linux-kernel - [PATCH]ACPI: Fix CMOS time error after waking up by /proc/acpi/alarm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <42DFA526FC41B1429CE7279EF83C6BDC0148CB4C@pdsmsx415.ccr.corp.intel.com>
Date:	Thu, 19 Jun 2008 21:52:02 +0800
From:	"Chen, Huacai" <huacai.chen@...el.com>
To:	<linux-acpi@...r.kernel.org>,
	<linux-pm@...ts.linux-foundation.org>, <lenb@...nel.org>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH]ACPI: Fix CMOS time error after waking up by /proc/acpi/alarm

From: Huacai Chen <huacai.chen@...el.com>

When writing /proc/acpi/alarm to wakeup up in adjust mode, this patch
read the "century" filed and add it to the "year" field before writing.
This avoids the CMOS time error (2000 years decrement) after waking up.

Signed-off-by: Huacai Chen <huacai.chen@...el.com>
---
diff --git a/drivers/acpi/sleep/proc.c b/drivers/acpi/sleep/proc.c
index 224c57c..2a85783 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);
---
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/