ACPI: Reevaluate whether the T-state is supported or not after cpu is online/offline

After one CPU is offlined, it is unnecessary to switch T-state for it.
So it will be better that the throttling is disabled after the cpu
is offline.
At the same time after one cpu is online, we should check whether
the T-state is supported and then set the corresponding T-state
flag.

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index 85e48047d7b0..c8a0ca2af839 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -478,8 +478,13 @@ static int acpi_cpu_soft_notify(struct notifier_block *nfb,
         if (action == CPU_ONLINE && pr) {
                 acpi_processor_ppc_has_changed(pr, 0);
                 acpi_processor_cst_has_changed(pr);
+                acpi_processor_reevaluate_tstate(pr, action);
                 acpi_processor_tstate_has_changed(pr);
         }
+        if (action == CPU_DEAD && pr) {
+                /* invalidate the flag.throttling after one CPU is offline */
+                acpi_processor_reevaluate_tstate(pr, action);
+        }
         return NOTIFY_OK;
 }