[patch 1/2] sysfs: allow removal of nonexistent sysfs groups.

[Heiko Carstens <heiko.carstens@de.ibm.com>]

From: Heiko Carstens <heiko.carstens@de.ibm.com>

This patch makes it safe to call sysfs_remove_group() with a name group
that doesn't exist. Needed to make fix cpu hotplug stuff in topology code.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
 fs/sysfs/group.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6/fs/sysfs/group.c
===================================================================
--- linux-2.6.orig/fs/sysfs/group.c	2006-10-09 09:15:25.000000000 +0200
+++ linux-2.6/fs/sysfs/group.c	2006-10-09 09:25:23.000000000 +0200
@@ -68,9 +68,12 @@
 {
 	struct dentry * dir;
 
-	if (grp->name)
+	if (grp->name) {
+		if (!sysfs_dirent_exist(kobj->dentry->d_fsdata, grp->name))
+			return;
 		dir = lookup_one_len(grp->name, kobj->dentry,
 				strlen(grp->name));
+	}
 	else
 		dir = dget(kobj->dentry);