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authorJiri Slaby <jirislaby@gmail.com>2007-07-15 23:40:19 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 09:05:44 -0700
commite0955e14f72dd1f561dc8b7c4434a253914ddfd4 (patch)
tree0a5cc911207d0bf710dbc4d3896e808e631ff1ec /drivers/char/genrtc.c
parent6804396f1b66c504bac1267d71a857f7a1d1e9dd (diff)
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>
Diffstat (limited to 'drivers/char/genrtc.c')
-rw-r--r--drivers/char/genrtc.c22
1 files changed, 5 insertions, 17 deletions
diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 9e1fc02967ff..69f0a2993af0 100644
--- 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;
}