1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/char/apm-emulation.c b/drivers/char/apm-emulation.c
index 033e1505fca9..6a420baea268 100644
--- a/drivers/char/apm-emulation.c
+++ b/drivers/char/apm-emulation.c
@@ -13,7 +13,7 @@
 #include <linux/module.h>
 #include <linux/poll.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/miscdevice.h>
@@ -126,6 +126,7 @@ struct apm_user {
 /*
  * Local variables
  */
+static DEFINE_MUTEX(apm_mutex);
 static atomic_t suspend_acks_pending = ATOMIC_INIT(0);
 static atomic_t userspace_notification_inhibit = ATOMIC_INIT(0);
 static int apm_disabled;
@@ -274,7 +275,7 @@ apm_ioctl(struct file *filp, u_int cmd, u_long arg)
         if (!as->suser || !as->writer)
                 return -EPERM;
 
-        lock_kernel();
+        mutex_lock(&apm_mutex);
         switch (cmd) {
         case APM_IOC_SUSPEND:
                 mutex_lock(&state_lock);
@@ -335,7 +336,7 @@ apm_ioctl(struct file *filp, u_int cmd, u_long arg)
                 mutex_unlock(&state_lock);
                 break;
         }
-        unlock_kernel();
+        mutex_unlock(&apm_mutex);
 
         return err;
 }
@@ -370,7 +371,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 {
         struct apm_user *as;
 
-        lock_kernel();
+        mutex_lock(&apm_mutex);
         as = kzalloc(sizeof(*as), GFP_KERNEL);
         if (as) {
                 /*
@@ -390,7 +391,7 @@ static int apm_open(struct inode * inode, struct file * filp)
 
                 filp->private_data = as;
         }
-        unlock_kernel();
+        mutex_unlock(&apm_mutex);
 
         return as ? 0 : -ENOMEM;
 }