1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index 6ca0bb949ad3..2095153582f1 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -20,6 +20,7 @@
 #include <linux/signal.h>
 #include <linux/mutex.h>
 #include <linux/mm.h>
+#include <linux/smp_lock.h>
 #include <linux/timer.h>
 #include <linux/wait.h>
 #ifdef CONFIG_ISDN_CAPI_MIDDLEWARE
@@ -983,13 +984,17 @@ capi_ioctl(struct inode *inode, struct file *file,
 static int
 capi_open(struct inode *inode, struct file *file)
 {
+        int ret;
+        
+        lock_kernel();
         if (file->private_data)
-                return -EEXIST;
-
-        if ((file->private_data = capidev_alloc()) == NULL)
-                return -ENOMEM;
-
-        return nonseekable_open(inode, file);
+                ret = -EEXIST;
+        else if ((file->private_data = capidev_alloc()) == NULL)
+                ret = -ENOMEM;
+        else
+                ret = nonseekable_open(inode, file);
+        unlock_kernel();
+        return ret;
 }
 
 static int