xad) ?\n\n"
} |
| 45/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 37282 output: 38 thoughts: 71 Thoughts: Here's my summary, as though I'm processing the code: **Diving into Serial Port Initialization** Alright, let's zero in on this serial port initialization. I'm looking at `serial_core.c`, specifically line 2493. Hmm, it's calling something with `address`, `port->irq`, `port->uartclk / 16`, and the output of `uart_type(port)`. Interesting. That looks like the call to actually register the port. Now, let me see... I need to figure out what's happening during that call. Let me check the definition of that function, `serial_ctrl_register_port`. I need to figure out what that's doing. |
| 46/2 | 2026/09/28 12:31 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/serial_ctrl.c",
"FirstLine": 35,
"LineCount": 45
}Results: {
"Contents": " 35:\t/*\n 36:\t * Serial core controller device init functions. Note that the physical\n 37:\t * serial port device driver may not have completed probe at this point.\n 38:\t */\n 39:\tint serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port)\n 40:\t{\n 41:\t\treturn serial_core_register_port(drv, port);\n 42:\t}\n 43:\t\n 44:\tvoid serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port)\n 45:\t{\n 46:\t\tserial_core_unregister_port(drv, port);\n 47:\t}\n 48:\t\n 49:\tstatic struct device_driver serial_ctrl_driver = {\n 50:\t\t.name = \"ctrl\",\n 51:\t\t.suppress_bind_attrs = true,\n 52:\t\t.probe = serial_ctrl_probe,\n 53:\t\t.remove = serial_ctrl_remove,\n 54:\t};\n 55:\t\n 56:\tint serial_base_ctrl_init(void)\n 57:\t{\n 58:\t\treturn serial_base_driver_register(\u0026serial_ctrl_driver);\n 59:\t}\n 60:\t\n 61:\tvoid serial_base_ctrl_exit(void)\n 62:\t{\n 63:\t\tserial_base_driver_unregister(\u0026serial_ctrl_driver);\n 64:\t}\n 65:\t\n 66:\tMODULE_AUTHOR(\"Tony Lindgren \u003ctony@atomide.com\u003e\");\n 67:\tMODULE_DESCRIPTION(\"Serial core controller driver\");\n 68:\tMODULE_LICENSE(\"GPL\");\n"
} |
| 47/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 38004 output: 32 thoughts: 14 Thoughts: Okay, let's break this down. Here's how I'd approach summarizing the thought process behind something like `serial_core_register_port`, from my perspective as an expert in embedded systems: **Registering a Serial Port: My Thoughts** Alright, so we're looking at `serial_core_register_port`. My initial thought is, this is likely a core function, a fundamental building block, within the serial communications subsystem. It’s the entry point, the way a new serial port instance gets recognized and integrated by the system. I instantly start thinking about the implications. First, I need to understand the context. What's the target architecture? Is this bare-metal, RTOS, or some higher-level OS? That drastically shapes how I expect this function to behave. Is this a custom driver, or part of a more standardized serial framework? Knowing the underlying system and driver architecture is critical. Functionally, I'd expect it to do several key things. Most importantly, it probably takes some kind of port descriptor as input. What information is contained in this descriptor? Is it a structure holding the base address of the UART, interrupt numbers, baud rate settings, flow control configuration? That's what I'd want to know immediately. Then, there's the question of resource management. Does this function allocate memory for the port's internal state? Does it register the interrupt handler? Does it set up any initial hardware registers? I'm anticipating that it will handle locking to protect against race conditions, particularly if it's operating within a multi-threaded or interrupt-driven environment. Thinking about the data structures involved, I'm expecting some kind of linked list or a registry-like structure to hold all active serial ports. The `serial_core_register_port` function is likely adding the new port to this list. I also start to consider what other function will deregister these ports. Will there be some kind of `serial_core_deregister_port`? From a robustness standpoint, error handling is critical. How does this function deal with failures? What happens if the port address is invalid, the interrupt vector is already in use, or memory allocation fails? I'd want to see clear error codes or return values indicating the reason for failure. Finally, I'm looking for thread safety. In any modern system, it's virtually guaranteed that multiple tasks or threads could be attempting to access the serial port at the same time. The function *must* be reentrant and protect against data corruption. Expecting that it includes some kind of locking mechanism: a mutex, semaphore, or interrupt disabling. In summary, this is a core function, critical for the serial communications infrastructure. I'm expecting a careful dance of resource management, data structure manipulation, and robust error handling. The details are important, but as an expert I can infer quite a bit about its purpose and potential implementation just from the function name. |
| 48/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "serial_core_register_port",
"PathPrefix": "drivers/tty/serial"
}Results: {
"Output": "drivers/tty/serial/serial_base.h=48=void serial_ctrl_unregister_port(struct uart_driver *drv, struct uart_port *port);\ndrivers/tty/serial/serial_base.h-49-\ndrivers/tty/serial/serial_base.h:50:int serial_core_register_port(struct uart_driver *drv, struct uart_port *port);\ndrivers/tty/serial/serial_base.h-51-void serial_core_unregister_port(struct uart_driver *drv, struct uart_port *port);\n--\ndrivers/tty/serial/serial_core.c=3270=static int serial_core_port_device_add(struct serial_ctrl_device *ctrl_dev,\n--\ndrivers/tty/serial/serial_core.c-3286- */\ndrivers/tty/serial/serial_core.c:3287:int serial_core_register_port(struct uart_driver *drv, struct uart_port *port)\ndrivers/tty/serial/serial_core.c-3288-{\n--\ndrivers/tty/serial/serial_ctrl.c=39=int serial_ctrl_register_port(struct uart_driver *drv, struct uart_port *port)\ndrivers/tty/serial/serial_ctrl.c-40-{\ndrivers/tty/serial/serial_ctrl.c:41:\treturn serial_core_register_port(drv, port);\ndrivers/tty/serial/serial_ctrl.c-42-}\n"
} |
| 49/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 39039 output: 40 thoughts: 25 Thoughts: Okay, here's my interpretation of what's going on, thinking like an expert in the field, starting with the file and line number: **Diving into `serial_core.c` at Line 3287** Alright, let's zero in on `drivers/tty/serial/serial_core.c` around line 3287. I'm guessing this section is probably handling some core serial port functionality. Based on the file name, it's likely involved in the central management of serial drivers. Knowing this area, I can infer that line 3287 is probably a function call, a conditional statement, or perhaps part of a loop within a function that is key to sending/receiving data, managing the port's state, or handling interrupts. My guess is it's dealing with data transmission, perhaps checking for buffer availability or handshaking signals. It could also be related to error handling or flow control, depending on how that functionality is structured within this driver. I'll need to read the surrounding code to understand the specific context. I'm expecting to see calls to lower-level hardware access functions, memory management routines, or potentially spinlocks or mutexes if it's a multi-threaded access point. My hypothesis is that it's a fairly crucial piece of code. |
| 50/2 | 2026/09/28 12:31 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/serial_core.c",
"FirstLine": 3285,
"LineCount": 45
}Results: {
"Contents": "3285:\t * Initialize a serial core port device, and a controller device if needed.\n3286:\t */\n3287:\tint serial_core_register_port(struct uart_driver *drv, struct uart_port *port)\n3288:\t{\n3289:\t\tstruct serial_ctrl_device *ctrl_dev, *new_ctrl_dev = NULL;\n3290:\t\tint ret;\n3291:\t\n3292:\t\tguard(mutex)(\u0026port_mutex);\n3293:\t\n3294:\t\t/*\n3295:\t\t * Prevent serial_port_runtime_resume() from trying to use the port\n3296:\t\t * until serial_core_add_one_port() has completed\n3297:\t\t */\n3298:\t\tport-\u003eflags |= UPF_DEAD;\n3299:\t\n3300:\t\t/* Inititalize a serial core controller device if needed */\n3301:\t\tctrl_dev = serial_core_ctrl_find(drv, port-\u003edev, port-\u003ectrl_id);\n3302:\t\tif (!ctrl_dev) {\n3303:\t\t\tnew_ctrl_dev = serial_core_ctrl_device_add(port);\n3304:\t\t\tif (IS_ERR(new_ctrl_dev))\n3305:\t\t\t\treturn PTR_ERR(new_ctrl_dev);\n3306:\t\t\tctrl_dev = new_ctrl_dev;\n3307:\t\t}\n3308:\t\n3309:\t\t/*\n3310:\t\t * Initialize a serial core port device. Tag the port dead to prevent\n3311:\t\t * serial_port_runtime_resume() trying to do anything until port has\n3312:\t\t * been registered. It gets cleared by serial_core_add_one_port().\n3313:\t\t */\n3314:\t\tret = serial_core_port_device_add(ctrl_dev, port);\n3315:\t\tif (ret)\n3316:\t\t\tgoto err_unregister_ctrl_dev;\n3317:\t\n3318:\t\tret = serial_base_match_and_update_preferred_console(drv, port);\n3319:\t\tif (ret)\n3320:\t\t\tgoto err_unregister_port_dev;\n3321:\t\n3322:\t\tret = serial_core_add_one_port(drv, port);\n3323:\t\tif (ret)\n3324:\t\t\tgoto err_unregister_port_dev;\n3325:\t\n3326:\t\treturn 0;\n3327:\t\n3328:\terr_unregister_port_dev:\n3329:\t\tserial_base_port_device_remove(port-\u003eport_dev);\n"
} |
| 51/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 40089 output: 40 thoughts: 16 Thoughts: Okay, let's dive into this `serial_core_add_one_port` function. My first thought is: I need to quickly grasp its purpose within the broader serial port management context. I'm assuming, given the name, it's responsible for registering or integrating a new serial port into the system. Knowing the architecture of the serial driver, and the specific needs of the current implementation, will be key to understanding it fully. Is it a core function called during driver initialization, or is it invoked dynamically as ports are hot-plugged, and devices enumerate? What are the key data structures this function interacts with? I'll probably be looking for structures that represent the port itself, the driver state, and any global or per-bus data. I'll need to know where the port is added to the overall linked list or registry of ports. I'll look for any locking mechanisms used to ensure thread safety when accessing the shared resources. I'll need to pay close attention to the error handling within this function; what conditions would cause the function to fail, and how are those failures handled? Are there any return codes or error messages? Are resource allocations checked, and memory safely freed on failure? I'll also keep in mind whether this function deals with any interrupt related initializations or enable/disable logic, and whether any callback functions are set up for port-specific events. Overall, it's about seeing how this function contributes to a correct and stable serial port driver implementation. |
| 52/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "serial_core_add_one_port",
"PathPrefix": "drivers/tty/serial/serial_core.c"
}Results: {
"Output": "drivers/tty/serial/serial_core.c=3038=static const struct attribute_group tty_dev_attr_group = {\n--\ndrivers/tty/serial/serial_core.c-3042-/**\ndrivers/tty/serial/serial_core.c:3043: * serial_core_add_one_port - attach a driver-defined port structure\ndrivers/tty/serial/serial_core.c-3044- * @drv: pointer to the uart low level driver structure for this port\n--\ndrivers/tty/serial/serial_core.c-3053- */\ndrivers/tty/serial/serial_core.c:3054:static int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *uport)\ndrivers/tty/serial/serial_core.c-3055-{\n--\ndrivers/tty/serial/serial_core.c=3287=int serial_core_register_port(struct uart_driver *drv, struct uart_port *port)\n--\ndrivers/tty/serial/serial_core.c-3295-\t * Prevent serial_port_runtime_resume() from trying to use the port\ndrivers/tty/serial/serial_core.c:3296:\t * until serial_core_add_one_port() has completed\ndrivers/tty/serial/serial_core.c-3297-\t */\n--\ndrivers/tty/serial/serial_core.c-3311-\t * serial_port_runtime_resume() trying to do anything until port has\ndrivers/tty/serial/serial_core.c:3312:\t * been registered. It gets cleared by serial_core_add_one_port().\ndrivers/tty/serial/serial_core.c-3313-\t */\n--\ndrivers/tty/serial/serial_core.c-3321-\ndrivers/tty/serial/serial_core.c:3322:\tret = serial_core_add_one_port(drv, port);\ndrivers/tty/serial/serial_core.c-3323-\tif (ret)\n"
} |
| 53/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 40979 output: 40 thoughts: 23 Thoughts: Okay, here's my interpretation of what's going on in that code, presented as a first-person thought process, keeping in mind my expert-level understanding: **Analyzing `serial_core.c` Lines 3054-3110** Alright, let's dive into lines 3054 through 3110 of `serial_core.c`. I need to understand this specific section of the code. My initial thought is to identify what critical aspect of the serial communication these lines address. Quickly skimming, I suspect this section is related to either interrupt handling, data buffering, or maybe even flow control, knowing the usual complexity of serial port management. Based on the surrounding code context, this is likely part of the core driver logic. Specifically, I'm now looking for the likely context or method associated with the code. As I zero in, I'm looking for function calls and variable names that will give me clues. I'm searching for things like `read_buffer`, `write_buffer`, `interrupt_enable`, or `flow_control_state`. The presence of a likely mutex or spinlock would also signal a critical section where data integrity is paramount. Now, I'm stepping into the finer details. Are there any conditional statements that dictate the driver's behavior? Are there any data structures being used here and what's their likely purpose? I need to analyze how the code is handling the flow of data, and how the driver is responding to the status of the serial port and any relevant hardware registers. I need to note any unusual bit manipulations, because those are often indicative of low-level hardware control or specific communication protocol encoding. I'm now reading the section in greater detail and I'm looking for clues about how the data is being sent or received. Are there any error checks, and how are they being handled? Are there any attempts at recovery from communication errors? And of course, I'm checking for race conditions – this kind of code is a prime candidate for concurrency issues if not carefully designed. The presence of locks and atomic operations is what I am actively looking for. Okay, having thoroughly examined that block, I'm starting to build a cohesive picture. I'm pretty certain this is about... *[Insert specific interpretation and conclusions here based on analysis, e.g., "handling an incoming interrupt that signals data is ready, reading data from a hardware register into a buffer, checking for a framing error, and then queuing it for the upper layers"].* My understanding of the surrounding code should provide further context. I now have a solid grasp of how it fits into the broader serial port driver strategy. |
| 54/2 | 2026/09/28 12:31 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/serial_core.c",
"FirstLine": 3054,
"LineCount": 60
}Results: {
"Contents": "3054:\tstatic int serial_core_add_one_port(struct uart_driver *drv, struct uart_port *uport)\n3055:\t{\n3056:\t\tstruct uart_state *state;\n3057:\t\tstruct tty_port *port;\n3058:\t\tstruct device *tty_dev;\n3059:\t\tint num_groups;\n3060:\t\n3061:\t\tif (uport-\u003eline \u003e= drv-\u003enr)\n3062:\t\t\treturn -EINVAL;\n3063:\t\n3064:\t\tstate = drv-\u003estate + uport-\u003eline;\n3065:\t\tport = \u0026state-\u003eport;\n3066:\t\n3067:\t\tguard(mutex)(\u0026port-\u003emutex);\n3068:\t\tif (state-\u003euart_port)\n3069:\t\t\treturn -EINVAL;\n3070:\t\n3071:\t\t/* Link the port to the driver state table and vice versa */\n3072:\t\tatomic_set(\u0026state-\u003erefcount, 1);\n3073:\t\tinit_waitqueue_head(\u0026state-\u003eremove_wait);\n3074:\t\tstate-\u003euart_port = uport;\n3075:\t\tuport-\u003estate = state;\n3076:\t\n3077:\t\t/*\n3078:\t\t * If this port is in use as a console then the spinlock is already\n3079:\t\t * initialised.\n3080:\t\t */\n3081:\t\tif (!uart_console_registered(uport))\n3082:\t\t\tuart_port_spin_lock_init(uport);\n3083:\t\n3084:\t\tstate-\u003epm_state = UART_PM_STATE_UNDEFINED;\n3085:\t\tuart_port_set_cons(uport, drv-\u003econs);\n3086:\t\tuport-\u003eminor = drv-\u003etty_driver-\u003eminor_start + uport-\u003eline;\n3087:\t\tuport-\u003ename = kasprintf(GFP_KERNEL, \"%s%u\", drv-\u003edev_name,\n3088:\t\t\t\t\tdrv-\u003etty_driver-\u003ename_base + uport-\u003eline);\n3089:\t\tif (!uport-\u003ename)\n3090:\t\t\treturn -ENOMEM;\n3091:\t\n3092:\t\tif (uport-\u003econs \u0026\u0026 uport-\u003edev)\n3093:\t\t\tof_console_check(uport-\u003edev-\u003eof_node, uport-\u003econs-\u003ename, uport-\u003eline);\n3094:\t\n3095:\t\t/*\n3096:\t\t * TTY port has to be linked with the driver before register_console()\n3097:\t\t * in uart_configure_port(), because user-space could open the console\n3098:\t\t * immediately after.\n3099:\t\t */\n3100:\t\ttty_port_link_device(port, drv-\u003etty_driver, uport-\u003eline);\n3101:\t\tuart_configure_port(drv, state, uport);\n3102:\t\n3103:\t\tport-\u003econsole = uart_console(uport);\n3104:\t\n3105:\t\tnum_groups = 2;\n3106:\t\tif (uport-\u003eattr_group)\n3107:\t\t\tnum_groups++;\n3108:\t\n3109:\t\tuport-\u003etty_groups = kzalloc_objs(*uport-\u003etty_groups, num_groups);\n3110:\t\tif (!uport-\u003etty_groups)\n3111:\t\t\treturn -ENOMEM;\n3112:\t\n3113:\t\tuport-\u003etty_groups[0] = \u0026tty_dev_attr_group;\n"
} |
| 55/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 42550 output: 21 thoughts: 289 Thoughts: **My Line of Inquiry: SPI Device Instantiation in QEMU/Syzkaller** Okay, so `serial_core_add_one_port` just blithely ignores `port->uartclk`. That's a red flag! But, the more pressing question is: does the max3100 SPI device, or *any* SPI device, even get spun up in a syzkaller/QEMU environment? I need to figure out the instantiation path. Hold on, how *would* an SPI device even come into existence within the QEMU context used by syzkaller? I need to understand the fundamental mechanisms at play. This gets me thinking... does syzkaller have legitimate SPI support baked in? Time to check the documentation, syzkaller device descriptions, and the Linux kernel sources. Can an SPI device *or* controller even be created in this environment? Now I'm down a rabbit hole of virtual devices. What virtual or emulated SPI controllers are available within the Linux kernel itself? Let's dive into the `drivers/spi` directory. Okay, a quick scan reveals a few possibilities: `spi-butterfly.c` (using the parallel port, unlikely to be used here), `spi-ch341.c`, `spi-cp2130.c`, `spi-dlpc.c` (all USB based, not ideal), `spi-gpio.c` (platform device, potentially more relevant), `spi-loopback-test.c` (intriguing), and `spidev.c`. Wait a minute, is there a virtual SPI bus, something akin to `vkms`, `vhci`, or a `dummy_hcd` for USB? That would be the key. Is there any kind of dummy or virtual master in Linux specifically designed for SPI? Let's examine `drivers/spi/spi-loopback-test.c` more closely and broaden the search to other files within that directory. I'm getting closer. |
| 56/2 | 2026/09/28 12:31 | tool | codesearch-dir-index |
0mArgs:{
"Dir": "drivers/spi"
}Results: {
"Files": [
"atmel-quadspi.c",
"internals.h",
"spi-airoha-snfi.c",
"spi-altera-core.c",
"spi-altera-dfl.c",
"spi-altera-platform.c",
"spi-amd-pci.c",
"spi-amd.c",
"spi-amd.h",
"spi-amlogic-spifc-a1.c",
"spi-amlogic-spifc-a4.c",
"spi-amlogic-spisg.c",
"spi-apple.c",
"spi-ar934x.c",
"spi-armada-3700.c",
"spi-aspeed-smc.c",
"spi-at91-usart.c",
"spi-atcspi200.c",
"spi-ath79.c",
"spi-atmel.c",
"spi-au1550.c",
"spi-axi-spi-engine.c",
"spi-axiado.c",
"spi-axiado.h",
"spi-bcm-qspi.c",
"spi-bcm-qspi.h",
"spi-bcm2835.c",
"spi-bcm2835aux.c",
"spi-bcm63xx-hsspi.c",
"spi-bcm63xx.c",
"spi-bcmbca-hsspi.c",
"spi-bitbang-txrx.h",
"spi-bitbang.c",
"spi-brcmstb-qspi.c",
"spi-butterfly.c",
"spi-cadence-quadspi.c",
"spi-cadence-xspi.c",
"spi-cadence.c",
"spi-cavium-octeon.c",
"spi-cavium-thunderx.c",
"spi-cavium.c",
"spi-cavium.h",
"spi-ch341.c",
"spi-clps711x.c",
"spi-coldfire-qspi.c",
"spi-cs42l43.c",
"spi-davinci.c",
"spi-dln2.c",
"spi-dw-core.c",
"spi-dw-dma.c",
"spi-dw-mmio.c",
"spi-dw-pci.c",
"spi-dw.h",
"spi-ep93xx.c",
"spi-falcon.c",
"spi-fsi.c",
"spi-fsl-cpm.c",
"spi-fsl-cpm.h",
"spi-fsl-dspi.c",
"spi-fsl-espi.c",
"spi-fsl-lib.c",
"spi-fsl-lib.h",
"spi-fsl-lpspi.c",
"spi-fsl-qspi.c",
"spi-fsl-spi.c",
"spi-fsl-spi.h",
"spi-geni-qcom.c",
"spi-gpio.c",
"spi-gxp.c",
"spi-hisi-kunpeng.c",
"spi-hisi-sfc-v3xx.c",
"spi-img-spfi.c",
"spi-imx.c",
"spi-ingenic.c",
"spi-intel-pci.c",
"spi-intel-platform.c",
"spi-intel.c",
"spi-intel.h",
"spi-iproc-qspi.c",
"spi-jcore.c",
"spi-kspi2.c",
"spi-lantiq-ssc.c",
"spi-ljca.c",
"spi-lm70llp.c",
"spi-loongson-core.c",
"spi-loongson-pci.c",
"spi-loongson-plat.c",
"spi-loongson.h",
"spi-loopback-test.c",
"spi-lp8841-rtc.c",
"spi-mem.c",
"spi-meson-spicc.c",
"spi-meson-spifc.c",
"spi-microchip-core-qspi.c",
"spi-microchip-core-spi.c",
"spi-mpc512x-psc.c",
"spi-mpc52xx-psc.c",
"spi-mpc52xx.c",
"spi-mpfs.c",
"spi-mt65xx.c",
"spi-mt7621.c",
"spi-mtk-nor.c",
"spi-mtk-snfi.c",
"spi-mux.c",
"spi-mxic.c",
"spi-mxs.c",
"spi-npcm-fiu.c",
"spi-npcm-pspi.c",
"spi-nxp-fspi.c",
"spi-nxp-xspi.c",
"spi-oc-tiny.c",
"spi-offload-trigger-adi-util-sigma-delta.c",
"spi-offload-trigger-pwm.c",
"spi-offload.c",
"spi-omap-uwire.c",
"spi-omap2-mcspi.c",
"spi-orion.c",
"spi-pci1xxxx.c",
"spi-pic32-sqi.c",
"spi-pic32.c",
"spi-pl022.c",
"spi-ppc4xx.c",
"spi-pxa2xx-dma.c",
"spi-pxa2xx-pci.c",
"spi-pxa2xx-platform.c",
"spi-pxa2xx.c",
"spi-pxa2xx.h",
"spi-qcom-qspi.c",
"spi-qpic-snand.c",
"spi-qup.c",
"spi-rb4xx.c",
"spi-realtek-rtl-snand.c",
"spi-realtek-rtl.c",
"spi-rockchip-sfc.c",
"spi-rockchip.c",
"spi-rpc-if.c",
"spi-rspi.c",
"spi-rzv2h-rspi.c",
"spi-rzv2m-csi.c",
"spi-s3c64xx.c",
"spi-sc18is602.c",
"spi-sg2044-nor.c",
"spi-sh-hspi.c",
"spi-sh-msiof.c",
"spi-sh-sci.c",
"spi-sh.c",
"spi-sifive.c",
"spi-slave-mt27xx.c",
"spi-slave-system-control.c",
"spi-slave-time.c",
"spi-sn-f-ospi.c",
"spi-spacemit-k1.c",
"spi-sprd-adi.c",
"spi-sprd.c",
"spi-st-ssc4.c",
"spi-stm32-ospi.c",
"spi-stm32-qspi.c",
"spi-stm32.c",
"spi-sun4i.c",
"spi-sun6i.c",
"spi-sunplus-sp7021.c",
"spi-synquacer.c",
"spi-tegra114.c",
"spi-tegra20-sflash.c",
"spi-tegra20-slink.c",
"spi-tegra210-quad.c",
"spi-test.h",
"spi-ti-qspi.c",
"spi-tle62x0.c",
"spi-topcliff-pch.c",
"spi-uniphier.c",
"spi-virtio.c",
"spi-wpcm-fiu.c",
"spi-xcomm.c",
"spi-xilinx.c",
"spi-xlp.c",
"spi-xtensa-xtfpga.c",
"spi-zynq-qspi.c",
"spi-zynqmp-gqspi.c",
"spi.c",
"spidev.c"
],
"Subdirs": null
} |
| 57/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 45337 output: 36 thoughts: 40 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Initial Assessment of a Codebase Reference** Right, *that* list. Ah, and there it is: `spi-virtio.c`. My mind immediately goes to, "Hang on, what's this `spi-virtio.c` doing here?" Virtio's usually reserved for things like network or block devices, rarely SPI directly. I've seen some *interesting* virtio implementations over the years, but SPI's usually so low level. I'm going to have to dive right into the code itself, `spi-virtio.c`, to understand its design choices and intended use case. This could be something interesting, or a potential source of headaches, but it has to be investigated. |
| 58/2 | 2026/09/28 12:31 | tool | read-file |
0mArgs:{
"File": "drivers/spi/spi-virtio.c",
"FirstLine": 1,
"LineCount": 40
}Results: {
"Contents": " 1:\t// SPDX-License-Identifier: GPL-2.0-only\n 2:\t/*\n 3:\t * SPI bus driver for the Virtio SPI controller\n 4:\t * Copyright (C) 2023 OpenSynergy GmbH\n 5:\t * Copyright (C) 2025 Qualcomm Innovation Center, Inc. All rights reserved.\n 6:\t */\n 7:\t\n 8:\t#include \u003clinux/completion.h\u003e\n 9:\t#include \u003clinux/interrupt.h\u003e\n 10:\t#include \u003clinux/io.h\u003e\n 11:\t#include \u003clinux/module.h\u003e\n 12:\t#include \u003clinux/spi/spi.h\u003e\n 13:\t#include \u003clinux/stddef.h\u003e\n 14:\t#include \u003clinux/virtio.h\u003e\n 15:\t#include \u003clinux/virtio_ring.h\u003e\n 16:\t#include \u003clinux/virtio_spi.h\u003e\n 17:\t\n 18:\t#define VIRTIO_SPI_MODE_MASK \\\n 19:\t\t(SPI_MODE_X_MASK | SPI_CS_HIGH | SPI_LSB_FIRST)\n 20:\t\n 21:\tstruct virtio_spi_req {\n 22:\t\tstruct completion completion;\n 23:\t\tconst u8 *tx_buf;\n 24:\t\tu8 *rx_buf;\n 25:\t\tstruct spi_transfer_head transfer_head\t____cacheline_aligned;\n 26:\t\tstruct spi_transfer_result result;\n 27:\t};\n 28:\t\n 29:\tstruct virtio_spi_priv {\n 30:\t\t/* The virtio device we're associated with */\n 31:\t\tstruct virtio_device *vdev;\n 32:\t\t/* Pointer to the virtqueue */\n 33:\t\tstruct virtqueue *vq;\n 34:\t\t/* Copy of config space mode_func_supported */\n 35:\t\tu32 mode_func_supported;\n 36:\t\t/* Copy of config space max_freq_hz */\n 37:\t\tu32 max_freq_hz;\n 38:\t};\n 39:\t\n 40:\tstatic void virtio_spi_msg_done(struct virtqueue *vq)\n"
} |
| 59/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 46171 output: 41 thoughts: 45 Thoughts: Okay, here's my take on those thoughts, framed as an expert's internal monologue: **Virtio-SPI and Device Creation - My Initial Assessment** Right, virtio-spi… that's the virtio driver implementation for an SPI controller, I get that. But the crux of the question, the real point I need to nail down quickly, is whether it *actually* establishes SPI slave devices. It's not enough to simply control the controller itself, it needs to be able to logically represent and present those slaves to the guest OS. I need to be sure the driver handles slave device instantiation correctly, for example is it creating the *spi_device* structure, and linking it to the bus? Let's cut to the chase and confirm this. Time to dig into the source code and look for calls, specifically to `spi_new_device`. Any sort of device or bus creation function would work, but `spi_new_device` is the obvious starting point for SPI slave initialization. That's the function that would create and register a new SPI device, and give me the behavior I'd expect. I bet that's what's happening. |
| 60/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "spi_new_device|spi_register_controller",
"PathPrefix": "drivers/spi/spi-virtio.c"
}Results: {
"Output": "drivers/spi/spi-virtio.c=332=static int virtio_spi_probe(struct virtio_device *vdev)\n--\ndrivers/spi/spi-virtio.c-361-\t/* Use devm version to register controller */\ndrivers/spi/spi-virtio.c:362:\tret = devm_spi_register_controller(\u0026vdev-\u003edev, ctrl);\ndrivers/spi/spi-virtio.c-363-\tif (ret)\n"
} |
| 61/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 46634 output: 43 thoughts: 83 Thoughts: **Delving into SPI Controller Registration** Okay, so I'm thinking about `devm_spi_register_controller`. When I call that function, what exactly happens during the SPI controller registration process? My initial thought is it's going to scan for attached SPI devices, right? It probably checks ACPI tables, the device tree (DT), or maybe even board information to find devices on that particular bus. But hang on a second... can SPI devices themselves be *attached* or *instantiated* in that context? I'm getting a little fuzzy on the details of how the Linux SPI framework handles device population. Right, so how are the SPI devices actually populated and made known to the system in Linux? I need to refresh my memory on the underlying mechanics. Let's dig into the `spi_register_controller` function. I'll find it in `drivers/spi/spi.c`. That should give me the answers I'm looking for. Let's see how the magic happens! |
| 62/2 | 2026/09/28 12:31 | tool | grepper |
0mArgs:{
"Expression": "of_register_spi_devices|acpi_register_spi_devices",
"PathPrefix": "drivers/spi/spi.c"
}Results: {
"Output": "drivers/spi/spi.c=2615=of_register_spi_device(struct spi_controller *ctlr, struct device_node *nc)\n--\ndrivers/spi/spi.c-2661-/**\ndrivers/spi/spi.c:2662: * of_register_spi_devices() - Register child devices onto the SPI bus\ndrivers/spi/spi.c-2663- * @ctlr:\tPointer to spi_controller device\n--\ndrivers/spi/spi.c-2667- */\ndrivers/spi/spi.c:2668:static void of_register_spi_devices(struct spi_controller *ctlr)\ndrivers/spi/spi.c-2669-{\n--\ndrivers/spi/spi.c-2684-#else\ndrivers/spi/spi.c:2685:static void of_register_spi_devices(struct spi_controller *ctlr) { }\ndrivers/spi/spi.c-2686-#endif\n--\ndrivers/spi/spi.c=3066=static acpi_status acpi_spi_add_device(acpi_handle handle, u32 level,\n--\ndrivers/spi/spi.c-3079-\ndrivers/spi/spi.c:3080:static void acpi_register_spi_devices(struct spi_controller *ctlr)\ndrivers/spi/spi.c-3081-{\n--\ndrivers/spi/spi.c-3095-#else\ndrivers/spi/spi.c:3096:static inline void acpi_register_spi_devices(struct spi_controller *ctlr) {}\ndrivers/spi/spi.c-3097-#endif /* CONFIG_ACPI */\n--\ndrivers/spi/spi.c=3451=int spi_register_controller(struct spi_controller *ctlr)\n--\ndrivers/spi/spi.c-3551-\t/* Register devices from the device tree and ACPI */\ndrivers/spi/spi.c:3552:\tof_register_spi_devices(ctlr);\ndrivers/spi/spi.c:3553:\tacpi_register_spi_devices(ctlr);\ndrivers/spi/spi.c-3554-\n"
} |
| 63/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 47528 output: 41 thoughts: 304 Thoughts: **My Initial Assessment of MAX3100 SPI Device Registration** Okay, so I'm thinking about how the `MAX3100` SPI driver gets instantiated in this system. I see that SPI devices are registered through a few key mechanisms: first, using device tree (`of_register_spi_devices`), second through ACPI (`acpi_register_spi_devices`), third via board info (`spi_match_controller_to_boardinfo`), and finally, the less common, direct `spi_new_device` calls coming from platform or USB drivers. Now, a crucial question arises: does the QEMU/GCE environment, particularly its ACPI implementation, even *define* a `MAX3100` SPI device? I highly doubt it. QEMU’s ACPI DSDT/SSDT focuses on emulating standard PC hardware – things like PCI root buses, the RTC, HPET, keyboard, mouse, serial ports, IDE controllers. Definitely no `MAX3100` on SPI in those tables. Alright, but wait...What about Device Tree on an x86 system? Well, it's not applicable. x86 doesn’t use Device Tree. Then, there's the dynamic loading question: Can we load Device Tree overlays or custom ACPI tables dynamically from user space within syzkaller? Now, syzkaller has some interesting dynamic configuration, but it's not usually directly loading DT overlays or custom ACPI tables unless there is a pseudo-syscall or sysfs interface. Does syzkaller even have configurations or coverage for the `drivers/tty/serial/max3100.c` driver? I think I need to dig into the git log of that driver to find out. |
| 64/2 | 2026/09/28 12:31 | tool | grepper |
0mError:no matches Args: {
"Expression": "Reported-by: syzbot",
"PathPrefix": "drivers/tty/serial/max3100.c"
}Results: {
"error": "no matches"
} |
| 65/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 48260 output: 41 thoughts: 117 Thoughts: Okay, let's dive into this. Here's how I'd approach understanding the changes related to `max3100.c`, thinking like a seasoned embedded systems developer: **Investigating Recent Changes in `max3100.c`** Alright, I need to get a handle on what's been going on with `max3100.c`. My initial thought is to immediately check the commit history, see the recent changes. Quickly, I'd want to use `git log`, see what commits touch this file. Wait, I remember, no `git log` tool! Hmm, okay, no problem. If I can't directly check the commit history, I can try to find clues within the file itself. See if there are any hints related to the patch, or maybe the commit hash. Anything like that. I can also look for references to recent changes in comments or code blocks. Since the file is `drivers/tty/serial/max3100.c`, I'll focus on the area around the `max3100_remove` and `max3100_shutdown` functions. That's likely where any critical changes related to device removal or power management would be. |
| 66/2 | 2026/09/28 12:31 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/max3100.c",
"FirstLine": 520,
"LineCount": 40
}Results: {
"Contents": " 520:\t\t\tmax3100_enable_ms(\u0026s-\u003eport);\n 521:\t}\n 522:\t\n 523:\tstatic void max3100_shutdown(struct uart_port *port)\n 524:\t{\n 525:\t\tstruct max3100_port *s = to_max3100_port(port);\n 526:\t\tu16 rx;\n 527:\t\n 528:\t\tdev_dbg(\u0026s-\u003espi-\u003edev, \"%s\\n\", __func__);\n 529:\t\n 530:\t\tif (s-\u003esuspending)\n 531:\t\t\treturn;\n 532:\t\n 533:\t\ts-\u003eforce_end_work = 1;\n 534:\t\n 535:\t\ttimer_delete_sync(\u0026s-\u003etimer);\n 536:\t\n 537:\t\tif (s-\u003eworkqueue) {\n 538:\t\t\tfree_irq(port-\u003eirq, s);\n 539:\t\t\tcancel_work_sync(\u0026s-\u003ework);\n 540:\t\t\tdestroy_workqueue(s-\u003eworkqueue);\n 541:\t\t\ts-\u003eworkqueue = NULL;\n 542:\t\t}\n 543:\t\n 544:\t\t/* set shutdown mode to save power */\n 545:\t\tmax3100_sr(s, MAX3100_WC | MAX3100_SHDN, \u0026rx);\n 546:\t}\n 547:\t\n 548:\tstatic int max3100_startup(struct uart_port *port)\n 549:\t{\n 550:\t\tstruct max3100_port *s = to_max3100_port(port);\n 551:\t\tchar b[12];\n 552:\t\tint ret;\n 553:\t\n 554:\t\tdev_dbg(\u0026s-\u003espi-\u003edev, \"%s\\n\", __func__);\n 555:\t\n 556:\t\ts-\u003econf = MAX3100_RM;\n 557:\t\ts-\u003ebaud = port-\u003euartclk / 16;\n 558:\t\ts-\u003erx_enabled = 1;\n 559:\t\n"
} |
| 67/2 | 2026/09/28 12:31 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 49271 output: 30 thoughts: 1163 Thoughts: **Analysis of max3100 Driver Removal and Shutdown** Okay, let's break this down. We're looking at `max3100_remove` and trying to determine if this patch is fuzzable. First, `max3100_remove`. We see it's a standard `spi_driver` `.remove` callback. Then we see it touches `max3100_shutdown(struct uart_port *port)`. Hang on… is `max3100_shutdown` a driver teardown function or a `uart_ops` callback? Right, it's a `uart_ops` callback, specifically the `shutdown` function. `serial_core`'s `uart_shutdown` will call it. So, *if* a `/dev/ttyMAX0` port could be opened and closed, `max3100_shutdown` *would* execute. But, `max3100_remove` is also being touched, which *is* the `.remove` callback for the `max3100_driver`. Now the core question: Can `max3100` *ever* be probed in a standard virtualized environment like GCE or QEMU on amd64? This is the crux of it. Let's see... is it "Structurally unreachable hardware"? We need to check if the MAX3100 requires a physical chip not emulated in QEMU. The MAX3100 is an "SPI/Microwire-Compatible UART with I/O Expander." Does standard QEMU emulate a MAX3100? No. Does QEMU x86 emulate an SPI bus with a MAX3100 attached? No. Can MAX3100 be instantiated in any way on amd64 in QEMU? Let's check: Can we get an SPI device with `modalias = "max3100"` or `compatible = "maxim,max3100"`? Could it be instantiated via ACPI? Can a user load arbitrary ACPI SSDT tables at runtime to *force* it? Let's check for ways to load ACPI tables - specifically searching for `configfs` and ACPI table loading. I need to grep and see... |
| 68/2 | 2026/09/28 12:32 | tool | grepper |
0mArgs:{
"Expression": "acpi_load_table",
"PathPrefix": "drivers/acpi"
}Results: {
"Output": "drivers/acpi/acpi_configfs.c=24=static ssize_t acpi_table_aml_write(struct config_item *cfg,\n--\ndrivers/acpi/acpi_configfs.c-56-\ndrivers/acpi/acpi_configfs.c:57:\tret = acpi_load_table(table-\u003eheader, \u0026table-\u003eindex);\ndrivers/acpi/acpi_configfs.c-58-\tif (ret) {\n--\ndrivers/acpi/acpica/dbfileio.c=84=acpi_status acpi_db_load_tables(struct acpi_new_table_desc *list_head)\n--\ndrivers/acpi/acpica/dbfileio.c-95-\ndrivers/acpi/acpica/dbfileio.c:96:\t\tstatus = acpi_load_table(table, NULL);\ndrivers/acpi/acpica/dbfileio.c-97-\t\tif (ACPI_FAILURE(status)) {\n--\ndrivers/acpi/acpica/tbinstal.c=34=acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,\n--\ndrivers/acpi/acpica/tbinstal.c-91- * When this function is called by \"Load\" or \"LoadTable\" opcodes,\ndrivers/acpi/acpica/tbinstal.c:92: * or by acpi_load_table() API, the \"Reload\" parameter is set.\ndrivers/acpi/acpica/tbinstal.c-93- * After successfully returning from this function, table is\n--\ndrivers/acpi/acpica/tbxfload.c=19=ACPI_MODULE_NAME(\"tbxfload\")\n--\ndrivers/acpi/acpica/tbxfload.c-22- *\ndrivers/acpi/acpica/tbxfload.c:23: * FUNCTION: acpi_load_tables\ndrivers/acpi/acpica/tbxfload.c-24- *\n--\ndrivers/acpi/acpica/tbxfload.c-31- ******************************************************************************/\ndrivers/acpi/acpica/tbxfload.c:32:acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)\ndrivers/acpi/acpica/tbxfload.c-33-{\n--\ndrivers/acpi/acpica/tbxfload.c-35-\ndrivers/acpi/acpica/tbxfload.c:36:\tACPI_FUNCTION_TRACE(acpi_load_tables);\ndrivers/acpi/acpica/tbxfload.c-37-\n--\ndrivers/acpi/acpica/tbxfload.c-46-\t * Note that we allow OSPMs to install their own region handlers\ndrivers/acpi/acpica/tbxfload.c:47:\t * between acpi_initialize_subsystem() and acpi_load_tables() to use\ndrivers/acpi/acpica/tbxfload.c-48-\t * their customized default region handlers.\n--\ndrivers/acpi/acpica/tbxfload.c-86-\ndrivers/acpi/acpica/tbxfload.c:87:ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)\ndrivers/acpi/acpica/tbxfload.c-88-\n--\ndrivers/acpi/acpica/tbxfload.c=101=acpi_status acpi_tb_load_namespace(void)\n--\ndrivers/acpi/acpica/tbxfload.c-235- * Note: This function should only be invoked after\ndrivers/acpi/acpica/tbxfload.c:236: * acpi_initialize_tables() and before acpi_load_tables().\ndrivers/acpi/acpica/tbxfload.c-237- *\n--\ndrivers/acpi/acpica/tbxfload.c=256=ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)\n--\ndrivers/acpi/acpica/tbxfload.c-267- * Note: This function should only be invoked after\ndrivers/acpi/acpica/tbxfload.c:268: * acpi_initialize_tables() and before acpi_load_tables().\ndrivers/acpi/acpica/tbxfload.c-269- *\n--\ndrivers/acpi/acpica/tbxfload.c=287=ACPI_EXPORT_SYMBOL_INIT(acpi_install_physical_table)\n--\ndrivers/acpi/acpica/tbxfload.c-290- *\ndrivers/acpi/acpica/tbxfload.c:291: * FUNCTION: acpi_load_table\ndrivers/acpi/acpica/tbxfload.c-292- *\n--\ndrivers/acpi/acpica/tbxfload.c-306- ******************************************************************************/\ndrivers/acpi/acpica/tbxfload.c:307:acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx)\ndrivers/acpi/acpica/tbxfload.c-308-{\n--\ndrivers/acpi/acpica/tbxfload.c-311-\ndrivers/acpi/acpica/tbxfload.c:312:\tACPI_FUNCTION_TRACE(acpi_load_table);\ndrivers/acpi/acpica/tbxfload.c-313-\n--\ndrivers/acpi/acpica/tbxfload.c-339-\ndrivers/acpi/acpica/tbxfload.c:340:ACPI_EXPORT_SYMBOL(acpi_load_table)\ndrivers/acpi/acpica/tbxfload.c-341-\n--\ndrivers/acpi/acpica/tbxfload.c=422=ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)\n--\ndrivers/acpi/acpica/tbxfload.c-426- *\ndrivers/acpi/acpica/tbxfload.c:427: * PARAMETERS: table_index - Index as returned by acpi_load_table\ndrivers/acpi/acpica/tbxfload.c-428- *\n--\ndrivers/acpi/bus.c=1472=static int __init acpi_bus_init(void)\n--\ndrivers/acpi/bus.c-1478-\ndrivers/acpi/bus.c:1479:\tstatus = acpi_load_tables();\ndrivers/acpi/bus.c-1480-\tif (ACPI_FAILURE(status)) {\n"
} |
| 69/2 | 2026/09/28 12:32 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 52649 output: 42 thoughts: 745 Thoughts: **Analyzing the MAX3100 Driver for Fuzzing Potential**
Okay, so I'm thinking about how to approach fuzzing this ACPI configfs table loading situation. The first thought is whether Syzkaller can inject an SPI bus controller and then an SPI child device, but I immediately remember that Syzkaller *doesn't* generate compiled AML bytecode directly for this kind of thing.
Next, I consider Syzkaller's syzlang descriptions. I need to check if Syzkaller even supports SPI devices at all. Ah, right! I remember this critical instruction: I *can't* use the usual syzlang searching tools like directly examining `dev_*.txt` or `socket_*.txt` files because of the `long syz_` pseudo-syscalls. Those aren't in the kernel. I need to use `read-syz-spec` and `syz-grepper` instead.
Wait... are those tools even available in this environment? Let's check the tool declarations. Damn, it looks like I only have `grepper`, `read-file`, `codesearch-dir-index`, and `set-results`. No `read-syz-spec` and no `syz-grepper`. Okay, so just `grepper` and kernel tools. That's a serious limitation.
Now, let's refocus. Can I somehow reach `drivers/tty/serial/max3100.c` without actual physical hardware? Let's break down how this driver works. I see it's an SPI device driver. Specifically, it uses `spi_driver` structure:
```c
static struct spi_driver max3100_driver = {
.driver = {
.name = "max3100",
.of_match_table = max3100_of_match,
.pm = pm_sleep_ptr(&max3100_pm_ops),
},
.probe = max3100_probe,
.remove = max3100_remove,
.id_table = max3100_spi_id,
};
module_spi_driver(max3100_driver);
```
So, for the `max3100_probe` function to be called, there needs to be a `spi_device` registered. Its name has to be `"max3100"` or the OF compatible needs to match `"maxim,max3100"`. Okay, I see. In `max3100_probe`, it reads the clock frequency from a property, which is vital. If that's not set, `uart_add_one_port` will fail. It then calls `uart_add_one_port` and, finally, sets the shutdown mode via `max3100_sr`. I should probably examine `max3100_sr` next.
|
| 70/2 | 2026/09/28 12:32 | tool | grepper |
0mArgs:{
"Expression": "int max3100_sr\\(",
"PathPrefix": "drivers/tty/serial/max3100.c"
}Results: {
"Output": "drivers/tty/serial/max3100.c=145=static void max3100_calc_parity(struct max3100_port *s, u16 *c)\n--\ndrivers/tty/serial/max3100.c-155-\ndrivers/tty/serial/max3100.c:156:static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)\ndrivers/tty/serial/max3100.c-157-{\n"
} |
| 71/2 | 2026/09/28 12:32 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 54236 output: 41 thoughts: 13 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience, and written in the first person: **Analyzing the `max3100_sr` Code** Alright, let's dive into this `max3100_sr` code. My initial thought is to understand its purpose. Given the name, I'm expecting something related to the MAX3100 serial interface chip, possibly with a focus on shift registers (the "sr" suffix hints at this). I'll quickly scan the header files first – I'm looking for includes that reveal dependencies on specific hardware libraries or definitions of crucial registers and bit fields for the MAX3100 itself. I'm mentally running through the typical operational modes of this chip: SPI or UART, framing, parity, baud rate configuration – how is all of that handled? Is this a bare-metal implementation, or is there an RTOS in play? The structure definitions are critical here; how are the control and status registers mapped? Are they using memory-mapped I/O? What are the interrupt service routines doing, if any? I'll look for any custom structures or macros defined that relate to the device configuration. I'm particularly interested in the initialization sequence. How is the chip powered up and configured? What registers are being written to? Is there a documented procedure for clock selection and baud rate generation? Are they handling the reset correctly? I'll want to trace any potential timing dependencies: are there delays or handshaking involved, especially in regards to the Serial output? Then, I'll pay close attention to the data transfer functions. I'll need to confirm that the byte transmission and reception are efficient and reliable. How are they managing buffer sizes and potential overflow/underflow conditions? What error handling is in place? I will expect error-checking, even if it is rudimentary, within the read and write operations, and I will be looking for a mechanism to alert the user of these errors. Are they using DMA, or is it purely interrupt-driven or polled? Is there a software or hardware flow control? Finally, I need to see how they integrate with the higher-level application code. Are there abstraction layers? Are there API calls I can easily use? |
| 72/2 | 2026/09/28 12:32 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/max3100.c",
"FirstLine": 156,
"LineCount": 25
}Results: {
"Contents": " 156:\tstatic int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx)\n 157:\t{\n 158:\t\tstruct spi_message message;\n 159:\t\t__be16 etx, erx;\n 160:\t\tint status;\n 161:\t\tstruct spi_transfer tran = {\n 162:\t\t\t.tx_buf = \u0026etx,\n 163:\t\t\t.rx_buf = \u0026erx,\n 164:\t\t\t.len = 2,\n 165:\t\t};\n 166:\t\n 167:\t\tetx = cpu_to_be16(tx);\n 168:\t\tspi_message_init(\u0026message);\n 169:\t\tspi_message_add_tail(\u0026tran, \u0026message);\n 170:\t\tstatus = spi_sync(s-\u003espi, \u0026message);\n 171:\t\tif (status) {\n 172:\t\t\tdev_warn(\u0026s-\u003espi-\u003edev, \"error while calling spi_sync\\n\");\n 173:\t\t\treturn -EIO;\n 174:\t\t}\n 175:\t\t*rx = be16_to_cpu(erx);\n 176:\t\ts-\u003etx_empty = (*rx \u0026 MAX3100_T) \u003e 0;\n 177:\t\tdev_dbg(\u0026s-\u003espi-\u003edev, \"%04x - %04x\\n\", tx, *rx);\n 178:\t\treturn 0;\n 179:\t}\n 180:\t\n"
} |
| 73/2 | 2026/09/28 12:32 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 55179 output: 50 thoughts: 759 Thoughts: **My Assessment of the `spi_sync` Patch for Fuzzing Eligibility** Okay, so I'm looking at this patch and my initial thought is, it sends an SPI message to the hardware. But before I even dig into the code changes, I need to apply the triage criteria – remember, reachability is paramount. The primary question is: can this code *actually* execute within a standard virtualized environment like GCE or QEMU, utilizing software-emulated devices? If it's structurally unreachable, we're done; no fuzzing, regardless of how complex the logic is. Let's quickly review Section 2: my key focus is if the code modifications fall into these forbidden categories: non-kernel and non-executable changes, or structurally unreachable hardware, or unreachable execution paths. Specifically, I'm watching for hardware like vendor-specific PCIe switches, SmartNICs, or GPU drivers that need specialized ASICs or PCIe cards not emulated in QEMU, or *driver teardown callbacks* called only during hot-unplug or manual driver unbinding. Right, so the important section now is "Unreachable execution paths: Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver) executed only during physical PCI hot-unplug or manual sysfs driver unbinding." Now, what are the two functions modified in this patch? Looks like `max3100_remove` and `max3100_shutdown`. Hold on... `max3100_remove` is *definitely* a driver teardown callback (`.remove`)! That's good to know! But, what about `max3100_shutdown`? Hmm, is *that* a teardown callback, or is it related to a different driver function? In `max3100`, `.shutdown` doesn't exist, but it *does* exist in `max3100_ops`: `.shutdown = max3100_shutdown,` Okay, I see. `uart_ops`'s `.shutdown` is called when closing the serial port, like `/dev/ttyMAX0`. The next important question is: is the `max3100` hardware *reachable* in a standard virtualized environment like QEMU on amd64? This is key. The MAX3100 is an external SPI UART transceiver IC (Maxim MAX3100/3110/3111/3222). It's *not* emulated in standard QEMU, and there is no SPI controller attached to a MAX3100 in QEMU amd64. So, it looks like it is not reachable. But... can someone try to argue that an SPI device could be created via USB raw gadget? Okay, so if we're emulating a USB device using raw gadget, which USB drivers register an SPI controller? Let's check which USB drivers use `spi_register_controller` or `spi_alloc_host`. So far, in `drivers/spi`, I see: * `spi-ch341.c`: registers a controller and then calls `spi_new_device(ctrl, &chip);` where chip.modalias is `"spi-ch341a"`. * `spi-cp2130.c`: Hmmm. Let's check `spi-cp2130.c`! |
| 74/2 | 2026/09/28 12:32 | tool | grepper |
0mError:no matches Args: {
"Expression": "spi_new_device|spi_alloc_host|spi_register_controller",
"PathPrefix": "drivers/spi/spi-cp2130.c"
}Results: {
"error": "no matches"
} |
| 75/2 | 2026/09/28 12:32 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 56739 output: 35 thoughts: 18 Thoughts: Here's my thought process, as if I were analyzing that prompt: **Analyzing the Search Strategy for USB-connected SPI Controllers** Okay, so the goal is to identify USB drivers that are also somehow responsible for managing SPI controllers. My immediate thought is, let's not just assume this is a trivial search. I need to be efficient and precise. Just scanning the code won't cut it. This implies a potentially complex relationship between the USB and SPI subsystems. My initial strategy is to *grep* – that's the obvious choice for quickly navigating a codebase, I can leverage its power for pattern matching – across the entire source code tree. Now the key is the search term: I need to look for USB drivers, but also for the registration of SPI controllers. I'm thinking about how the Linux kernel is structured: USB drivers probably register themselves in the USB core somehow, and SPI controllers will have their own registration mechanism, likely involving specific API functions. So, I need to craft a search string that targets both. I'll need to figure out what functions are used for registering SPI controllers, then determine how I can combine that with USB driver registration patterns, I'm already thinking about potential false positives. I'll have to inspect the results carefully to ensure it's not just returning any USB-related code and any SPI code. This will be a multi-step process, but a *grep* across the whole tree seems like the best starting point to find this very specific relationship. This should be a good starting point for discovery. |
| 76/2 | 2026/09/28 12:32 | tool | grepper |
0mArgs:{
"Expression": "spi_register_controller\\(|spi_register_master\\(",
"PathPrefix": "drivers/"
}Results: {
"Output": "\nFull output is too long, showing 500 out of 843 lines.\nUse more precise expression if possible.\n\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c=173=int netup_spi_init(struct netup_unidvb_dev *ndev)\n--\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c-197-\tndev-\u003espi = nspi;\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c:198:\tif (spi_register_controller(ctlr)) {\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c-199-\t\tndev-\u003espi = NULL;\n--\ndrivers/media/usb/msi2500/msi2500.c=1176=static int msi2500_probe(struct usb_interface *intf,\n--\ndrivers/media/usb/msi2500/msi2500.c-1248-\tspi_controller_set_devdata(ctlr, dev);\ndrivers/media/usb/msi2500/msi2500.c:1249:\tret = spi_register_controller(ctlr);\ndrivers/media/usb/msi2500/msi2500.c-1250-\tif (ret)\n--\ndrivers/spi/atmel-quadspi.c=1348=static int atmel_qspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/atmel-quadspi.c-1455-\ndrivers/spi/atmel-quadspi.c:1456:\terr = spi_register_controller(ctrl);\ndrivers/spi/atmel-quadspi.c-1457-\tif (err)\n--\ndrivers/spi/spi-airoha-snfi.c=1060=static int airoha_snand_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-airoha-snfi.c-1131-\ndrivers/spi/spi-airoha-snfi.c:1132:\treturn devm_spi_register_controller(dev, ctrl);\ndrivers/spi/spi-airoha-snfi.c-1133-}\n--\ndrivers/spi/spi-altera-dfl.c=124=static int dfl_spi_altera_probe(struct dfl_device *dfl_dev)\n--\ndrivers/spi/spi-altera-dfl.c-160-\ndrivers/spi/spi-altera-dfl.c:161:\terr = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-altera-dfl.c-162-\tif (err)\n--\ndrivers/spi/spi-altera-platform.c=35=static int altera_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-altera-platform.c-113-\ndrivers/spi/spi-altera-platform.c:114:\terr = devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-altera-platform.c-115-\tif (err)\n--\ndrivers/spi/spi-amd.c=821=int amd_spi_probe_common(struct device *dev, struct spi_controller *host)\n--\ndrivers/spi/spi-amd.c-839-\t/* Register the controller with SPI framework */\ndrivers/spi/spi-amd.c:840:\terr = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-amd.c-841-\tif (err)\n--\ndrivers/spi/spi-amlogic-spifc-a1.c=326=static int amlogic_spifc_a1_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-amlogic-spifc-a1.c-368-\ndrivers/spi/spi-amlogic-spifc-a1.c:369:\tret = devm_spi_register_controller(spifc-\u003edev, ctrl);\ndrivers/spi/spi-amlogic-spifc-a1.c-370-\tif (ret)\n--\ndrivers/spi/spi-amlogic-spifc-a4.c=1093=static int aml_sfc_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-amlogic-spifc-a4.c-1177-\ndrivers/spi/spi-amlogic-spifc-a4.c:1178:\treturn devm_spi_register_controller(dev, ctrl);\ndrivers/spi/spi-amlogic-spifc-a4.c-1179-}\n--\ndrivers/spi/spi-amlogic-spisg.c=712=static int aml_spisg_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-amlogic-spisg.c-799-\ndrivers/spi/spi-amlogic-spisg.c:800:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-amlogic-spisg.c-801-\tif (ret) {\n--\ndrivers/spi/spi-apple.c=457=static int apple_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-apple.c-504-\ndrivers/spi/spi-apple.c:505:\tret = devm_spi_register_controller(\u0026pdev-\u003edev, ctlr);\ndrivers/spi/spi-apple.c-506-\tif (ret \u003c 0)\n--\ndrivers/spi/spi-ar934x.c=165=static int ar934x_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-ar934x.c-207-\ndrivers/spi/spi-ar934x.c:208:\treturn spi_register_controller(ctlr);\ndrivers/spi/spi-ar934x.c-209-}\n--\ndrivers/spi/spi-armada-3700.c=813=static int a3700_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-armada-3700.c-874-\ndrivers/spi/spi-armada-3700.c:875:\tret = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-armada-3700.c-876-\tif (ret) {\n--\ndrivers/spi/spi-aspeed-smc.c=957=static int aspeed_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-aspeed-smc.c-1023-\ndrivers/spi/spi-aspeed-smc.c:1024:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-aspeed-smc.c-1025-\tif (ret)\n--\ndrivers/spi/spi-at91-usart.c=476=static int at91_usart_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-at91-usart.c-554-\ndrivers/spi/spi-at91-usart.c:555:\tret = spi_register_controller(controller);\ndrivers/spi/spi-at91-usart.c-556-\tif (ret)\n--\ndrivers/spi/spi-atcspi200.c=545=static int atcspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-atcspi200.c-588-\ndrivers/spi/spi-atcspi200.c:589:\tret = devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-atcspi200.c-590-\tif (ret)\n--\ndrivers/spi/spi-atmel.c=1287=static int atmel_spi_setup(struct spi_device *spi)\n--\ndrivers/spi/spi-atmel.c-1303-\ndrivers/spi/spi-atmel.c:1304:\t/* Setup() is called during spi_register_controller(aka\ndrivers/spi/spi-atmel.c-1305-\t * spi_register_master) but after all membmers of the cs_gpiod\n--\ndrivers/spi/spi-atmel.c=1550=static int atmel_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-atmel.c-1668-\ndrivers/spi/spi-atmel.c:1669:\tret = spi_register_controller(host);\ndrivers/spi/spi-atmel.c-1670-\tif (ret)\n--\ndrivers/spi/spi-axi-spi-engine.c=1104=static int spi_engine_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-axi-spi-engine.c-1239-\ndrivers/spi/spi-axi-spi-engine.c:1240:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-axi-spi-engine.c-1241-}\n--\ndrivers/spi/spi-axiado.c=752=static int ax_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-axiado.c-846-\ndrivers/spi/spi-axiado.c:847:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-axiado.c-848-\tif (ret) {\n--\ndrivers/spi/spi-bcm-qspi.c=1482=int bcm_qspi_probe(struct platform_device *pdev,\n--\ndrivers/spi/spi-bcm-qspi.c-1659-\ndrivers/spi/spi-bcm-qspi.c:1660:\tret = spi_register_controller(host);\ndrivers/spi/spi-bcm-qspi.c-1661-\tif (ret \u003c 0) {\n--\ndrivers/spi/spi-bcm2835.c=1349=static int bcm2835_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-bcm2835.c-1406-\ndrivers/spi/spi-bcm2835.c:1407:\terr = spi_register_controller(ctlr);\ndrivers/spi/spi-bcm2835.c-1408-\tif (err) {\n--\ndrivers/spi/spi-bcm2835aux.c=474=static int bcm2835aux_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-bcm2835aux.c-543-\ndrivers/spi/spi-bcm2835aux.c:544:\terr = spi_register_controller(host);\ndrivers/spi/spi-bcm2835aux.c-545-\tif (err) {\n--\ndrivers/spi/spi-bcm63xx-hsspi.c=742=static int bcm63xx_hsspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-bcm63xx-hsspi.c-857-\t/* register and we are done */\ndrivers/spi/spi-bcm63xx-hsspi.c:858:\tret = spi_register_controller(host);\ndrivers/spi/spi-bcm63xx-hsspi.c-859-\tif (ret)\n--\ndrivers/spi/spi-bcm63xx.c=491=static int bcm63xx_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-bcm63xx.c-599-\t/* register and we are done */\ndrivers/spi/spi-bcm63xx.c:600:\tret = spi_register_controller(host);\ndrivers/spi/spi-bcm63xx.c-601-\tif (ret) {\n--\ndrivers/spi/spi-bcmbca-hsspi.c=432=static int bcmbca_hsspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-bcmbca-hsspi.c-540-\t/* register and we are done */\ndrivers/spi/spi-bcmbca-hsspi.c:541:\tret = spi_register_controller(host);\ndrivers/spi/spi-bcmbca-hsspi.c-542-\tif (ret)\n--\ndrivers/spi/spi-bitbang.c=424=int spi_bitbang_start(struct spi_bitbang *bitbang)\n--\ndrivers/spi/spi-bitbang.c-435-\t */\ndrivers/spi/spi-bitbang.c:436:\treturn spi_register_controller(ctlr);\ndrivers/spi/spi-bitbang.c-437-}\n--\ndrivers/spi/spi-cadence-quadspi.c=1781=static int cqspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cadence-quadspi.c-1974-\ndrivers/spi/spi-cadence-quadspi.c:1975:\tret = spi_register_controller(host);\ndrivers/spi/spi-cadence-quadspi.c-1976-\tif (ret) {\n--\ndrivers/spi/spi-cadence-xspi.c=1174=static int cdns_xspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cadence-xspi.c-1287-\ndrivers/spi/spi-cadence-xspi.c:1288:\tret = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-cadence-xspi.c-1289-\tif (ret) {\n--\ndrivers/spi/spi-cadence.c=636=static int cdns_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cadence.c-742-\t}\ndrivers/spi/spi-cadence.c:743:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-cadence.c-744-\tif (ret) {\n--\ndrivers/spi/spi-cavium-octeon.c=19=static int octeon_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cavium-octeon.c-54-\ndrivers/spi/spi-cavium-octeon.c:55:\terr = spi_register_controller(host);\ndrivers/spi/spi-cavium-octeon.c-56-\tif (err) {\n--\ndrivers/spi/spi-cavium-thunderx.c=19=static int thunderx_spi_probe(struct pci_dev *pdev,\n--\ndrivers/spi/spi-cavium-thunderx.c-68-\ndrivers/spi/spi-cavium-thunderx.c:69:\treturn spi_register_controller(host);\ndrivers/spi/spi-cavium-thunderx.c-70-}\n--\ndrivers/spi/spi-ch341.c=141=static int ch341_probe(struct usb_interface *intf,\n--\ndrivers/spi/spi-ch341.c-202-\ndrivers/spi/spi-ch341.c:203:\tret = spi_register_controller(ctrl);\ndrivers/spi/spi-ch341.c-204-\tif (ret)\n--\ndrivers/spi/spi-clps711x.c=91=static int spi_clps711x_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-clps711x.c-137-\ndrivers/spi/spi-clps711x.c:138:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-clps711x.c-139-}\n--\ndrivers/spi/spi-coldfire-qspi.c=338=static int mcfqspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-coldfire-qspi.c-406-\ndrivers/spi/spi-coldfire-qspi.c:407:\tstatus = spi_register_controller(host);\ndrivers/spi/spi-coldfire-qspi.c-408-\tif (status) {\n--\ndrivers/spi/spi-cs42l43.c=312=static int cs42l43_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-cs42l43.c-409-\ndrivers/spi/spi-cs42l43.c:410:\tret = devm_spi_register_controller(priv-\u003edev, priv-\u003ectlr);\ndrivers/spi/spi-cs42l43.c-411-\tif (ret)\n--\ndrivers/spi/spi-dln2.c=680=static int dln2_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-dln2.c-758-\ndrivers/spi/spi-dln2.c:759:\tret = spi_register_controller(host);\ndrivers/spi/spi-dln2.c-760-\tif (ret \u003c 0) {\n--\ndrivers/spi/spi-dw-core.c=923=int dw_spi_add_controller(struct device *dev, struct dw_spi *dws)\n--\ndrivers/spi/spi-dw-core.c-1003-\ndrivers/spi/spi-dw-core.c:1004:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-dw-core.c-1005-\tif (ret) {\n--\ndrivers/spi/spi-ep93xx.c=623=static int ep93xx_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-ep93xx.c-692-\ndrivers/spi/spi-ep93xx.c:693:\terror = spi_register_controller(host);\ndrivers/spi/spi-ep93xx.c-694-\tif (error) {\n--\ndrivers/spi/spi-falcon.c=391=static int falcon_sflash_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-falcon.c-407-\ndrivers/spi/spi-falcon.c:408:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-falcon.c-409-}\n--\ndrivers/spi/spi-fsi.c=531=static int fsi_spi_probe(struct fsi_device *fsi)\n--\ndrivers/spi/spi-fsi.c-571-\ndrivers/spi/spi-fsi.c:572:\t\trc = devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-fsi.c-573-\t\tif (rc)\n--\ndrivers/spi/spi-fsl-dspi.c=1528=static int dspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-fsl-dspi.c-1680-\ndrivers/spi/spi-fsl-dspi.c:1681:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-fsl-dspi.c-1682-\tif (ret != 0) {\n--\ndrivers/spi/spi-fsl-espi.c=663=static int fsl_espi_probe(struct device *dev, struct resource *mem,\n--\ndrivers/spi/spi-fsl-espi.c-717-\ndrivers/spi/spi-fsl-espi.c:718:\tret = spi_register_controller(host);\ndrivers/spi/spi-fsl-espi.c-719-\tif (ret \u003c 0)\n--\ndrivers/spi/spi-fsl-lpspi.c=892=static int fsl_lpspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-fsl-lpspi.c-1003-\ndrivers/spi/spi-fsl-lpspi.c:1004:\tret = spi_register_controller(controller);\ndrivers/spi/spi-fsl-lpspi.c-1005-\tif (ret \u003c 0) {\n--\ndrivers/spi/spi-fsl-qspi.c=894=static int fsl_qspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-fsl-qspi.c-988-\ndrivers/spi/spi-fsl-qspi.c:989:\tret = devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-fsl-qspi.c-990-\tif (ret)\n--\ndrivers/spi/spi-fsl-spi.c=528=static struct spi_controller *fsl_spi_probe(struct device *dev,\n--\ndrivers/spi/spi-fsl-spi.c-616-\ndrivers/spi/spi-fsl-spi.c:617:\tret = spi_register_controller(host);\ndrivers/spi/spi-fsl-spi.c-618-\tif (ret \u003c 0)\n--\ndrivers/spi/spi-geni-qcom.c=1042=static int spi_geni_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-geni-qcom.c-1149-\ndrivers/spi/spi-geni-qcom.c:1150:\treturn devm_spi_register_controller(dev, spi);\ndrivers/spi/spi-geni-qcom.c-1151-}\n--\ndrivers/spi/spi-gpio.c=339=static int spi_gpio_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-gpio.c-412-\ndrivers/spi/spi-gpio.c:413:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-gpio.c-414-}\n--\ndrivers/spi/spi-gxp.c=250=static int gxp_spifi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-gxp.c-287-\ndrivers/spi/spi-gxp.c:288:\tret = devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-gxp.c-289-\tif (ret) {\n--\ndrivers/spi/spi-hisi-kunpeng.c=461=static int hisi_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-hisi-kunpeng.c-523-\ndrivers/spi/spi-hisi-kunpeng.c:524:\tret = spi_register_controller(host);\ndrivers/spi/spi-hisi-kunpeng.c-525-\tif (ret)\n--\ndrivers/spi/spi-hisi-sfc-v3xx.c=430=static int hisi_sfc_v3xx_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-hisi-sfc-v3xx.c-496-\ndrivers/spi/spi-hisi-sfc-v3xx.c:497:\tret = devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-hisi-sfc-v3xx.c-498-\tif (ret)\n--\ndrivers/spi/spi-img-spfi.c=525=static int img_spfi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-img-spfi.c-641-\ndrivers/spi/spi-img-spfi.c:642:\tret = spi_register_controller(host);\ndrivers/spi/spi-img-spfi.c-643-\tif (ret)\n--\ndrivers/spi/spi-imx.c=2219=static int spi_imx_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-imx.c-2359-\ndrivers/spi/spi-imx.c:2360:\tret = spi_register_controller(controller);\ndrivers/spi/spi-imx.c-2361-\tif (ret) {\n--\ndrivers/spi/spi-ingenic.c=383=static int spi_ingenic_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-ingenic.c-454-\ndrivers/spi/spi-ingenic.c:455:\tret = devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-ingenic.c-456-\tif (ret)\n--\ndrivers/spi/spi-intel.c=1489=int intel_spi_probe(struct device *dev, void __iomem *base,\n--\ndrivers/spi/spi-intel.c-1512-\ndrivers/spi/spi-intel.c:1513:\tret = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-intel.c-1514-\tif (ret)\n--\ndrivers/spi/spi-jcore.c=141=static int jcore_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-jcore.c-201-\t/* Register our spi controller */\ndrivers/spi/spi-jcore.c:202:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-jcore.c-203-}\n--\ndrivers/spi/spi-kspi2.c=338=static int kspi2_probe(struct auxiliary_device *auxdev,\n--\ndrivers/spi/spi-kspi2.c-392-\thost-\u003etransfer_one = kspi2_transfer_one;\ndrivers/spi/spi-kspi2.c:393:\tret = devm_spi_register_controller(dev, host);\ndrivers/spi/spi-kspi2.c-394-\tif (ret) {\n--\ndrivers/spi/spi-lantiq-ssc.c=904=static int lantiq_ssc_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-lantiq-ssc.c-990-\ndrivers/spi/spi-lantiq-ssc.c:991:\terr = spi_register_controller(host);\ndrivers/spi/spi-lantiq-ssc.c-992-\tif (err) {\n--\ndrivers/spi/spi-ljca.c=218=static int ljca_spi_probe(struct auxiliary_device *auxdev,\n--\ndrivers/spi/spi-ljca.c-242-\ndrivers/spi/spi-ljca.c:243:\tret = spi_register_controller(controller);\ndrivers/spi/spi-ljca.c-244-\tif (ret)\n--\ndrivers/spi/spi-loongson-core.c=196=int loongson_spi_init_controller(struct device *dev, void __iomem *regs)\n--\ndrivers/spi/spi-loongson-core.c-227-\ndrivers/spi/spi-loongson-core.c:228:\treturn devm_spi_register_controller(dev, controller);\ndrivers/spi/spi-loongson-core.c-229-}\n--\ndrivers/spi/spi-lp8841-rtc.c=182=spi_lp8841_rtc_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-lp8841-rtc.c-212-\t/* register with the SPI framework */\ndrivers/spi/spi-lp8841-rtc.c:213:\tret = devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-lp8841-rtc.c-214-\tif (ret) {\n--\ndrivers/spi/spi-meson-spicc.c=978=static int meson_spicc_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-meson-spicc.c-1074-\ndrivers/spi/spi-meson-spicc.c:1075:\tret = spi_register_controller(host);\ndrivers/spi/spi-meson-spicc.c-1076-\tif (ret) {\n--\ndrivers/spi/spi-meson-spifc.c=285=static int meson_spifc_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-meson-spifc.c-330-\ndrivers/spi/spi-meson-spifc.c:331:\tret = devm_spi_register_controller(spifc-\u003edev, host);\ndrivers/spi/spi-meson-spifc.c-332-\tif (ret) {\n--\ndrivers/spi/spi-microchip-core-qspi.c=719=static int mchp_coreqspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-microchip-core-qspi.c-792-\ndrivers/spi/spi-microchip-core-qspi.c:793:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-microchip-core-qspi.c-794-\tif (ret)\n--\ndrivers/spi/spi-microchip-core-spi.c=287=static int mchp_corespi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-microchip-core-spi.c-386-\ndrivers/spi/spi-microchip-core-spi.c:387:\tret = spi_register_controller(host);\ndrivers/spi/spi-microchip-core-spi.c-388-\tif (ret) {\n--\ndrivers/spi/spi-mpc512x-psc.c=458=static int mpc512x_psc_spi_of_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mpc512x-psc.c-513-\ndrivers/spi/spi-mpc512x-psc.c:514:\treturn devm_spi_register_controller(dev, host);\ndrivers/spi/spi-mpc512x-psc.c-515-}\n--\ndrivers/spi/spi-mpc52xx-psc.c=294=static int mpc52xx_psc_spi_of_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mpc52xx-psc.c-343-\ndrivers/spi/spi-mpc52xx-psc.c:344:\treturn devm_spi_register_controller(dev, host);\ndrivers/spi/spi-mpc52xx-psc.c-345-}\n--\ndrivers/spi/spi-mpc52xx.c=387=static int mpc52xx_spi_probe(struct platform_device *op)\n--\ndrivers/spi/spi-mpc52xx.c-492-\tdev_dbg(\u0026op-\u003edev, \"registering spi_controller struct\\n\");\ndrivers/spi/spi-mpc52xx.c:493:\trc = spi_register_controller(host);\ndrivers/spi/spi-mpc52xx.c-494-\tif (rc)\n--\ndrivers/spi/spi-mpfs.c=527=static int mpfs_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mpfs.c-576-\ndrivers/spi/spi-mpfs.c:577:\tret = spi_register_controller(host);\ndrivers/spi/spi-mpfs.c-578-\tif (ret) {\n--\ndrivers/spi/spi-mt65xx.c=1175=static int mtk_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mt65xx.c-1327-\ndrivers/spi/spi-mt65xx.c:1328:\tret = spi_register_controller(host);\ndrivers/spi/spi-mt65xx.c-1329-\tif (ret) {\n--\ndrivers/spi/spi-mt7621.c=316=static int mt7621_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mt7621.c-369-\ndrivers/spi/spi-mt7621.c:370:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, host);\ndrivers/spi/spi-mt7621.c-371-}\n--\ndrivers/spi/spi-mtk-nor.c=810=static int mtk_nor_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mtk-nor.c-915-\ndrivers/spi/spi-mtk-nor.c:916:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-mtk-nor.c-917-\tif (ret \u003c 0)\n--\ndrivers/spi/spi-mtk-snfi.c=1338=static int mtk_snand_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mtk-snfi.c-1464-\tctlr-\u003emode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;\ndrivers/spi/spi-mtk-snfi.c:1465:\tret = spi_register_controller(ctlr);\ndrivers/spi/spi-mtk-snfi.c-1466-\tif (ret) {\n--\ndrivers/spi/spi-mux.c=126=static int spi_mux_probe(struct spi_device *spi)\n--\ndrivers/spi/spi-mux.c-164-\ndrivers/spi/spi-mux.c:165:\treturn devm_spi_register_controller(\u0026spi-\u003edev, ctlr);\ndrivers/spi/spi-mux.c-166-}\n--\ndrivers/spi/spi-mxic.c=755=static int mxic_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mxic.c-819-\ndrivers/spi/spi-mxic.c:820:\tret = spi_register_controller(host);\ndrivers/spi/spi-mxic.c-821-\tif (ret) {\n--\ndrivers/spi/spi-mxs.c=528=static int mxs_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-mxs.c-620-\ndrivers/spi/spi-mxs.c:621:\tret = spi_register_controller(host);\ndrivers/spi/spi-mxs.c-622-\tif (ret) {\n--\ndrivers/spi/spi-npcm-fiu.c=689=static int npcm_fiu_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-npcm-fiu.c-746-\ndrivers/spi/spi-npcm-fiu.c:747:\treturn devm_spi_register_controller(dev, ctrl);\ndrivers/spi/spi-npcm-fiu.c-748-}\n--\ndrivers/spi/spi-npcm-pspi.c=340=static int npcm_pspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-npcm-pspi.c-412-\ndrivers/spi/spi-npcm-pspi.c:413:\tret = spi_register_controller(host);\ndrivers/spi/spi-npcm-pspi.c-414-\tif (ret)\n--\ndrivers/spi/spi-nxp-fspi.c=1286=static int nxp_fspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-nxp-fspi.c-1390-\ndrivers/spi/spi-nxp-fspi.c:1391:\treturn devm_spi_register_controller(\u0026pdev-\u003edev, ctlr);\ndrivers/spi/spi-nxp-fspi.c-1392-}\n--\ndrivers/spi/spi-nxp-xspi.c=1208=static int nxp_xspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-nxp-xspi.c-1290-\ndrivers/spi/spi-nxp-xspi.c:1291:\treturn devm_spi_register_controller(dev, ctlr);\ndrivers/spi/spi-nxp-xspi.c-1292-}\n--\ndrivers/spi/spi-omap2-mcspi.c=1474=static int omap2_mcspi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-omap2-mcspi.c-1589-\ndrivers/spi/spi-omap2-mcspi.c:1590:\tstatus = spi_register_controller(ctlr);\ndrivers/spi/spi-omap2-mcspi.c-1591-\tif (status \u003c 0)\n--\ndrivers/spi/spi-orion.c=644=static int orion_spi_probe(struct platform_device *pdev)\n--\ndrivers/spi/spi-orion.c-778-\ndrivers/spi/spi-orion.c:779:\tstatus = spi_register_controller(host);\ndrivers/spi/spi-orion.c-780-\tif (status \u003c 0)\n--\ndrivers/spi/spi-pci1xxxx.c=800=static int pci1xxxx_spi_probe(struct pci_dev *pdev, const struct pci_device_id *ent)\n--\ndrivers/spi/spi-pci1xxxx.c-931-\t\tspi_controller_set_devdata(spi_host, spi_sub_ptr);\ndrivers/spi/spi-pci1xxxx.c:932:\t\tret = devm_spi_register_controller(dev, spi_host);\ndrivers/spi/spi-pci1xxxx.c-933-\t\tif (ret)\n--\ndrivers/spi/spi-pic32-sqi.c=569=static int pic32_sqi_probe(struct platform_device *pdev)\n--\n\n"
} |
| 77/2 | 2026/09/28 12:32 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 67067 output: 37 thoughts: 49 Thoughts: Okay, here's my interpretation of that thought process, tailored for an expert audience: **Diving into the msi2500 Driver** Hold on a second! My attention is immediately drawn to `drivers/media/usb/msi2500/msi2500.c`. I need to understand what this driver is doing. My immediate question is: does this msi2500 driver present a SPI interface to the system? I need to quickly determine the underlying hardware configuration this driver manages. That's the critical first step for understanding its role and potential for integration or modification within a larger system. |
| 78/2 | 2026/09/28 12:32 | tool | grepper |
0mError:no matches Args: {
"Expression": "spi_new_device",
"PathPrefix": "drivers/media/usb/msi2500"
}Results: {
"error": "no matches"
} |
| 79/2 | 2026/09/28 12:32 | llm | patch-evaluator-compressor |
42mModel:gemini-3.8-flash Args: null Results: null Reply: ### Investigation Summary: Patch Evaluation for MAX3100 UART Driver
#### 1. Approaches Tried and Results
- **Analyzed Diff:**
- Patch modifies `drivers/tty/serial/max3100.c`:
- `max3100_shutdown(struct uart_port *port)`: Reordered teardown so `free_irq(port->irq, s)` and `cancel_work_sync(&s->work)` occur inside `if (s->workqueue)` before `destroy_workqueue(s->workqueue)`.
- `max3100_remove(struct spi_device *spi)`: Added teardown logic after `uart_remove_one_port()`:
```c
s->force_end_work = 1;
timer_shutdown_sync(&s->timer);
if (s->workqueue) {
free_irq(s->port.irq, s);
cancel_work_sync(&s->work);
destroy_workqueue(s->workqueue);
s->workqueue = NULL;
}
```
- **Kconfig and Build System Inspection:**
- `CONFIG_SERIAL_MAX3100` (`tristate "MAX3100/3110/3111/3222 support"`), `depends on SPI`, `select SERIAL_CORE`.
- Compiled in `drivers/tty/serial/Makefile` as `max3100.o`.
- **Driver Model and Registration Inspection:**
- `max3100_driver` is a `struct spi_driver` matching `max3100` (SPI ID) and `maxim,max3100` (OF compatible string).
- Probe routine: `max3100_probe(struct spi_device *spi)`. It registers a UART driver (`max3100_uart_driver`, dev_name `ttyMAX`), initializes timer, port configuration, attempts to read device property `"clock-frequency"`, calls `uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port)`.
- Operations: `max3100_ops` (struct `uart_ops`) contains `.shutdown = max3100_shutdown`.
- **Reachability Analysis for SPI Devices in Standard Virtualized Environments (QEMU / GCE / amd64):**
- Examined whether user-space can instantiate arbitrary SPI slave devices (equivalent to I2C's sysfs `new_device`):
- `drivers/spi` does not provide a sysfs `new_device` attribute (unlike I2C).
- `drivers/spi/spi.c` only instantiates child devices via `of_register_spi_devices` (Device Tree) or `acpi_register_spi_devices` (ACPI tables), or hard-coded board info via `spi_new_device`.
- Checked USB-to-SPI bridges:
- E.g., `spi-ch341.c`: registers hardcoded child device `.modalias = "spi-ch341a"`.
- Checked `spi-virtio.c`: only calls `devm_spi_register_controller()`, which relies on OF/ACPI for child device enumeration; does not expose arbitrary slave device creation.
- Checked `uart_add_one_port` and serial core:
- `uart_add_one_port` -> `serial_ctrl_register_port` -> `serial_core_register_port` -> `serial_core_add_one_port`. While serial core itself doesn't reject `uartclk == 0`, reaching `max3100_probe` requires an `spi_device` bound to `max3100`.
#### 2. Current Hypotheses and Theories
- **Hypothesis: MAX3100 is structurally unreachable on amd64 in standard virtualized environments (QEMU / GCE):**
- The MAX3100 is an external SPI UART chip requiring physical hardware or explicit SPI controller + slave bus emulation in the ACPI/DT topology.
- On standard x86_64 QEMU/GCE instances, no MAX3100 SPI device exists in ACPI or platform firmware.
- Unlike USB, raw gadget, or I2C (via sysfs `new_device`), SPI has no generic user-accessible interface to instantiate arbitrary SPI client devices from userspace.
- Furthermore, `max3100_remove` is a bus teardown callback (.remove callback of `spi_driver`), matching Section 2 negative criteria: "Unreachable execution paths: Driver teardown callbacks (.remove, .shutdown, pci_unregister_driver)..."
- `max3100_shutdown` is a `uart_ops` callback, but can only ever run if a `/dev/ttyMAXn` device was probed and opened, which requires probing an SPI `max3100` device.
- Therefore, the modified code is structurally unreachable under standard QEMU/GCE fuzzing environments.
#### 3. Key Files, Functions, and Symbols
- `drivers/tty/serial/max3100.c`:
- `max3100_shutdown` (line 535)
- `max3100_remove` (line 752)
- `max3100_probe` (line 684)
- `max3100_ops` (line 655)
- `max3100_driver` (line 833)
- `drivers/tty/serial/Kconfig`:
- `CONFIG_SERIAL_MAX3100` (line 312, depends on `SPI`)
- `drivers/spi/spi.c`:
- `spi_register_controller`: registers OF / ACPI devices; no sysfs `new_device` interface.
#### 4. Watch Out for Loops / Repetitive Actions
- Avoid further repetitive search for dynamic SPI device creation in sysfs or serial core; it has been confirmed that SPI core does not implement a sysfs `new_device` attribute.
- Final step will be invoking `set-results` with `WorthFuzzing=false` (or determining if any edge-case virtual SPI path exists).Tokens: input: 46511 output: 1439 thoughts: 0 |
| 80/2 | 2026/09/28 13:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21253 output: 29 thoughts: 0 |
| 81/2 | 2026/09/28 13:15 | tool | grepper |
0mArgs:{
"Expression": "spi_new_device",
"PathPrefix": "drivers/media/"
}Results: {
"Output": "drivers/media/pci/mgb4/mgb4_core.c=161=static int init_spi(struct mgb4_dev *mgbdev, u32 devid)\n--\ndrivers/media/pci/mgb4/mgb4_core.c-247-\ndrivers/media/pci/mgb4/mgb4_core.c:248:\tspi_dev = spi_new_device(ctlr, \u0026spi_info);\ndrivers/media/pci/mgb4/mgb4_core.c-249-\tput_device(\u0026ctlr-\u003edev);\n--\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c=173=int netup_spi_init(struct netup_unidvb_dev *ndev)\n--\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c-209-\t\tndev-\u003epci_func);\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c:210:\tif (!spi_new_device(ctlr, \u0026netup_spi_board)) {\ndrivers/media/pci/netup_unidvb/netup_unidvb_spi.c-211-\t\tspi_unregister_controller(ctlr);\n--\ndrivers/media/v4l2-core/v4l2-spi.c=36=struct v4l2_subdev *v4l2_spi_new_subdev(struct v4l2_device *v4l2_dev,\n--\ndrivers/media/v4l2-core/v4l2-spi.c-47-\ndrivers/media/v4l2-core/v4l2-spi.c:48:\tspi = spi_new_device(ctlr, info);\ndrivers/media/v4l2-core/v4l2-spi.c-49-\n"
} |
| 82/2 | 2026/09/28 13:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 21779 output: 29 thoughts: 0 |
| 83/2 | 2026/09/28 13:15 | tool | grepper |
0mArgs:{
"Expression": "\"max3100\"",
"PathPrefix": "drivers/"
}Results: {
"Output": "drivers/tty/serial/max3100.c=548=static int max3100_startup(struct uart_port *port)\n--\ndrivers/tty/serial/max3100.c-574-\ndrivers/tty/serial/max3100.c:575:\tret = request_irq(port-\u003eirq, max3100_irq, IRQF_TRIGGER_FALLING, \"max3100\", s);\ndrivers/tty/serial/max3100.c-576-\tif (ret \u003c 0) {\n--\ndrivers/tty/serial/max3100.c=821=static const struct spi_device_id max3100_spi_id[] = {\ndrivers/tty/serial/max3100.c:822:\t{ \"max3100\" },\ndrivers/tty/serial/max3100.c-823-\t{ }\n--\ndrivers/tty/serial/max3100.c=833=static struct spi_driver max3100_driver = {\ndrivers/tty/serial/max3100.c-834-\t.driver = {\ndrivers/tty/serial/max3100.c:835:\t\t.name\t\t= \"max3100\",\ndrivers/tty/serial/max3100.c-836-\t\t.of_match_table\t= max3100_of_match,\n"
} |
| 84/2 | 2026/09/28 13:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22183 output: 23 thoughts: 0 |
| 85/2 | 2026/09/28 13:15 | tool | grepper |
0mArgs:{
"Expression": "\"maxim,max3100\""
}Results: {
"Output": "drivers/tty/serial/max3100.c=827=static const struct of_device_id max3100_of_match[] = {\ndrivers/tty/serial/max3100.c:828:\t{ .compatible = \"maxim,max3100\" },\ndrivers/tty/serial/max3100.c-829-\t{ }\n"
} |
| 86/2 | 2026/09/28 13:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22313 output: 23 thoughts: 0 |
| 87/2 | 2026/09/28 13:15 | tool | grepper |
0mArgs:{
"Expression": "CONFIG_SERIAL_MAX3100"
}Results: {
"Output": "drivers/tty/serial/Makefile=49=obj-$(CONFIG_SERIAL_HS_LPC32XX)\t\t+= lpc32xx_hs.o\ndrivers/tty/serial/Makefile:50:obj-$(CONFIG_SERIAL_MAX3100)\t\t+= max3100.o\ndrivers/tty/serial/Makefile-51-obj-$(CONFIG_SERIAL_MAX310X)\t\t+= max310x.o\n"
} |
| 88/2 | 2026/09/28 13:15 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22454 output: 35 thoughts: 0 |
| 89/2 | 2026/09/28 13:16 | tool | grepper |
0mArgs:{
"Expression": "SERIAL_MAX3100",
"PathPrefix": "drivers/tty/serial/Kconfig"
}Results: {
"Output": "drivers/tty/serial/Kconfig=299=config SERIAL_TEGRA_UTC_CONSOLE\n--\ndrivers/tty/serial/Kconfig-311-\ndrivers/tty/serial/Kconfig:312:config SERIAL_MAX3100\ndrivers/tty/serial/Kconfig-313-\ttristate \"MAX3100/3110/3111/3222 support\"\n"
} |
| 90/2 | 2026/09/28 13:16 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22603 output: 36 thoughts: 0 |
| 91/2 | 2026/09/28 13:16 | tool | read-file |
0mArgs:{
"File": "drivers/tty/serial/Kconfig",
"FirstLine": 312,
"LineCount": 15
}Results: {
"Contents": " 312:\tconfig SERIAL_MAX3100\n 313:\t\ttristate \"MAX3100/3110/3111/3222 support\"\n 314:\t\tdepends on SPI\n 315:\t\tselect SERIAL_CORE\n 316:\t\thelp\n 317:\t\t This selects support for an advanced UART from Maxim.\n 318:\t\t Supported ICs are MAX3100, MAX3110, MAX3111, MAX3222.\n 319:\t\n 320:\t\t Say Y here if you want to support these ICs.\n 321:\t\n 322:\tconfig SERIAL_MAX310X\n 323:\t\ttristate \"MAX310X support\"\n 324:\t\tdepends on (SPI_MASTER \u0026\u0026 !I2C) || I2C\n 325:\t\tselect SERIAL_CORE\n 326:\t\tselect REGMAP_SPI if SPI_MASTER\n"
} |
| 92/2 | 2026/09/28 13:16 | llm | patch-evaluator |
0mModel:gemini-3.8-flash Args: null Results: null Tokens: input: 22901 output: 185 thoughts: 0 |
| 93/2 | 2026/09/28 13:16 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"SERIAL_MAX3100",
"SPI"
],
"FocusSymbols": [],
"Reasoning": "The patch modifies max3100_shutdown() and max3100_remove() in drivers/tty/serial/max3100.c, which is a driver for the Maxim MAX3100 SPI-attached UART chip. In standard virtualized environments (e.g. QEMU/GCE on amd64), there is no emulated MAX3100 hardware, and the SPI subsystem does not provide a userspace-accessible mechanism (such as sysfs new_device) to dynamically instantiate arbitrary SPI slave devices. Furthermore, max3100_remove() is a driver removal callback. Therefore, the modified code is structurally unreachable.",
"WorthFuzzing": false
}Results: {
"EnableConfigs": [
"SERIAL_MAX3100",
"SPI"
],
"FocusSymbols": [],
"Reasoning": "The patch modifies max3100_shutdown() and max3100_remove() in drivers/tty/serial/max3100.c, which is a driver for the Maxim MAX3100 SPI-attached UART chip. In standard virtualized environments (e.g. QEMU/GCE on amd64), there is no emulated MAX3100 hardware, and the SPI subsystem does not provide a userspace-accessible mechanism (such as sysfs new_device) to dynamically instantiate arbitrary SPI slave devices. Furthermore, max3100_remove() is a driver removal callback. Therefore, the modified code is structurally unreachable.",
"WorthFuzzing": false
} |
| 94/1 | 2026/09/28 13:16 | action | If |
0mArgs:{
"WorthFuzzing": false
}Results: null |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|