[PATCH 3.19 018/101] Fix bug in blk_rq_merge_ok

[Greg Kroah-Hartman]

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Wenbo Wang <wenbo.wang@xxxxxxxxxxxx>

commit 7ee8e4f3983c4ff700958a6099c8fd212ea67b94 upstream.

Use the right array index to reference the last
element of rq->biotail->bi_io_vec[]

Signed-off-by: Wenbo Wang <wenbo.wang@xxxxxxxxxxxx>
Reviewed-by: Chong Yuan <chong.yuan@xxxxxxxxxxxx>
Fixes: 66cb45aa41315 ("block: add support for limiting gaps in SG lists")
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 block/blk-merge.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -609,7 +609,7 @@ bool blk_rq_merge_ok(struct request *rq,
 	if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS)) {
 		struct bio_vec *bprev;
 
-		bprev = &rq->biotail->bi_io_vec[bio->bi_vcnt - 1];
+		bprev = &rq->biotail->bi_io_vec[rq->biotail->bi_vcnt - 1];
 		if (bvec_gap_to_prev(bprev, bio->bi_io_vec[0].bv_offset))
 			return false;
 	}


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