alarmtimer: Drop device refcount after rtc_open()

class_find_device() takes a refcount on the rtc device. rtc_open()
takes another one, so we can drop it after the rtc_open() call.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c
index e5db9b00751b..c6027fe9a4e6 100644
--- a/kernel/time/alarmtimer.c
+++ b/kernel/time/alarmtimer.c
@@ -675,8 +675,14 @@ static int __init alarmtimer_init_late(void)
         /* Find an rtc device and init the rtc_timer */
         dev = class_find_device(rtc_class, NULL, &str, has_wakealarm);
         /* If we have a device then str is valid. See has_wakealarm() */
-        if (dev)
+        if (dev) {
                 rtcdev = rtc_class_open(str);
+                /*
+                 * Drop the reference we got in class_find_device,
+                 * rtc_open takes its own.
+                 */
+                put_device(dev);
+        }
         if (!rtcdev) {
                 printk(KERN_WARNING "No RTC device found, ALARM timers will"
                         " not wake from suspend");