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| author | Jens Axboe <axboe@fb.com> | 2014-04-24 16:51:47 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-04-24 16:51:47 +0200 |
| commit | 87ee7b112193bd081ba1a171fa5f6f39c429ef56 (patch) | |
| tree | fbf88d2de279209467dee4d6cd9007f5daa8a678 /block/blk.h | |
| parent | Revert "blk-mq: initialize req->q in allocation" (diff) | |
| download | linux-87ee7b112193bd081ba1a171fa5f6f39c429ef56.tar.xz linux-87ee7b112193bd081ba1a171fa5f6f39c429ef56.zip | |
blk-mq: fix race with timeouts and requeue events
If a requeue event races with a timeout, we can get into the
situation where we attempt to complete a request from the
timeout handler when it's not start anymore. This causes a crash.
So have the timeout handler check that REQ_ATOM_STARTED is still
set on the request - if not, we ignore the event. If this happens,
the request has now been marked as complete. As a consequence, we
need to ensure to clear REQ_ATOM_COMPLETE in blk_mq_start_request(),
as to maintain proper request state.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk.h')
| -rw-r--r-- | block/blk.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/block/blk.h b/block/blk.h index 1d880f1f957f..79be2cbce7fd 100644 --- a/block/blk.h +++ b/block/blk.h @@ -37,9 +37,8 @@ bool __blk_end_bidi_request(struct request *rq, int error, void blk_rq_timed_out_timer(unsigned long data); void blk_rq_check_expired(struct request *rq, unsigned long *next_timeout, unsigned int *next_set); -void __blk_add_timer(struct request *req, struct list_head *timeout_list); +void blk_add_timer(struct request *req); void blk_delete_timer(struct request *); -void blk_add_timer(struct request *); bool bio_attempt_front_merge(struct request_queue *q, struct request *req, |