Commit 12e57f59 authored by Ming Lei's avatar Ming Lei Committed by Jens Axboe

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

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: default avatarMing Lei <>
Signed-off-by: default avatarJens Axboe <>
parent 02e70742
......@@ -428,6 +428,12 @@ int blk_rq_map_sg(struct request_queue *q, struct request *rq,
if (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;
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