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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>
This commit is contained in:
Jiri Slaby 2007-07-15 23:40:19 -07:00 committed by Linus Torvalds
parent 6804396f1b
commit e0955e14f7
1 changed files with 5 additions and 17 deletions
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22
drivers/char/genrtc.c
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@ -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;
}