[PATCH] x86_64: Only switch to IPI broadcast timer on Intel when C3 is supported
Bug in apic timer removal on C3 patch. We should switch to IPI from APIC timer
only when C3 state is valid.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index be2dae5..3bfca09 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -899,7 +899,7 @@
case ACPI_STATE_C3:
acpi_processor_power_verify_c3(pr, cx);
#ifdef ARCH_APICTIMER_STOPS_ON_C3
- if (c->x86_vendor == X86_VENDOR_INTEL) {
+ if (cx->valid && c->x86_vendor == X86_VENDOR_INTEL) {
on_each_cpu(switch_APIC_timer_to_ipi,
&mask, 1, 1);
}