When the emulated RTC interrupt is no longer needed, we better disable
it; otherwise, we get a spurious interrupt whenever the timer has
rolled over and reaches the same comparator value.
Having a superfluous interrupt every five minutes doesn't hurt much,
but it's bad style anyway. ;-)
Signed-off-by: Clemens Ladisch <[email protected]>
Index: linux-2.6.13/arch/i386/kernel/time_hpet.c
===================================================================
--- linux-2.6.13.orig/arch/i386/kernel/time_hpet.c 2005-09-27 21:54:12.000000000 +0200
+++ linux-2.6.13/arch/i386/kernel/time_hpet.c 2005-09-27 21:56:38.000000000 +0200
@@ -319,8 +319,12 @@ static void hpet_rtc_timer_reinit(void)
{
unsigned int cfg, cnt;
- if (!(PIE_on | AIE_on | UIE_on))
+ if (unlikely(!(PIE_on | AIE_on | UIE_on))) {
+ cfg = hpet_readl(HPET_T1_CFG);
+ cfg &= ~HPET_TN_ENABLE;
+ hpet_writel(cfg, HPET_T1_CFG);
return;
+ }
if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
hpet_rtc_int_freq = PIE_freq;
Index: linux-2.6.13/arch/x86_64/kernel/time.c
===================================================================
--- linux-2.6.13.orig/arch/x86_64/kernel/time.c 2005-09-27 21:54:12.000000000 +0200
+++ linux-2.6.13/arch/x86_64/kernel/time.c 2005-09-27 21:57:27.000000000 +0200
@@ -1149,8 +1149,12 @@ static void hpet_rtc_timer_reinit(void)
{
unsigned int cfg, cnt;
- if (!(PIE_on | AIE_on | UIE_on))
+ if (unlikely(!(PIE_on | AIE_on | UIE_on))) {
+ cfg = hpet_readl(HPET_T1_CFG);
+ cfg &= ~HPET_TN_ENABLE;
+ hpet_writel(cfg, HPET_T1_CFG);
return;
+ }
if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
hpet_rtc_int_freq = PIE_freq;
-
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