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alarmtimer: Check RTC features instead of ops

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RTC drivers used to leave .set_alarm() NULL in order to signal the RTC
device doesn't support alarms. The drivers are now clearing the
RTC_FEATURE_ALARM bit for that purpose in order to keep the rtc_class_ops
structure const. So now, .set_alarm() is set unconditionally and this
possibly causes the alarmtimer code to select an RTC device that doesn't
support alarms.

Test RTC_FEATURE_ALARM instead of relying on ops->set_alarm to determine
whether alarms are available.

Fixes: 7ae41220ef ("rtc: introduce features bitfield")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210511014516.563031-1-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni 2021-05-11 03:45:16 +02:00 committed by Thomas Gleixner
parent 6efb943b86
commit e09784a8a7
1 changed files with 1 additions and 1 deletions
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2
kernel/time/alarmtimer.c
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@ -92,7 +92,7 @@ static int alarmtimer_rtc_add_device(struct device *dev,
if (rtcdev)
return -EBUSY;
if (!rtc->ops->set_alarm)
if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
return -1;
if (!device_may_wakeup(rtc->dev.parent))
return -1;