From: Leo Li Date: Thu, 18 Apr 2019 15:53:58 +0000 (-0400) Subject: drm/amdgpu: Check if SW SMU is supported before accessing funcs X-Git-Tag: v5.2-rc1~118^2~4^2~27 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=bb20be7510203db17c6c09f888cf328e307f1701;p=linux.git drm/amdgpu: Check if SW SMU is supported before accessing funcs smu.ppt_funcs is only initialized for ASICs supporting SW SMU. On a Hawaii ASIC, attempting to access the udev attribute ATTRS{power_dpm_state} will cause a null pointer deref in amdgpu_get_dpm_state() because of this. Fix by checking if SW SMU is supported first. Signed-off-by: Leo Li Reviewed-by: Alex Deucher Reviewed-by: Huang Rui Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c index 4b7a076eea9c..95144e49c7f9 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c @@ -144,7 +144,7 @@ static ssize_t amdgpu_get_dpm_state(struct device *dev, struct amdgpu_device *adev = ddev->dev_private; enum amd_pm_state_type pm; - if (adev->smu.ppt_funcs->get_current_power_state) + if (is_support_sw_smu(adev) && adev->smu.ppt_funcs->get_current_power_state) pm = amdgpu_smu_get_current_power_state(adev); else if (adev->powerplay.pp_funcs->get_current_power_state) pm = amdgpu_dpm_get_current_power_state(adev);