The patch titled
Subject: drivers/cpuidle/coupled.c: fix sleeping while atomic in cpu
notifier
has been added to the -mm tree. Its filename is
drivers-cpuidle-coupledc-fix-sleeping-while-atomic-in-cpu-notifier.patch
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------------------------------------------------------
From: Colin Cross <[email protected]>
Subject: drivers/cpuidle/coupled.c: 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 <[email protected]>
Acked-by: Santosh Shilimkar <[email protected]>
Cc: Srivatsa S. Bhat <[email protected]>
Cc: Len Brown <[email protected]>
Cc: "Brown, Len" <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
drivers/cpuidle/coupled.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff -puN
drivers/cpuidle/coupled.c~drivers-cpuidle-coupledc-fix-sleeping-while-atomic-in-cpu-notifier
drivers/cpuidle/coupled.c
---
a/drivers/cpuidle/coupled.c~drivers-cpuidle-coupledc-fix-sleeping-while-atomic-in-cpu-notifier
+++ a/drivers/cpuidle/coupled.c
@@ -678,6 +678,18 @@ static int cpuidle_coupled_cpu_notify(st
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);
_
Patches currently in -mm which might be from [email protected] are
linux-next.patch
drivers-cpuidle-coupledc-fix-sleeping-while-atomic-in-cpu-notifier.patch
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