cpuidle/coupled: Remove cpuidle_device::safe_state_index

cpuidle_device::safe_state_index need to be initialized before
use, it should be the same as cpuidle_driver::safe_state_index.

We tackled this issue by removing the safe_state_index from the
cpuidle_device structure and use the one in the cpuidle_driver
structure instead.
Suggested-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpuidle/coupled.c

@@ -473,7 +473,7 @@ int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
 			return entered_state;
 		}
 		entered_state = cpuidle_enter_state(dev, drv,
-			dev->safe_state_index);
+			drv->safe_state_index);
 		local_irq_disable();
 	}
 
@@ -521,7 +521,7 @@ int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
 		}
 
 		entered_state = cpuidle_enter_state(dev, drv,
-			dev->safe_state_index);
+			drv->safe_state_index);
 		local_irq_disable();
 	}
 

include/linux/cpuidle.h

@@ -84,7 +84,6 @@ struct cpuidle_device {
 	struct list_head 	device_list;
 
 #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
-	int			safe_state_index;
 	cpumask_t		coupled_cpus;
 	struct cpuidle_coupled	*coupled;
 #endif