diff --git a/[refs] b/[refs]
index c4d3290aefae..a10eec70651d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: de481ba925e880764e38b8756c93c05006892507
+refs/heads/master: f50bf2b2f5e83b794e0bdb2f3f589f55ef0d52d0
diff --git a/trunk/drivers/video/sm501fb.c b/trunk/drivers/video/sm501fb.c
index 98f24f0ec00d..16d4f4c7d52b 100644
--- a/trunk/drivers/video/sm501fb.c
+++ b/trunk/drivers/video/sm501fb.c
@@ -1624,6 +1624,8 @@ static int __devinit sm501fb_start_one(struct sm501fb_info *info,
 	if (!fbi)
 		return 0;
 
+	mutex_init(&info->fb[head]->mm_lock);
+
 	ret = sm501fb_init_fb(info->fb[head], head, drvname);
 	if (ret) {
 		dev_err(info->dev, "cannot initialise fb %s\n", drvname);