block: add a read barrier in blk_queue_enter()

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Without the barrier, reading DEAD flag of .q_usage_counter
and reading .mq_freeze_depth may be reordered, then the
following wait_event_interruptible() may never return.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Ming Lei 2017-03-27 20:06:56 +08:00 • committed by Jens Axboe

parent d9d149a396

commit 5ed61d3f08

1 changed files with 9 additions and 0 deletions

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block/blk-core.c

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