RTC: periodic irq fix

Add kernel/kernel and kernel/user locking for the periodic irq feature of
the rtc class.

PIE ioctls are also supported.

Signed-off-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 10ab3b71ffc..4dfdf019fcc 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -153,6 +153,7 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
         mutex_init(&rtc->ops_lock);
         spin_lock_init(&rtc->irq_lock);
         spin_lock_init(&rtc->irq_task_lock);
+        init_waitqueue_head(&rtc->irq_queue);
 
         strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
         snprintf(rtc->dev.bus_id, BUS_ID_SIZE, "rtc%d", id);