1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index d60557cae8e..512dca16a42 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -20,7 +20,7 @@
 #include <linux/module.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 #include <linux/string.h>
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 #include <linux/fs.h>
@@ -68,6 +68,7 @@
 
 #define DRV_VERSION "0.05"
 
+static DEFINE_MUTEX(m41t80_rtc_mutex);
 static const struct i2c_device_id m41t80_id[] = {
         { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
         { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD },
@@ -677,9 +678,9 @@ static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&m41t80_rtc_mutex);
         ret = wdt_ioctl(file, cmd, arg);
-        unlock_kernel();
+        mutex_unlock(&m41t80_rtc_mutex);
 
         return ret;
 }
@@ -693,16 +694,16 @@ static long wdt_unlocked_ioctl(struct file *file, unsigned int cmd,
 static int wdt_open(struct inode *inode, struct file *file)
 {
         if (MINOR(inode->i_rdev) == WATCHDOG_MINOR) {
-                lock_kernel();
+                mutex_lock(&m41t80_rtc_mutex);
                 if (test_and_set_bit(0, &wdt_is_open)) {
-                        unlock_kernel();
+                        mutex_unlock(&m41t80_rtc_mutex);
                         return -EBUSY;
                 }
                 /*
                  *      Activate
                  */
                 wdt_is_open = 1;
-                unlock_kernel();
+                mutex_unlock(&m41t80_rtc_mutex);
                 return nonseekable_open(inode, file);
         }
         return -ENODEV;