struct acpi_processor *pr = per_cpu(processors, cpu);
struct acpi_device *device;
+ /*
+ * CPU_STARTING and CPU_DYING must not sleep. Return here since
+ * acpi_bus_get_device() may sleep.
+ */
+ if (action == CPU_STARTING || action == CPU_DYING)
+ return NOTIFY_DONE;
+
if (!pr || acpi_bus_get_device(pr->handle, &device))
return NOTIFY_DONE;