1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/misc/phantom.c b/drivers/misc/phantom.c
index 75ee0d3f6f45..3712e5077e25 100644
--- a/drivers/misc/phantom.c
+++ b/drivers/misc/phantom.c
@@ -24,7 +24,7 @@
 #include <linux/slab.h>
 #include <linux/phantom.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include <asm/atomic.h>
 #include <asm/io.h>
@@ -38,6 +38,7 @@
 #define PHB_RUNNING             1
 #define PHB_NOT_OH              2
 
+static DEFINE_MUTEX(phantom_mutex);
 static struct class *phantom_class;
 static int phantom_major;
 
@@ -215,17 +216,17 @@ static int phantom_open(struct inode *inode, struct file *file)
         struct phantom_device *dev = container_of(inode->i_cdev,
                         struct phantom_device, cdev);
 
-        lock_kernel();
+        mutex_lock(&phantom_mutex);
         nonseekable_open(inode, file);
 
         if (mutex_lock_interruptible(&dev->open_lock)) {
-                unlock_kernel();
+                mutex_unlock(&phantom_mutex);
                 return -ERESTARTSYS;
         }
 
         if (dev->opened) {
                 mutex_unlock(&dev->open_lock);
-                unlock_kernel();
+                mutex_unlock(&phantom_mutex);
                 return -EINVAL;
         }
 
@@ -236,7 +237,7 @@ static int phantom_open(struct inode *inode, struct file *file)
         atomic_set(&dev->counter, 0);
         dev->opened++;
         mutex_unlock(&dev->open_lock);
-        unlock_kernel();
+        mutex_unlock(&phantom_mutex);
         return 0;
 }