cpuidle / ACPI: fix potential NULL pointer dereference

The dereference should be moved below the NULL test.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 3655ab923812..e8086c725305 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1132,7 +1132,7 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
 int acpi_processor_hotplug(struct acpi_processor *pr)
 {
         int ret = 0;
-        struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);
+        struct cpuidle_device *dev;
 
         if (disabled_by_idle_boot_param())
                 return 0;
@@ -1147,6 +1147,7 @@ int acpi_processor_hotplug(struct acpi_processor *pr)
         if (!pr->flags.power_setup_done)
                 return -ENODEV;
 
+        dev = per_cpu(acpi_cpuidle_device, pr->id);
         cpuidle_pause_and_lock();
         cpuidle_disable_device(dev);
         acpi_processor_get_power_info(pr);