1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 814583bd2fe7..025c60a17a4a 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -26,10 +26,7 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                                         struct rtc_device, char_dev);
         const struct rtc_class_ops *ops = rtc->ops;
 
-        /* We keep the lock as long as the device is in use
-         * and return immediately if busy
-         */
-        if (!(mutex_trylock(&rtc->char_lock)))
+        if (test_and_set_bit_lock(RTC_DEV_BUSY, &rtc->flags))
                 return -EBUSY;
 
         file->private_data = rtc;
@@ -43,8 +40,8 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
                 return 0;
         }
 
-        /* something has gone wrong, release the lock */
-        mutex_unlock(&rtc->char_lock);
+        /* something has gone wrong */
+        clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
         return err;
 }
 
@@ -405,7 +402,7 @@ static int rtc_dev_release(struct inode *inode, struct file *file)
         if (rtc->ops->release)
                 rtc->ops->release(rtc->dev.parent);
 
-        mutex_unlock(&rtc->char_lock);
+        clear_bit_unlock(RTC_DEV_BUSY, &rtc->flags);
         return 0;
 }
 
@@ -440,7 +437,6 @@ void rtc_dev_prepare(struct rtc_device *rtc)
 
         rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
 
-        mutex_init(&rtc->char_lock);
 #ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
         INIT_WORK(&rtc->uie_task, rtc_uie_task);
         setup_timer(&rtc->uie_timer, rtc_uie_timer, (unsigned long)rtc);