drm/amdgpu: Fix oops when pp_funcs is unset in ACPI event

On ARCTURUS and RENOIR, powerplay is not supported yet.
When plug in or unplug power jack, ACPI event will issue.
Then kernel NULL pointer BUG will be triggered.
Check for NULL pointers before calling.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index f197f1b..abe94a5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -89,7 +89,8 @@ void amdgpu_pm_acpi_event_handler(struct amdgpu_device *adev)
                        adev->pm.ac_power = true;
                else
                        adev->pm.ac_power = false;
-               if (adev->powerplay.pp_funcs->enable_bapm)
+               if (adev->powerplay.pp_funcs &&
+                   adev->powerplay.pp_funcs->enable_bapm)
                        amdgpu_dpm_enable_bapm(adev, adev->pm.ac_power);
                mutex_unlock(&adev->pm.mutex);