From: Udo A. Steinberg <[email protected]>
The chip set doc for IHC4 says:
1.In general, software should not attempt any non-posted accesses during
arbiter disable except to the ICH4's power management registers. This
implies that interrupt handlers for any unmasked hardware interrupts and
SMI/NMI should check ARB_DIS status before reading from ICH devices.
So it's not a good idea to access ICH devices after arbiter shut down.
Signed-off-by: Udo A. Steinberg <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
---
drivers/acpi/processor_idle.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
Index: linux-2.6.22-rc4/drivers/acpi/processor_idle.c
===================================================================
--- linux-2.6.22-rc4.orig/drivers/acpi/processor_idle.c 2007-06-06 11:47:21.000000000 +0200
+++ linux-2.6.22-rc4/drivers/acpi/processor_idle.c 2007-06-06 11:48:21.000000000 +0200
@@ -488,6 +488,11 @@ static void acpi_processor_idle(void)
case ACPI_STATE_C3:
+ /* Get start time (ticks) */
+ t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
+ /* Handle timer broadcast before bus arbiter shutdown ! */
+ acpi_state_timer_broadcast(pr, cx, 1);
+
if (pr->flags.bm_check) {
if (atomic_inc_return(&c3_cpu_count) ==
num_online_cpus()) {
@@ -502,10 +507,7 @@ static void acpi_processor_idle(void)
ACPI_FLUSH_CPU_CACHE();
}
- /* Get start time (ticks) */
- t1 = inl(acpi_gbl_FADT.xpm_timer_block.address);
/* Invoke C3 */
- acpi_state_timer_broadcast(pr, cx, 1);
acpi_cstate_enter(cx);
/* Get end time (ticks) */
t2 = inl(acpi_gbl_FADT.xpm_timer_block.address);
-
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