From 7ee8e4f3983c4ff700958a6099c8fd212ea67b94 Mon Sep 17 00:00:00 2001
From: Wenbo Wang <wenbo.wang@memblaze.com>
Date: Fri, 20 Mar 2015 01:04:54 -0400
Subject: [PATCH] Fix bug in blk_rq_merge_ok

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

Signed-off-by: Wenbo Wang <wenbo.wang@memblaze.com>
Reviewed-by: Chong Yuan <chong.yuan@memblaze.com>
Fixes: 66cb45aa41315 ("block: add support for limiting gaps in SG lists")
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
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