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blk-mq: Directly schedule q->timeout_work when aborting a request

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Request abortion is performed by overriding deadline to now and
scheduling timeout handling immediately.  For the latter part, the
code was using mod_timer(timeout, 0) which can't guarantee that the
timer runs afterwards.  Let's schedule the underlying work item
directly instead.

This fixes the hangs during probing reported by Sitsofe but it isn't
yet clear to me how the failure can happen reliably if it's just the
above described race condition.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Sitsofe Wheeler <sitsofe@gmail.com>
Reported-by: Meelis Roos <mroos@linux.ee>
Fixes: 358f70da49d7 ("blk-mq: make blk_abort_request() trigger timeout path")
Cc: stable@vger.kernel.org # v4.16
Link: http://lkml.kernel.org/r/CALjAwxh-PVYFnYFCJpGOja+m5SzZ8Sa4J7ohxdK=r8NyOF-EMA@mail.gmail.com
Link: http://lkml.kernel.org/r/alpine.LRH.2.21.1802261049140.4893@math.ut.ee
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: azrim <mirzaspc@gmail.com>
This commit is contained in:
Tejun Heo 2018-04-02 15:04:58 -07:00 committed by azrim
parent 9dbda712da
commit aff7775cc5
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1 changed files with 1 additions and 1 deletions
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block/blk-timeout.c
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@ -163,7 +163,7 @@ void blk_abort_request(struct request *req)
* No need for fancy synchronizations.
*/
blk_rq_set_deadline(req, jiffies);
mod_timer(&req->q->timeout, 0);
kblockd_schedule_work(&req->q->timeout_work);
} else {
if (blk_mark_rq_complete(req))
return;