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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2016-08-16 16:48:36 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-15 08:20:26 +0200 |
| commit | 014146e4370fc132314f5015d74b940d1a4bf930 (patch) | |
| tree | a683794185004014faf4f06e0d69ad1e8a45791c | |
| parent | c9274d891869880648c4ee9365df3ecc7ba2e285 (diff) | |
| download | linux-stable-014146e4370fc132314f5015d74b940d1a4bf930.tar.gz linux-stable-014146e4370fc132314f5015d74b940d1a4bf930.tar.bz2 linux-stable-014146e4370fc132314f5015d74b940d1a4bf930.zip | |
block: Fix race triggered by blk_set_queue_dying()
commit 1b856086813be9371929b6cc62045f9fd470f5a0 upstream.
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>
Signed-off-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | block/blk-core.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 2475b1c72773..b993f88280a9 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -515,7 +515,9 @@ 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); |