From: Chris Mason <chris.mason@oracle.com>
Date: Tue, 8 Feb 2011 00:21:48 +0000 (-0500)
Subject: md_make_request: don't touch the bio after calling make_request
X-Git-Tag: v2.6.37.1~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c4a0895efdcbc8eb1799c6f749f1b6ae16159fdc;p=pandora-kernel.git

md_make_request: don't touch the bio after calling make_request

commit e91ece5590b3c728624ab57043fc7a05069c604a upstream.

md_make_request was calling bio_sectors() for part_stat_add
after it was calling the make_request function.  This is
bad because the make_request function can free the bio and
because the bi_size field can change around.

The fix here was suggested by Jens Axboe.  It saves the
sector count before the make_request call.  I hit this
with CONFIG_DEBUG_PAGEALLOC turned on while trying to break
his pretty fusionio card.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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