From: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Date: Sat, 13 Jul 2013 13:02:54 +0000 (+0800)
Subject: Btrfs: set qgroup_ulist to be null after calling ulist_free()
X-Git-Tag: v3.12-rc1~40^2~108
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1e7bac1ef754b3112eb78c64a7382d286e454424;p=pandora-kernel.git

Btrfs: set qgroup_ulist to be null after calling ulist_free()

We call ulist_free(qgroup_ulist) in btrfs_free_qgroup_config(),
and btrfs_free_qgroup_config() may be called in two cases:

(1)umount filesystem
(2)disabling quota

However, if we firstly disable quota and then umount filesystem,
a double free happens. Fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

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