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

commit 5932d260a8 upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Aaron Ma 2020-04-03 22:34:19 +08:00 committed by Greg Kroah-Hartman
parent 3fb4c93dc7
commit b8bb9c3192
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@ -90,7 +90,8 @@ 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);
}