From: Stefan Behrens <sbehrens@giantdisaster.de>
Date: Mon, 19 Mar 2012 15:17:22 +0000 (+0100)
Subject: Btrfs: fix btrfs_ioctl_dev_info() crash on missing device
X-Git-Tag: v3.4-rc5~6^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99ba55ad696944b37d5557bc5b4816890854fdb9;p=pandora-kernel.git

Btrfs: fix btrfs_ioctl_dev_info() crash on missing device

When a filesystem is mounted with the degraded option, it is
possible that some of the devices are not there.
btrfs_ioctl_dev_info() crashs in this case because the device
name is a NULL pointer. This ioctl was only used for scrub.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
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