drm/amdgpu: Don't leak runtime pm ref on driver unload
amdgpu_driver_load_kms() calls pm_runtime_put_autosuspend() if amdgpu_device_is_px(dev), but amdgpu_driver_unload_kms() calls pm_runtime_get_sync() unconditionally. We therefore leak a runtime pm ref whenever amdgpu is unloaded on a non-PX machine or if runpm=0. The GPU will subsequently never runtime suspend after loading amdgpu again. Fix by taking the runtime pm ref under the same condition that it was released on driver load. Fixes: d38ceaf9 ("drm/amdgpu: add core driver (v4)") Cc: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: NLukas Wunner <lukas@wunner.de> Acked-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/86364eeb5711323608930c4f0f69046792ff6d3c.1465392124.git.lukas@wunner.de
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