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authorBart Van Assche <bart.vanassche@sandisk.com>2016-08-16 16:48:36 -0700
committerSasha Levin <alexander.levin@verizon.com>2016-08-31 19:21:09 -0400
commit26390c7073a70d57c5c0de7c44f909fc91f3c66b (patch)
tree1b29dec931fdad55366a78954480d3819464dfdb /block
parent0df5268514aafd144b5b0402d03a21951961fa9f (diff)
block: Fix race triggered by blk_set_queue_dying()
[ Upstream commit 1b856086813be9371929b6cc62045f9fd470f5a0 ] blk_set_queue_dying() can be called while another thread is submitting I/O or changing queue flags, e.g. through dm_stop_queue(). Hence protect the QUEUE_FLAG_DYING flag change with locking. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Mike Snitzer <snitzer@redhat.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 7f29dc0237d1..bbbf36e6066b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -475,7 +475,9 @@ EXPORT_SYMBOL_GPL(blk_queue_bypass_end);
void blk_set_queue_dying(struct request_queue *q)
{
- queue_flag_set_unlocked(QUEUE_FLAG_DYING, q);
+ spin_lock_irq(q->queue_lock);
+ queue_flag_set(QUEUE_FLAG_DYING, q);
+ spin_unlock_irq(q->queue_lock);
if (q->mq_ops)
blk_mq_wake_waiters(q);