diff options
| author | Roel Kluin <roel.kluin@gmail.com> | 2009-03-31 15:25:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 08:59:26 -0700 |
| commit | fa7af8b1bb6dfca7a0c8541683a9bfffbc8dd345 (patch) | |
| tree | e13f984d52f16ab82f5842d1f2267e13b8c06e36 /drivers | |
| parent | c08cf9daf66844c60ebe9f89885d3a3e1893e61f (diff) | |
rtc: test before subtraction on unsigned
new_alarm is unsigned so test before the subtraction.
[akpm@linux-foundation.org: time-wrapping fix]
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/rtc/rtc-ds1374.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c index a5b0fc09f0c..4d32e328f6c 100644 --- a/drivers/rtc/rtc-ds1374.c +++ b/drivers/rtc/rtc-ds1374.c @@ -222,16 +222,16 @@ static int ds1374_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) rtc_tm_to_time(&alarm->time, &new_alarm); rtc_tm_to_time(&now, &itime); - new_alarm -= itime; - /* This can happen due to races, in addition to dates that are * truly in the past. To avoid requiring the caller to check for * races, dates in the past are assumed to be in the recent past * (i.e. not something that we'd rather the caller know about via * an error), and the alarm is set to go off as soon as possible. */ - if (new_alarm <= 0) + if (time_before_eq(new_alarm, itime)) new_alarm = 1; + else + new_alarm -= itime; mutex_lock(&ds1374->mutex); |