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cpuidle / menu: Return (-1) if there are no suitable states 

If there is a PM QoS latency limit and all of the sufficiently shallow
C-states are disabled, the cpuidle menu governor returns 0 which on
some systems is CPUIDLE_DRIVER_STATE_START and shouldn't be returned
if that C-state has been disabled.

Fix the issue by modifying the menu governor to return (-1) in such
situations.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki 2014-05-01 00:14:04 +02:00
parent 52c324f8a8
commit 3836785a1b
1 changed files with 1 additions and 1 deletions
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2
drivers/cpuidle/governors/menu.c
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@ -296,7 +296,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
data->needs_update = 0; data->needs_update = 0;
} }
data->last_state_idx = 0; data->last_state_idx = CPUIDLE_DRIVER_STATE_START - 1;
/* Special case when user has set very strict latency requirement */ /* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0)) if (unlikely(latency_req == 0))