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27 March 2024, 02:37:15 UTC
Revision e5d8de32cc02a259e1a237ab57cba00f2930fa6a authored by Mike Snitzer on 28 May 2015, 19:12:52 UTC, committed by Mike Snitzer on 29 May 2015, 15:07:36 UTC 
dm: fix false warning in free_rq_clone() for unmapped requests
 
When stacking request-based dm device on non blk-mq device and
device-mapper target could not map the request (error target is used,
multipath target with all paths down, etc), the WARN_ON_ONCE() in
free_rq_clone() will trigger when it shouldn't.

The warning was added by commit aa6df8d ("dm: fix free_rq_clone() NULL
pointer when requeueing unmapped request").  But free_rq_clone() with
clone->q == NULL is valid usage for the case where
dm_kill_unmapped_request() initiates request cleanup.

Fix this false warning by just removing the WARN_ON -- it only generated
false positives and was never useful in catching the intended case
(completing clone request not being mapped e.g. clone->q being NULL).

Fixes: aa6df8d ("dm: fix free_rq_clone() NULL pointer when requeueing unmapped request")
Reported-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reported-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 parent 45714fb
History
Tip revision: e5d8de32cc02a259e1a237ab57cba00f2930fa6a authored by Mike Snitzer on 28 May 2015, 19:12:52 UTC
dm: fix false warning in free_rq_clone() for unmapped requests
Tip revision: e5d8de3
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