From: Tejun Heo <tj@kernel.org>
Date: Wed, 1 Jun 2011 06:27:41 +0000 (+0200)
Subject: block: blkdev_get() should access ->bd_disk only after success
X-Git-Tag: v3.0-rc2~8^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4c49ff3fe128ca68dabd07537415c419ad7f82f9;p=pandora-kernel.git

block: blkdev_get() should access ->bd_disk only after success

d4dc210f69 (block: don't block events on excl write for non-optical
devices) added dereferencing of bdev->bd_disk to test
GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; however, bdev->bd_disk can be
%NULL if open failed which can lead to an oops.

Test the flag after testing open was successful, not before.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: David Miller <davem@davemloft.net>
Tested-by: David Miller <davem@davemloft.net>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

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