W dniu 06.01.2022 o 09:46, Riwen Lu pisze:
> There's limiting the year to 2069. When setting the rtc year to 2070,
> reading it returns 1970. Evaluate century starting from 19 to count the
> correct year.
>
> $ sudo date -s 20700106
> Mon 06 Jan 2070 12:00:00 AM CST
> $ sudo hwclock -w
> $ sudo hwclock -r
> 1970-01-06 12:00:49.604968+08:00
Indeed, my system is also affected.
> Fixes: 2a4daadd4d3e5071 ("rtc: cmos: ignore bogus century byte")
>
> Signed-off-by: Riwen Lu <luriwen@xxxxxxxxxx>
Reviewed-by: Mateusz Jończyk <mat.jonczyk@xxxxx>
Cc: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
> ---
> drivers/rtc/rtc-mc146818-lib.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/rtc/rtc-mc146818-lib.c b/drivers/rtc/rtc-mc146818-lib.c
> index dcfaf09946ee..2065842f775d 100644
> --- a/drivers/rtc/rtc-mc146818-lib.c
> +++ b/drivers/rtc/rtc-mc146818-lib.c
> @@ -104,7 +104,7 @@ unsigned int mc146818_get_time(struct rtc_time *time)
> time->tm_year += real_year - 72;
> #endif
>
> - if (century > 20)
> + if (century > 19)
> time->tm_year += (century - 19) * 100;
>
> /*
