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authorHuacai Chen <huacai.chen@intel.com>2008-07-04 12:59:31 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-04 13:40:05 -0400
commitcce3ce89c1abde1298dd0e769ab9c14ea95d7384 (patch)
treefc1ab92f843d28ba4aff86e5c6e0ea225868478f /drivers/acpi/sleep
parent471d47e3223311d2638755717f97dc9a298f6dc9 (diff)
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: Huacai Chen <huacai.chen@intel.com> Acked-by: Pavel Machek <pavel@suse.cz> Acked-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Len Brown <lenb@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/acpi/sleep')
-rw-r--r--drivers/acpi/sleep/proc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 224c57c03381..4ebbba2b6b19 100644
--- a/drivers/acpi/sleep/proc.c
+++ b/drivers/acpi/sleep/proc.c
@@ -315,8 +315,11 @@ acpi_system_write_alarm(struct file *file,
315 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control); 315 cmos_bcd_write(day, acpi_gbl_FADT.day_alarm, rtc_control);
316 if (acpi_gbl_FADT.month_alarm) 316 if (acpi_gbl_FADT.month_alarm)
317 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control); 317 cmos_bcd_write(mo, acpi_gbl_FADT.month_alarm, rtc_control);
318 if (acpi_gbl_FADT.century) 318 if (acpi_gbl_FADT.century) {
319 if (adjust)
320 yr += cmos_bcd_read(acpi_gbl_FADT.century, rtc_control) * 100;
319 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control); 321 cmos_bcd_write(yr / 100, acpi_gbl_FADT.century, rtc_control);
322 }
320 /* enable the rtc alarm interrupt */ 323 /* enable the rtc alarm interrupt */
321 rtc_control |= RTC_AIE; 324 rtc_control |= RTC_AIE;
322 CMOS_WRITE(rtc_control, RTC_CONTROL); 325 CMOS_WRITE(rtc_control, RTC_CONTROL);