Source: MontaVista Software, Inc.
Type: Defect Fix 
Disposition: Pending
Description:

I was not happy with the locking on this.  Two changes:
1) Turn off irq while setting the clock.
2) Call the timer code only through the timer interface 
   (set a short timer to do it from the ntp call).

Signed-off-by: George Anzinger <george@mvista.com>

 time.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)

Index: linux-2.6.12-rc/arch/i386/kernel/time.c
===================================================================
--- linux-2.6.12-rc.orig/arch/i386/kernel/time.c
+++ linux-2.6.12-rc/arch/i386/kernel/time.c
@@ -176,12 +176,12 @@ static int set_rtc_mmss(unsigned long no
 	int retval;
 
 	/* gets recalled with irq locally disabled */
-	spin_lock(&rtc_lock);
+	spin_lock_irq(&rtc_lock);
 	if (efi_enabled)
 		retval = efi_set_rtc_mmss(nowtime);
 	else
 		retval = mach_set_rtc_mmss(nowtime);
-	spin_unlock(&rtc_lock);
+	spin_unlock_irq(&rtc_lock);
 
 	return retval;
 }
@@ -282,14 +282,14 @@ unsigned long get_cmos_time(void)
 {
 	unsigned long retval;
 
-	spin_lock(&rtc_lock);
+	spin_lock_irq(&rtc_lock);
 
 	if (efi_enabled)
 		retval = efi_get_time();
 	else
 		retval = mach_get_cmos_time();
 
-	spin_unlock(&rtc_lock);
+	spin_unlock_irq(&rtc_lock);
 
 	return retval;
 }
@@ -338,7 +338,7 @@ static void sync_cmos_clock(unsigned lon
 }
 void notify_arch_cmos_timer(void)
 {
-	sync_cmos_clock(0);
+	mod_timer(&sync_cmos_timer, jiffies + 1);
 }
 static long clock_cmos_diff, sleep_start;