This is a note to let you know that I've just added the patch titled
rtc: allow rtc_read_alarm without read_alarm callback
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
rtc-allow-rtc_read_alarm-without-read_alarm-callback.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6ba6bcfe0a97e993f580147d688ee0c1722f0306
Author: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Date: Tue Feb 14 23:27:53 2023 +0100
rtc: allow rtc_read_alarm without read_alarm callback
[ Upstream commit a783c962619271a8b905efad1d89adfec11ae0c8 ]
.read_alarm is not necessary to read the current alarm because it is
recorded in the aie_timer and so rtc_read_alarm() will never call
rtc_read_alarm_internal() which is the only function calling the callback.
Reported-by: Zhipeng Wang <zhipeng.wang_1@xxxxxxx>
Reported-by: Marcel Ziswiler <marcel.ziswiler@xxxxxxxxxxx>
Fixes: 7ae41220ef58 ("rtc: introduce features bitfield")
Tested-by: Philippe Schenker <philippe.schenker@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230214222754.582582-1-alexandre.belloni@xxxxxxxxxxx
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 3ee17c4d72987..f49ab45455d7c 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -392,7 +392,7 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
return err;
if (!rtc->ops) {
err = -ENODEV;
- } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
+ } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features)) {
err = -EINVAL;
} else {
memset(alarm, 0, sizeof(struct rtc_wkalrm));
