1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c
index 59de638225fe..e35058bcd7b9 100644
--- a/drivers/isdn/gigaset/interface.c
+++ b/drivers/isdn/gigaset/interface.c
@@ -156,8 +156,10 @@ static int if_open(struct tty_struct *tty, struct file *filp)
         if (!cs || !try_module_get(cs->driver->owner))
                 return -ENODEV;
 
-        if (mutex_lock_interruptible(&cs->mutex))
+        if (mutex_lock_interruptible(&cs->mutex)) {
+                module_put(cs->driver->owner);
                 return -ERESTARTSYS;
+        }
         tty->driver_data = cs;
 
         ++cs->open_count;