Char: genrtc, use wait_event_interruptible

genrtc, use wait_event_interruptible

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Roman Zippel <zippel@linux-m68k.org>
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>

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 9e1fc02..69f0a29 100644 (file)
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -173,7 +173,6 @@ static void gen_rtc_interrupt(unsigned long arg)
 static ssize_t gen_rtc_read(struct file *file, char __user *buf,
                        size_t count, loff_t *ppos)
 {
-       DECLARE_WAITQUEUE(wait, current);
        unsigned long data;
        ssize_t retval;
 
@@ -183,18 +182,10 @@ static ssize_t gen_rtc_read(struct file *file, char __user *buf,
        if (file->f_flags & O_NONBLOCK && !gen_rtc_irq_data)
                return -EAGAIN;
 
-       add_wait_queue(&gen_rtc_wait, &wait);
-       retval = -ERESTARTSYS;
-
-       while (1) {
-               set_current_state(TASK_INTERRUPTIBLE);
-               data = xchg(&gen_rtc_irq_data, 0);
-               if (data)
-                       break;
-               if (signal_pending(current))
-                       goto out;
-               schedule();
-       }
+       retval = wait_event_interruptible(gen_rtc_wait,
+                       (data = xchg(&gen_rtc_irq_data, 0)));
+       if (retval)
+               goto out;
 
        /* first test allows optimizer to nuke this case for 32-bit machines */
        if (sizeof (int) != sizeof (long) && count == sizeof (unsigned int)) {
@@ -206,10 +197,7 @@ static ssize_t gen_rtc_read(struct file *file, char __user *buf,
                retval = put_user(data, (unsigned long __user *)buf) ?:
                        sizeof(unsigned long);
        }
- out:
-       __set_current_state(TASK_RUNNING);
-       remove_wait_queue(&gen_rtc_wait, &wait);
-
+out:
        return retval;
 }