linux-kernel - [PATCH 1/3] block: fix segment split

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Message-Id: <1448332531-10704-2-git-send-email-ming.lei@canonical.com>
Date:	Tue, 24 Nov 2015 10:35:29 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Laurent Dufour <ldufour@...ux.vnet.ibm.com>,
	Mark Salter <msalter@...hat.com>,
	Hannes Reinecke <hare@...e.de>,
	Pratyush Anand <panand@...hat.com>,
	Ming Lei <ming.lei@...onical.com>, stable@...nel.org
Subject: [PATCH 1/3] block: fix segment split

Inside blk_bio_segment_split(), previous bvec pointer(bvprvp)
always points to the iterator local variable, which is obviously
wrong, so fix it by pointing to the local variable of 'bvprv'.

Fixes: 5014c311baa2b(block: fix bogus compiler warnings in blk-merge.c)
Cc: stable@...nel.org #4.3
Reported-by: Michael Ellerman <mpe@...erman.id.au>
Reported-by: Mark Salter <msalter@...hat.com>
Tested-by: Laurent Dufour <ldufour@...ux.vnet.ibm.com>
Tested-by: Mark Salter <msalter@...hat.com>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 block/blk-merge.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/blk-merge.c b/block/blk-merge.c
index de5716d8..f2efe8a 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -98,7 +98,7 @@ static struct bio *blk_bio_segment_split(struct request_queue *q,
 
 			seg_size += bv.bv_len;
 			bvprv = bv;
-			bvprvp = &bv;
+			bvprvp = &bvprv;
 			sectors += bv.bv_len >> 9;
 			continue;
 		}
@@ -108,7 +108,7 @@ new_segment:
 
 		nsegs++;
 		bvprv = bv;
-		bvprvp = &bv;
+		bvprvp = &bvprv;
 		seg_size = bv.bv_len;
 		sectors += bv.bv_len >> 9;
 	}
-- 
1.9.1

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