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| author | Colin Cross <ccross@android.com> | 2012-08-15 22:10:50 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2012-08-17 19:37:01 +0200 |
| commit | 63c6ba4352009a5f85b32307c001abeb5baebd28 (patch) | |
| tree | a3cf120e9c5caf74dd4704bc484f0f3930d433fa /drivers/cpuidle/coupled.c | |
| parent | 55d7ec4520e86d735d178c15d7df33d507bd43c6 (diff) | |
| download | linux-63c6ba4352009a5f85b32307c001abeb5baebd28.tar.gz linux-63c6ba4352009a5f85b32307c001abeb5baebd28.tar.bz2 linux-63c6ba4352009a5f85b32307c001abeb5baebd28.zip | |
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/coupled.c')
| -rw-r--r-- | drivers/cpuidle/coupled.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/cpuidle/coupled.c b/drivers/cpuidle/coupled.c index 2c9bf2692232..c24dda03c143 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); |