From 31a3409065d1d5bf0f12ad76b8c7f471134bf596 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Fri, 27 Feb 2015 00:39:56 +0100 Subject: cpuidle / sleep: Do sanity checks in cpuidle_enter_freeze() too Modify cpuidle_enter_freeze() to do the sanity checks done by cpuidle_select() to avoid crashing the suspend-to-idle code path in case something is missing. Fixes: 381063133246 (PM / sleep: Re-implement suspend-to-idle handling) Original-by: Lorenzo Pieralisi Signed-off-by: Rafael J. Wysocki Acked-by: Peter Zijlstra (Intel) --- drivers/cpuidle/cpuidle.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) (limited to 'drivers/cpuidle/cpuidle.c') diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index b573f584b15a..8b3e132b6a01 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -44,6 +44,12 @@ void disable_cpuidle(void) off = 1; } +static bool cpuidle_not_available(struct cpuidle_driver *drv, + struct cpuidle_device *dev) +{ + return off || !initialized || !drv || !dev || !dev->enabled; +} + /** * cpuidle_play_dead - cpu off-lining * @@ -126,6 +132,9 @@ void cpuidle_enter_freeze(void) struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev); int index; + if (cpuidle_not_available(drv, dev)) + goto fallback; + /* * Find the deepest state with ->enter_freeze present, which guarantees * that interrupts won't be enabled when it exits and allows the tick to @@ -143,10 +152,13 @@ void cpuidle_enter_freeze(void) * at all and try to enter it normally. */ index = cpuidle_find_deepest_state(drv, dev, false); - if (index >= 0) + if (index >= 0) { cpuidle_enter(drv, dev, index); - else - arch_cpu_idle(); + return; + } + + fallback: + arch_cpu_idle(); } /** @@ -205,12 +217,9 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv, */ int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) { - if (off || !initialized) + if (cpuidle_not_available(drv, dev)) return -ENODEV; - if (!drv || !dev || !dev->enabled) - return -EBUSY; - return cpuidle_curr_governor->select(drv, dev); } -- cgit