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Commit cce3ce89 authored by Huacai Chen's avatar Huacai Chen Committed by Linus Torvalds
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rtc: fix CMOS time error after writing /proc/acpi/alarm



When writing /proc/acpi/alarm in adjust mode, e.g.
	echo "+0000-00-00 00:00:15" >/proc/acpi/alarm
The "century" field should be read and added to "year" field before
writing, otherwise the CMOS time will go back to 2000 years ago, e.g.
	# cat /proc/acpi/alarm
	0008-06-21 11:38:46
Then the system time may be reset to the date of manufacture after
rebooting. This patch fixed this issue.

Signed-off-by: default avatarHuacai Chen <huacai.chen@intel.com>
Acked-by: default avatarPavel Machek <pavel@suse.cz>
Acked-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Acked-by: default avatarAlessandro Zummo <a.zummo@towertech.it>
Acked-by: default avatarLen Brown <lenb@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 471d47e3
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