drm/amd/pm: Fix null pointer dereference issue

If SMU is disabled, during RAS initialization,
there will be null pointer dereference issue here.

Signed-off-by: Jinzhou Su <jinzhou.su@amd.com>
Reviewed-by: Yang Wang <kevinyang.wang@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 6b6b05e..3f70731 100644 (file)
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -619,6 +619,9 @@ int amdgpu_smu_ras_send_msg(struct amdgpu_device *adev, enum smu_message_type ms
        struct smu_context *smu = adev->powerplay.pp_handle;
        int ret = -EOPNOTSUPP;
 
+       if (!smu)
+               return ret;
+
        if (smu->ppt_funcs && smu->ppt_funcs->ras_send_msg)
                ret = smu->ppt_funcs->ras_send_msg(smu, msg, param, read_arg);