1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/isdn/mISDN/timerdev.c b/drivers/isdn/mISDN/timerdev.c
index 81048b8ed8ad..de43c8c70ad0 100644
--- a/drivers/isdn/mISDN/timerdev.c
+++ b/drivers/isdn/mISDN/timerdev.c
@@ -24,9 +24,10 @@
 #include <linux/miscdevice.h>
 #include <linux/module.h>
 #include <linux/mISDNif.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include "core.h"
 
+static DEFINE_MUTEX(mISDN_mutex);
 static u_int    *debug;
 
 
@@ -224,7 +225,7 @@ mISDN_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
         if (*debug & DEBUG_TIMER)
                 printk(KERN_DEBUG "%s(%p, %x, %lx)\n", __func__,
                     filep, cmd, arg);
-        lock_kernel();
+        mutex_lock(&mISDN_mutex);
         switch (cmd) {
         case IMADDTIMER:
                 if (get_user(tout, (int __user *)arg)) {
@@ -256,7 +257,7 @@ mISDN_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
         default:
                 ret = -EINVAL;
         }
-        unlock_kernel();
+        mutex_unlock(&mISDN_mutex);
         return ret;
 }