drm/amdgpu: Check if SW SMU is supported before accessing funcs

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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 <sunpeng.li@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

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Leo Li 2019-04-18 11:53:58 -04:00 • committed by Alex Deucher

parent 3b8cea6f64

commit bb20be7510

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c

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