Haoze Xie 2957771379 rust: block: fix GenDisk cleanup paths ...

GenDiskBuilder::build() still has fallible work after
__blk_mq_alloc_disk(), but its error path only recovers the
foreign queue data. That leaks the temporary gendisk and
request_queue until later teardown. If the caller moved the last
Arc<TagSet<T>> into build(), the leaked queue can retain blk-mq
state after the tag set is dropped.

Fix the pre-registration failure path by dropping the temporary
gendisk reference with put_disk() before recovering queue_data,
so disk_release() can tear down the owned queue.

Also pair GenDisk::drop() with put_disk() after del_gendisk().
Once a Rust GenDisk has been added with device_add_disk(),
del_gendisk() only unregisters it; the final gendisk reference
still has to be dropped to complete the release path.

Fixes: 3253aba340 ("rust: block: introduce `kernel::block::mq` module")
Cc: [email protected]
Reported-by: Yuan Tan <[email protected]>
Reported-by: Xin Liu <[email protected]>
Reviewed-by: Andreas Hindborg <[email protected]>
Signed-off-by: Haoze Xie <[email protected]>
Signed-off-by: Ren Wei <[email protected]>
Link: https://patch.msgid.link/b70aff9a920cc42110fe5cf454c3099561863519.1780063368.git.royenheart@gmail.com
Signed-off-by: Jens Axboe <[email protected]>

2026-05-31 19:45:06 -06:00

..

mq

rust: block: fix GenDisk cleanup paths

2026-05-31 19:45:06 -06:00

mq.rs

rust: block: update ARef and AlwaysRefCounted imports from sync::aref

2025-11-05 18:24:10 -07:00