Fix a race in the initialization of HPET, which might result in a
5 minute lockup on boot.
Signed-off-by: Jiri Bohac <[email protected]>
Index: linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
===================================================================
--- linux-2.6.20-rc5.orig/arch/x86_64/kernel/apic.c
+++ linux-2.6.20-rc5/arch/x86_64/kernel/apic.c
@@ -764,10 +767,12 @@ static void setup_APIC_timer(unsigned in
/* wait for irq slice */
if (vxtime.hpet_address && hpet_use_timer) {
- int trigger = hpet_readl(HPET_T0_CMP);
- while (hpet_readl(HPET_COUNTER) >= trigger)
- /* do nothing */ ;
- while (hpet_readl(HPET_COUNTER) < trigger)
+ int trigger;
+ do
+ trigger = hpet_readl(HPET_T0_CMP);
+ while (hpet_readl(HPET_COUNTER) >= trigger);
+
+ while (hpet_readl(HPET_COUNTER) < trigger)
/* do nothing */ ;
} else {
int c1, c2;
--
-
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