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Date: Fri, 8 May 2020 14:35:59 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Aaron Ma <aaron.ma@...onical.com>, Alex Deucher <alexander.deucher@....com> Subject: [PATCH 5.6 42/49] drm/amdgpu: Fix oops when pp_funcs is unset in ACPI event From: Aaron Ma <aaron.ma@...onical.com> commit 5932d260a8d85a103bd6c504fbb85ff58b156bf9 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@...onical.com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Cc: stable@...r.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c @@ -91,7 +91,8 @@ void amdgpu_pm_acpi_event_handler(struct 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); }
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