ACPI: prevent processor.max_cstate=0 boot crash

As processor.max_cstate is an init-time-only modparam,
sanity checking it at init-time is sufficient.

http://bugzilla.kernel.org/show_bug.cgi?id=13142



Signed-off-by: Len Brown <len.brown@intel.com>

parent 09106974

drivers/acpi/processor_idle.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1037,6 +1037,9 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
		dev->states[i].desc[0] = '\0';
		}

		if (max_cstate == 0)
		max_cstate = 1;

		for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
		cx = &pr->power.states[i];
		state = &dev->states[count];