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>

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 4fcbd670415c6fa1a61b02a970563a5d220a9ea7..d9f71581b79b2ede3d90398a6265f6378fa748ac 100644 (file)
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -120,6 +120,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
        unsigned int cpu = (unsigned long)hcpu;
        struct acpi_processor *pr = per_cpu(processors, cpu);
        struct acpi_device *device;
+       action &= ~CPU_TASKS_FROZEN;
 
        /*
         * CPU_STARTING and CPU_DYING must not sleep. Return here since