Change the return type of `Operations::queue_rq` from `Result` to
`BlkResult`. This ensures that drivers return proper block layer status
codes that can be translated to the appropriate `blk_status_t` value.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 drivers/block/rnull/rnull.rs       | 3 ++-
 rust/kernel/block/mq.rs            | 4 ++--
 rust/kernel/block/mq/operations.rs | 7 +++++--
 3 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/block/rnull/rnull.rs b/drivers/block/rnull/rnull.rs
index 034ddc06eabf9..55cbdfed25414 100644
--- a/drivers/block/rnull/rnull.rs
+++ b/drivers/block/rnull/rnull.rs
@@ -20,6 +20,7 @@
             BadBlocks, //
         },
         bio::Segment,
+        error::BlkResult,
         mq::{
             self,
             gen_disk::{
@@ -577,7 +578,7 @@ fn queue_rq(
         this: Pin<&Self>,
         rq: Owned<mq::IdleRequest<Self>>,
         _is_last: bool,
-    ) -> Result {
+    ) -> BlkResult {
         let mut rq = rq.start();
         let mut sectors = rq.sectors();
 
diff --git a/rust/kernel/block/mq.rs b/rust/kernel/block/mq.rs
index a898dda2635e5..02738f52389ba 100644
--- a/rust/kernel/block/mq.rs
+++ b/rust/kernel/block/mq.rs
@@ -64,7 +64,7 @@
 //! ```rust
 //! use kernel::{
 //!     bindings,
-//!     block::mq::{self, *},
+//!     block::{error::BlkResult, mq::{self, *}},
 //!     new_mutex,
 //!     prelude::*,
 //!     sync::{aref::ARef, Arc, Mutex},
@@ -90,7 +90,7 @@
 //!         _queue_data: (),
 //!         rq: Owned<IdleRequest<Self>>,
 //!         _is_last: bool
-//!     ) -> Result {
+//!     ) -> BlkResult {
 //!         rq.start().end_ok();
 //!         Ok(())
 //!     }
diff --git a/rust/kernel/block/mq/operations.rs b/rust/kernel/block/mq/operations.rs
index fb75d65f67071..17468a39af60f 100644
--- a/rust/kernel/block/mq/operations.rs
+++ b/rust/kernel/block/mq/operations.rs
@@ -6,7 +6,10 @@
 
 use crate::{
     bindings,
-    block::mq::{request::RequestDataWrapper, IdleRequest, Request},
+    block::{
+        error::BlkResult,
+        mq::{request::RequestDataWrapper, IdleRequest, Request},
+    },
     error::{from_result, Result},
     prelude::*,
     sync::{aref::ARef, atomic::ordering, Refcount},
@@ -62,7 +65,7 @@ fn queue_rq(
         queue_data: ForeignBorrowed<'_, Self::QueueData>,
         rq: Owned<IdleRequest<Self>>,
         is_last: bool,
-    ) -> Result;
+    ) -> BlkResult;
 
     /// Called by the kernel to indicate that queued requests should be submitted.
     fn commit_rqs(

-- 
2.51.2