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ACPI: fix 2.6.20 SMP boot regression

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Always disable/enable interrupts in the acpi idle routine,
even in the error path.

This is required as the 2.6.20 change in git commit d331e739f5ad2aaa9...
"Fix interrupt race in idle callback" expects the idle handler
to enable interrupt before returning.

There was a case in acpi idle routine, in which interrupt was not being
enabled before return, which caused the system to hang at bootup, while
enabling C-states on an SMP system.

The signature of the hang was that "processor.nocst"
was required to enable boot.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi 2007-06-15 19:36:00 -04:00 committed by Len Brown
parent 83dd450445
commit d5a3d32a04
1 changed files with 6 additions and 4 deletions
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10
drivers/acpi/processor_idle.c
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@ -332,16 +332,18 @@ static void acpi_processor_idle(void)
int sleep_ticks = 0;
u32 t1, t2 = 0;
pr = processors[smp_processor_id()];
if (!pr)
return;
/*
* Interrupts must be disabled during bus mastering calculations and
* for C2/C3 transitions.
*/
local_irq_disable();
pr = processors[smp_processor_id()];
if (!pr) {
local_irq_enable();
return;
}
/*
* Check whether we truly need to go idle, or should
* reschedule: