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[PATCH] hpet-RTC: disable interrupt when no longer needed 

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 <clemens@ladisch.de>
Acked-by: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Clemens Ladisch 2005-10-30 15:03:35 -08:00 committed by Linus Torvalds
parent 0d29086177
commit f00c96f313
2 changed files with 10 additions and 2 deletions
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6
arch/i386/kernel/time_hpet.c
View File

@ -319,8 +319,12 @@ static void hpet_rtc_timer_reinit(void)
{ {
unsigned int cfg, cnt; 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; return;
}
if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ)) if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
hpet_rtc_int_freq = PIE_freq; hpet_rtc_int_freq = PIE_freq;

6
arch/x86_64/kernel/time.c
View File

@ -1138,8 +1138,12 @@ static void hpet_rtc_timer_reinit(void)
{ {
unsigned int cfg, cnt; 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; return;
}
if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ)) if (PIE_on && (PIE_freq > DEFAULT_RTC_INT_FREQ))
hpet_rtc_int_freq = PIE_freq; hpet_rtc_int_freq = PIE_freq;