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authorLen Brown <len.brown@intel.com>2009-04-23 23:21:29 -0400
committerLen Brown <len.brown@intel.com>2009-04-23 23:21:29 -0400
commit615dfd93e2346b604232b559e7ea0835d24abe26 (patch)
treeeed079ff4006c40d882e19533370e36fbb74969d /drivers/acpi/processor_idle.c
parent091069740304c979f957ceacec39c461d0192158 (diff)
downloadlinux-615dfd93e2346b604232b559e7ea0835d24abe26.tar.bz2
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>
Diffstat (limited to 'drivers/acpi/processor_idle.c')
-rw-r--r--drivers/acpi/processor_idle.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 6fe121434ffb..436127e0eec3 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -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];