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Date: Tue, 24 Mar 2009 17:26:35 -0700 From: Greg Kroah-Hartman <gregkh@...e.de> To: linux-kernel@...r.kernel.org Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, "Eric W. Biederman" <ebiederm@...stanetworks.com>, Greg Kroah-Hartman <gregkh@...e.de> Subject: [PATCH 31/61] sysfs: Take sysfs_mutex when fetching the root inode. From: Eric W. Biederman <ebiederm@...ssion.com> sysfs_get_inode ultimately calls sysfs_count_nlink when the a directory inode is fectched. sysfs_count_nlink needs to be called under the sysfs_mutex to guard against the unlikely but possible scenario that the root directory is changing as we are counting the number entries in it, and just in general to be consistent. Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com> Acked-by: Tejun Heo <tj@...nel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- fs/sysfs/mount.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c index 8133ca3..84ef378 100644 --- a/fs/sysfs/mount.c +++ b/fs/sysfs/mount.c @@ -52,7 +52,9 @@ static int sysfs_fill_super(struct super_block *sb, void *data, int silent) sysfs_sb = sb; /* get root inode, initialize and unlock it */ + mutex_lock(&sysfs_mutex); inode = sysfs_get_inode(&sysfs_root); + mutex_unlock(&sysfs_mutex); if (!inode) { pr_debug("sysfs: could not get root inode\n"); return -ENOMEM; -- 1.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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