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ACPI: prevent processor.max_cstate=0 boot crash

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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>
This commit is contained in:
Len Brown 2009-04-23 23:21:29 -04:00
parent 0910697403
commit 615dfd93e2
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/processor_idle.c
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@ -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];