linux-kernel - Re: [PATCH 4.19 143/639] rtc: cmos: ignore bogus century byte

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Message-ID: <20200125120458.GB14064@duo.ucw.cz>
Date:   Sat, 25 Jan 2020 13:04:59 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Sylvain Chouleur <sylvain.chouleur@...el.com>,
        Patrick McDermott <patrick.mcdermott@...iquity.com>,
        linux-rtc@...r.kernel.org, Eric Wong <e@...24.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 143/639] rtc: cmos: ignore bogus century byte

Hi!

> From: Eric Wong <e@...24.org>
> 
> [ Upstream commit 2a4daadd4d3e507138f8937926e6a4df49c6bfdc ]
> 
> Older versions of Libreboot and Coreboot had an invalid value
> (`3' in my case) in the century byte affecting the GM45 in
> the Thinkpad X200.  Not everybody's updated their firmwares,
> and Linux <= 4.2 was able to read the RTC without problems,
> so workaround this by ignoring invalid values.

Should it print a warning so that wrong BIOSes are eventually fixed?

Best regards,
								Pavel
								
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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