[PATCH] fs: Initialize mountpoint list head in new_mountpoint()

[Murilo Opsfelder Araujo <mopsfelder@gmail.com>]

The commit 89f7ca1af15bdfe7a6aed343032a84af2a69f736 makes next-20140818
to panic because mountpoint list head was not initialized.  Initializing
it with NULL fixes the problem.

commit 89f7ca1af15bdfe7a6aed343032a84af2a69f736
Author: Eric W. Biederman <ebiederman@twitter.com>
Date:   Sun Sep 22 19:37:01 2013 -0700

    vfs: Keep a list of mounts on a mount point

    To spot any possible problems call BUG if a mountpoint
        is put when it's list of mounts is not empty.

    AV: use hlist instead of list_head

Signed-off-by: Murilo Opsfelder Araujo <mopsfelder@gmail.com>
---
 fs/namespace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 1a2bbef..1a00bac 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -736,6 +736,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry)
 		return ERR_PTR(ret);
 	}
 
+	INIT_HLIST_HEAD(&mp->m_list);
 	mp->m_dentry = dentry;
 	mp->m_count = 1;
 	hlist_add_head(&mp->m_hash, chain);
-- 
2.1.0.rc2.234.ge4c5f60