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Date:   Sun, 6 Feb 2022 14:07:16 +0100
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Mateusz =?utf-8?Q?Jo=C5=84czyk?= <mat.jonczyk@o2.pl>
Cc:     stable@vger.kernel.org, linux-rtc@vger.kernel.org,
        Riwen Lu <luriwen@kylinos.cn>, Eric Wong <e@80x24.org>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>
Subject: Re: [PATCH] rtc: cmos: Evaluate century appropriate
Message-ID: <Yf/IBKDwdb3fIgHR@kroah.com>
References: <20220205221139.5557-1-mat.jonczyk@o2.pl>
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On Sat, Feb 05, 2022 at 11:11:39PM +0100, Mateusz Jończyk wrote:
> From: Riwen Lu <luriwen@kylinos.cn>
> 
> commit ff164ae39b82ee483b24579c8e22a13a8ce5bd04 upstream.
> 
> 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
> 
> Fixes: 2a4daadd4d3e5071 ("rtc: cmos: ignore bogus century byte")
> 
> Signed-off-by: Riwen Lu <luriwen@kylinos.cn>
> Acked-by: Eric Wong <e@80x24.org>
> Reviewed-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> Link: https://lore.kernel.org/r/20220106084609.1223688-1-luriwen@kylinos.cn
> Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl> # preparation for stable
> ---
>  drivers/rtc/rtc-mc146818-lib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Hello,
> 
> I have prepared this patch for inclusion into stable. Run-tested on top
> of 5.16.7 and 4.9.299, works as intended.

Now queued up, thanks.

greg k-h