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cpuidle: Fix panic in CPU off-lining with no idle driver

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Fix a NULL pointer dereference panic in cpuidle_play_dead() during
CPU off-lining when no cpuidle driver is registered.  A cpuidle
driver may be registered at boot-time based on CPU type.  This patch
allows an off-lined CPU to enter HLT-based idle in this condition.

Signed-off-by: Toshi Kani <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Reviewed-by: Srivatsa S. Bhat <[email protected]>
Tested-by: Srivatsa S. Bhat <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Toshi Kani 2012-03-31 21:37:02 -06:00 • committed by Len Brown
commit ee01e66337
1 changed files with 4 additions and 1 deletions
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5
drivers/cpuidle/cpuidle.c
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@ -74,7 +74,7 @@ static cpuidle_enter_t cpuidle_enter_ops;
/**
* cpuidle_play_dead - cpu off-lining
*
* Only returns in case of an error
* Returns in case of an error or no driver
*/
int cpuidle_play_dead(void)
{
@ -83,6 +83,9 @@ int cpuidle_play_dead(void)
int i, dead_state = -1;
int power_usage = -1;
if (!drv)
return -ENODEV;
/* Find lowest-power state that supports long-term idle */
for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
struct cpuidle_state *s = &drv->states[i];