1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index 566343b3c131..b7d96e6236a1 100644
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -25,7 +25,7 @@
 #include <linux/ioport.h>
 #include <linux/timer.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
@@ -89,6 +89,7 @@ struct cpwd {
         } devs[WD_NUMDEVS];
 };
 
+static DEFINE_MUTEX(cpwd_mutex);
 static struct cpwd *cpwd_device;
 
 /* Sun uses Altera PLD EPF8820ATC144-4
@@ -368,7 +369,7 @@ static int cpwd_open(struct inode *inode, struct file *f)
 {
         struct cpwd *p = cpwd_device;
 
-        lock_kernel();
+        mutex_lock(&cpwd_mutex);
         switch (iminor(inode)) {
         case WD0_MINOR:
         case WD1_MINOR:
@@ -376,7 +377,7 @@ static int cpwd_open(struct inode *inode, struct file *f)
                 break;
 
         default:
-                unlock_kernel();
+                mutex_unlock(&cpwd_mutex);
                 return -ENODEV;
         }
 
@@ -386,13 +387,13 @@ static int cpwd_open(struct inode *inode, struct file *f)
                                 IRQF_SHARED, DRIVER_NAME, p)) {
                         printk(KERN_ERR PFX "Cannot register IRQ %d\n",
                                 p->irq);
-                        unlock_kernel();
+                        mutex_unlock(&cpwd_mutex);
                         return -EBUSY;
                 }
                 p->initialized = true;
         }
 
-        unlock_kernel();
+        mutex_unlock(&cpwd_mutex);
 
         return nonseekable_open(inode, f);
 }
@@ -482,9 +483,9 @@ static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
         case WIOCSTART:
         case WIOCSTOP:
         case WIOCGSTAT:
-                lock_kernel();
+                mutex_lock(&cpwd_mutex);
                 rval = cpwd_ioctl(file, cmd, arg);
-                unlock_kernel();
+                mutex_unlock(&cpwd_mutex);
                 break;
 
         /* everything else is handled by the generic compat layer */