* [PATCH 4.4 037/183] rtc: cmos: ignore bogus century byte
[not found] <20200128135829.486060649@linuxfoundation.org>
@ 2020-01-28 14:04 ` Greg Kroah-Hartman
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From: Greg Kroah-Hartman @ 2020-01-28 14:04 UTC (permalink / raw)
To: linux-kernel
Cc: Greg Kroah-Hartman, stable, Alexandre Belloni, Alessandro Zummo,
Sylvain Chouleur, Patrick McDermott, linux-rtc, Eric Wong,
Sasha Levin
From: Eric Wong <e@80x24.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.
Fixes: 3c217e51d8a272b9 ("rtc: cmos: century support")
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Sylvain Chouleur <sylvain.chouleur@intel.com>
Cc: Patrick McDermott <patrick.mcdermott@libiquity.com>
Cc: linux-rtc@vger.kernel.org
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/asm-generic/rtc.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/asm-generic/rtc.h b/include/asm-generic/rtc.h
index 4e3b6558331ea..3e457ae2d571d 100644
--- a/include/asm-generic/rtc.h
+++ b/include/asm-generic/rtc.h
@@ -106,7 +106,7 @@ static inline unsigned int __get_rtc_time(struct rtc_time *time)
time->tm_year += real_year - 72;
#endif
- if (century)
+ if (century > 20)
time->tm_year += (century - 19) * 100;
/*
--
2.20.1
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