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block: simplify calling convention of elv_unregister_queue() 

Make elv_unregister_queue() a no-op if q->elevator is NULL or is not
registered.

This simplifies the existing callers, as well as the future caller in
the error path of blk_register_queue().

Also don't bother checking whether q is NULL, since it never is.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220124215938.2769-2-ebiggers@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eric Biggers 2022-01-24 13:59:36 -08:00 committed by Jens Axboe
parent 483546c11d
commit f5ec592dd3
2 changed files with 5 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
block/blk-sysfs.c
View File

@ -960,8 +960,7 @@ void blk_unregister_queue(struct gendisk *disk)
blk_trace_remove_sysfs(disk_to_dev(disk));
mutex_lock(&q->sysfs_lock);
if (q->elevator)
elv_unregister_queue(q);
elv_unregister_queue(q);
disk_unregister_independent_access_ranges(disk);
mutex_unlock(&q->sysfs_lock);
mutex_unlock(&q->sysfs_dir_lock);

8
block/elevator.c
View File

@ -516,9 +516,11 @@ int elv_register_queue(struct request_queue *q, bool uevent)
void elv_unregister_queue(struct request_queue *q)
{
struct elevator_queue *e = q->elevator;
lockdep_assert_held(&q->sysfs_lock);
if (q) {
if (e && e->registered) {
struct elevator_queue *e = q->elevator;
kobject_uevent(&e->kobj, KOBJ_REMOVE);
@ -593,9 +595,7 @@ int elevator_switch_mq(struct request_queue *q,
lockdep_assert_held(&q->sysfs_lock);
if (q->elevator) {
if (q->elevator->registered)
elv_unregister_queue(q);
elv_unregister_queue(q);
ioc_clear_queue(q);
blk_mq_sched_free_rqs(q);
elevator_exit(q);