rtc: allow rtc_read_alarm without read_alarm callback #14
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[ Upstream commit a783c96 ] .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 <[email protected]> Reported-by: Marcel Ziswiler <[email protected]> Fixes: 7ae4122 ("rtc: introduce features bitfield") Tested-by: Philippe Schenker <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Alexandre Belloni <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
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it is needed to fix RTC wakealarm feature: adb shell "echo +20 > /sys/class/rtc/rtc0/wakealarm" on kernel 5.15
.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.
Port of: 1e276e8