Messages in this thread Patch in this message | | | From | Lan Tianyu <> | Subject | [PATCH] ACPI/Processor: Add CPU_STARTING_FROZEN check in the acpi_cpu_soft_notify() | Date | Thu, 31 Jul 2014 17:20:26 +0800 |
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The callback of CPU_STARTING event can't sleep and so acpi_cpu_soft_notify() return directly when CPU_STARTING event is triggered. But cpu hotplug also happens during S2RAM. The action will become CPU_STARTING_FROZEN. This patch is to fix missing check the frozen event.
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> --- drivers/acpi/processor_driver.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 4fcbd67..66e2249 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -125,7 +125,7 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb, * CPU_STARTING and CPU_DYING must not sleep. Return here since * acpi_bus_get_device() may sleep. */ - if (action == CPU_STARTING || action == CPU_DYING) + if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING || action == CPU_DYING) return NOTIFY_DONE; if (!pr || acpi_bus_get_device(pr->handle, &device)) -- 1.8.4.rc0.1.g8f6a3e5.dirty
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