Commit ea9c167d authored Jul 31, 2014 by Lan Tianyu Committed by Rafael J. Wysocki Aug 06, 2014

ACPI / processor: Make acpi_cpu_soft_notify() process CPU FROZEN events

CPU hotplug happens during S2RAM and CPU notify event will be CPU_XXX_FROZEN.
acpi_cpu_soft_notify() ignores to check these events. This also may make
acpi_cpu_soft_notify() fall into sleep during CPU_DYING/STARTING_FROZEN
events which don't allow callbacks to sleep. This patch is to fix it.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 515afdcb

drivers/acpi/processor_driver.c

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -120,6 +120,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
	unsigned int cpu = (unsigned long)hcpu;		unsigned int cpu = (unsigned long)hcpu;
	struct acpi_processor *pr = per_cpu(processors, cpu);		struct acpi_processor *pr = per_cpu(processors, cpu);
	struct acpi_device *device;		struct acpi_device *device;
			action &= ~CPU_TASKS_FROZEN;

	/*		/*
	* CPU_STARTING and CPU_DYING must not sleep. Return here since		* CPU_STARTING and CPU_DYING must not sleep. Return here since