drm/amd/pm: fix NULL pointer issue of amdgpu_smu_stb_debug_fs_init

Fix NULL pointer issue on amdgpu_smu_stb_debug_fs_init if SMU block not
enabled.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index f154475..904d516 100644 (file)
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -3031,7 +3031,7 @@ void amdgpu_smu_stb_debug_fs_init(struct amdgpu_device *adev)
 
        struct smu_context *smu = adev->powerplay.pp_handle;
 
-       if (!smu->stb_context.stb_buf_size)
+       if (!smu || (!smu->stb_context.stb_buf_size))
                return;
 
        debugfs_create_file_size("amdgpu_smu_stb_dump",