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-rw-r--r--drivers/idle/intel_idle.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 8e1939f564f4..057ffef37b42 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -584,7 +584,7 @@ static int __init intel_idle_cpuidle_driver_init(void)
drv->state_count = 1;
for (cstate = 0; cstate < CPUIDLE_STATE_MAX; ++cstate) {
- int num_substates, mwait_hint, mwait_cstate, mwait_substate;
+ int num_substates, mwait_hint, mwait_cstate;
if (cpuidle_state_table[cstate].enter == NULL)
break;
@@ -597,14 +597,13 @@ static int __init intel_idle_cpuidle_driver_init(void)
mwait_hint = flg2MWAIT(cpuidle_state_table[cstate].flags);
mwait_cstate = MWAIT_HINT2CSTATE(mwait_hint);
- mwait_substate = MWAIT_HINT2SUBSTATE(mwait_hint);
- /* does the state exist in CPUID.MWAIT? */
+ /* number of sub-states for this state in CPUID.MWAIT */
num_substates = (mwait_substates >> ((mwait_cstate + 1) * 4))
& MWAIT_SUBSTATE_MASK;
- /* if sub-state in table is not enumerated by CPUID */
- if ((mwait_substate + 1) > num_substates)
+ /* if NO sub-states for this state in CPUID, skip it */
+ if (num_substates == 0)
continue;
if (((mwait_cstate + 1) > 2) &&