[5/8] block: Reduce sysfs_lock locking inside blk_cleanup_queue()
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Message ID 20190930230047.44113-6-bvanassche@acm.org
State New
Headers show
Series
  • Block layer patches for kernel v5.5
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Commit Message

Bart Van Assche Sept. 30, 2019, 11 p.m. UTC
Since blk_cleanup_queue() is called after blk_unregister_queue() and
since that last function removes all sysfs attributes, serializing
any code in blk_cleanup_queue() against sysfs callback methods nor against
I/O scheduler changes is necessary. Hence remove the syfs_lock locking
calls from the start of blk_cleanup_queue().

Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 block/blk-core.c | 2 --
 1 file changed, 2 deletions(-)

Patch
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diff --git a/block/blk-core.c b/block/blk-core.c
index 8b51d9ec8ae3..ae506ac2dd48 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -339,13 +339,11 @@  void blk_cleanup_queue(struct request_queue *q)
 	WARN_ON_ONCE(blk_queue_registered(q));
 
 	/* mark @q DYING, no new request or merges will be allowed afterwards */
-	mutex_lock(&q->sysfs_lock);
 	blk_set_queue_dying(q);
 
 	blk_queue_flag_set(QUEUE_FLAG_NOMERGES, q);
 	blk_queue_flag_set(QUEUE_FLAG_NOXMERGES, q);
 	blk_queue_flag_set(QUEUE_FLAG_DYING, q);
-	mutex_unlock(&q->sysfs_lock);
 
 	/*
 	 * Drain all requests queued before DYING marking. Set DEAD flag to