If a device is in an error state, then any reads of device registers can return error value. Add addtional checks to validate if a device is in an error state before doing an flr reset. Signed-off-by: Farhan Ali --- drivers/pci/pci.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 4b67d22faf0a..3994fa82df68 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4580,12 +4580,19 @@ EXPORT_SYMBOL_GPL(pcie_flr); */ int pcie_reset_flr(struct pci_dev *dev, bool probe) { + u32 reg; + if (dev->dev_flags & PCI_DEV_FLAGS_NO_FLR_RESET) return -ENOTTY; if (!(dev->devcap & PCI_EXP_DEVCAP_FLR)) return -ENOTTY; + if (pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, ®)) { + pci_warn(dev, "Device unable to do an FLR\n"); + return -ENOTTY; + } + if (probe) return 0; -- 2.43.0