From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 22 Jan 2014 04:32:05 +0000 (-0800)
Subject: bio-integrity: Fix bio_integrity_verify segment start bug
X-Git-Tag: v3.14-rc1~43^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5837c80e870b;p=pandora-kernel.git

bio-integrity: Fix bio_integrity_verify segment start bug

This patch addresses a bug in bio_integrity_verify() code that has
been causing DIF READ verify operations to be silently skipped.

The issue is that bio->bi_idx will have been incremented within
bio_advance() code in the normal blk_update_request() ->
req_bio_endio() completion path, and bio_integrity_verify() is
using bio_for_each_segment() which starts the bio segment walk
at the current bio->bi_idx.

So instead use bio_for_each_segment_all() to always start the bio
segment walk from zero, regardless of the current bio->bi_idx
value after bio_advance() has been called.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Cc: stable@kernel.dk # >= v3.10
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

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