From: Huacai Chen <huacai.chen@xxxxxxxxx>
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: Huacai Chen <huacai.chen@xxxxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxxx>
---
diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 224c57c..c9fdf7b 100644
--- a/drivers/acpi/sleep/proc.c
+++ b/drivers/acpi/sleep/proc.c
@@ -315,8 +315,11 @@ acpi_system_write_alarm(struct file *file,
cmos_bcd_write(day, acpi_gbl_FADT.day_alarm,
rtc_control);
if (acpi_gbl_FADT.month_alarm)
cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm,
rtc_control);
- if (acpi_gbl_FADT.century)
+ if (acpi_gbl_FADT.century) {
+ if (adjust)
+ yr += cmos_bcd_read(acpi_gbl_FADT.century,
rtc_control) * 100;
cmos_bcd_write(yr / 100, acpi_gbl_FADT.century,
rtc_control);
+ }
/* enable the rtc alarm interrupt */
rtc_control |= RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
---
This is for Linux 2.6.26-rc7.
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