tree 2ed054abb499ec7f19b63f9f5b24acff932d079f
parent 7afafc8a44bf0ab841b17d450b02aedb3a138985
author Bart Van Assche <bart.vanassche@sandisk.com> 1471391316 -0700
committer Jens Axboe <axboe@fb.com> 1471397774 -0600

block: Fix race triggered by blk_set_queue_dying()

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>