diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-03-07 17:10:11 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-03-08 14:13:48 -0700 |
| commit | 1db2008b79a32db2ad41338c6c74c4735cf74f6d (patch) | |
| tree | c417aaac9968d2d2af514c257773e7087ee0b679 | |
| parent | 8b904b5b6b58b9a29dcf3f82d936d9e7fd69fda6 (diff) | |
block: Complain if queue_flag_(set|clear)_unlocked() is abused
Since it is not safe to use queue_flag_(set|clear)_unlocked()
without holding the queue lock after the sysfs entries for a
queue have been created, complain if this happens.
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | include/linux/blkdev.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f84b3c7887b1..888c9b25cb8f 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -728,12 +728,18 @@ static inline void queue_lockdep_assert_held(struct request_queue *q) static inline void queue_flag_set_unlocked(unsigned int flag, struct request_queue *q) { + if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && + kref_read(&q->kobj.kref)) + lockdep_assert_held(q->queue_lock); __set_bit(flag, &q->queue_flags); } static inline void queue_flag_clear_unlocked(unsigned int flag, struct request_queue *q) { + if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && + kref_read(&q->kobj.kref)) + lockdep_assert_held(q->queue_lock); __clear_bit(flag, &q->queue_flags); } |