From a802ea96454570f3c526dd9d7ad8c706e570444d Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 4 May 2015 22:53:28 +0200 Subject: [PATCH] cpuidle: Check the sign of index in cpuidle_reflect() Avoid calling the governor's ->reflect method if the state index passed to cpuidle_reflect() is negative. This allows the analogous check to be dropped from menu_reflect(), so do that too, and ensures that arbitrary error codes can be passed to cpuidle_reflect() as the index with no adverse consequences. Signed-off-by: Rafael J. Wysocki Reviewed-by: Daniel Lezcano Acked-by: Peter Zijlstra (Intel) --- drivers/cpuidle/cpuidle.c | 2 +- drivers/cpuidle/governors/menu.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 61c417b9e53f..3b80b77a585d 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -249,7 +249,7 @@ int cpuidle_enter(struct cpuidle_driver *drv, struct cpuidle_device *dev, */ void cpuidle_reflect(struct cpuidle_device *dev, int index) { - if (cpuidle_curr_governor->reflect) + if (cpuidle_curr_governor->reflect && index >= 0) cpuidle_curr_governor->reflect(dev, index); } diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index b8a5fa15ca24..22e4463d1787 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -367,9 +367,9 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) static void menu_reflect(struct cpuidle_device *dev, int index) { struct menu_device *data = this_cpu_ptr(&menu_devices); + data->last_state_idx = index; - if (index >= 0) - data->needs_update = 1; + data->needs_update = 1; } /**