Commit 578270bf authored Nov 24, 2015 by Ming Lei Committed by Jens Axboe Nov 23, 2015

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: 5014c311(block: fix bogus compiler warnings in blk-merge.c)
Cc: stable@kernel.org #4.3
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: Mark Salter <msalter@redhat.com>
Tested-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Tested-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent b094f89c

block/blk-merge.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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 @@ static struct bio blk_bio_segment_split(struct request_queue q,

		nsegs++;
		bvprv = bv;
		bvprvp = &bv;
		bvprvp = &bvprv;
		seg_size = bv.bv_len;
		sectors += bv.bv_len >> 9;
		}