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| author | Sudeep Holla <Sudeep.Holla@arm.com> | 2016-01-21 11:19:29 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-01-22 02:35:49 +0100 |
| commit | 6f16886b7c050c934305b1f285c3458ff1b6e4e4 (patch) | |
| tree | 669ac5705eb1de2d5430531c6c74e5c8460125a5 /drivers | |
| parent | 5bb1729cbdfbe974ad6385be94b14afbac97e19f (diff) | |
| download | linux-6f16886b7c050c934305b1f285c3458ff1b6e4e4.tar.bz2 | |
cpuidle: fix fallback mechanism for suspend to idle in absence of enter_freeze
Commit 51164251f5c3 "sched / idle: Drop default_idle_call() fallback
from call_cpuidle()" made find_deepest_state() return non-negative
value and check all the states with index > 0. Also as a result,
find_deepest_state() returns 0 even when enter_freeze callbacks are not
implemented and enter_freeze_proper() is called which ends up crashing
the kernel.
This patch updates the check for index > 0 in cpuidle_enter_freeze and
cpuidle_idle_call(when idle_should_freeze is true) to restore the
suspend-to-idle functionality in absence of enter_freeze callback.
Fixes: 51164251f5c3 "sched / idle: Drop default_idle_call() fallback from call_cpuidle()"
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 046423b0c5ca..f996efc56605 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -153,7 +153,7 @@ int cpuidle_enter_freeze(struct cpuidle_driver *drv, struct cpuidle_device *dev) * be frozen safely. */ index = find_deepest_state(drv, dev, UINT_MAX, 0, true); - if (index >= 0) + if (index > 0) enter_freeze_proper(drv, dev, index); return index; |