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authorMike Snitzer2015-05-28 15:12:52 -0400
committerMike Snitzer2015-05-29 11:07:36 -0400
commite5d8de32cc02a259e1a237ab57cba00f2930fa6a (patch)
tree5c0230f71e12c9349e9c755f722bf837456b0802
parent45714fbed4556149d7f1730f5bae74f81d5e2cd5 (diff)
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>
-rw-r--r--drivers/md/dm.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1badfb250a18..e24069aaeb18 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1082,13 +1082,11 @@ static void rq_completed(struct mapped_device *md, int rw, bool run_queue)
dm_put(md);
}
-static void free_rq_clone(struct request *clone, bool must_be_mapped)
+static void free_rq_clone(struct request *clone)
{
struct dm_rq_target_io *tio = clone->end_io_data;
struct mapped_device *md = tio->md;
- WARN_ON_ONCE(must_be_mapped && !clone->q);
-
blk_rq_unprep_clone(clone);
if (md->type == DM_TYPE_MQ_REQUEST_BASED)
@@ -1132,7 +1130,7 @@ static void dm_end_request(struct request *clone, int error)
rq->sense_len = clone->sense_len;
}
- free_rq_clone(clone, true);
+ free_rq_clone(clone);
if (!rq->q->mq_ops)
blk_end_request_all(rq, error);
else
@@ -1151,7 +1149,7 @@ static void dm_unprep_request(struct request *rq)
}
if (clone)
- free_rq_clone(clone, false);
+ free_rq_clone(clone);
}
/*