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authorColin Cross <ccross@android.com>2012-08-15 22:10:50 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2012-08-17 19:37:01 +0200
commit63c6ba4352009a5f85b32307c001abeb5baebd28 (patch)
treea3cf120e9c5caf74dd4704bc484f0f3930d433fa /drivers/cpuidle
parent55d7ec4520e86d735d178c15d7df33d507bd43c6 (diff)
downloadop-kernel-dev-63c6ba4352009a5f85b32307c001abeb5baebd28.zip
op-kernel-dev-63c6ba4352009a5f85b32307c001abeb5baebd28.tar.gz
cpuidle: coupled: fix sleeping while atomic in cpu notifier
The cpu hotplug notifier gets called in both atomic and non-atomic contexts, it is not always safe to lock a mutex. Filter out all events except the six necessary ones, which are all sleepable, before taking the mutex. Signed-off-by: Colin Cross <ccross@android.com> Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/coupled.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c
index 2c9bf26..c24dda0 100644
--- a/drivers/cpuidle/coupled.c
+++ b/drivers/cpuidle/coupled.c
@@ -678,6 +678,18 @@ static int cpuidle_coupled_cpu_notify(struct notifier_block *nb,
int cpu = (unsigned long)hcpu;
struct cpuidle_device *dev;
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_UP_PREPARE:
+ case CPU_DOWN_PREPARE:
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ case CPU_UP_CANCELED:
+ case CPU_DOWN_FAILED:
+ break;
+ default:
+ return NOTIFY_OK;
+ }
+
mutex_lock(&cpuidle_lock);
dev = per_cpu(cpuidle_devices, cpu);
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