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blk-merge: warn if figured out segment number is bigger than nr_phys_segments

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We had seen lots of reports of this kind issue, so add one
warnning in blk-merge, then it can be triggered easily and
avoid to depend on warning/bug from drivers.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Ming Lei 2015-11-24 10:35:31 +08:00 committed by Jens Axboe
parent 02e707424c
commit 12e57f59ca
1 changed files with 6 additions and 0 deletions
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6
block/blk-merge.c
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@ -428,6 +428,12 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
if (sg)
sg_mark_end(sg);
/*
* Something must have been wrong if the figured number of
* segment is bigger than number of req's physical segments
*/
WARN_ON(nsegs > rq->nr_phys_segments);
return nsegs;
}
EXPORT_SYMBOL(blk_rq_map_sg);