[PATCH 6.19 225/844] drm/amd/pm: Fix null pointer dereference issue

[Sasha Levin]

From: Jinzhou Su <jinzhou.su@xxxxxxx>

[ Upstream commit 1197366cca89a4c44c541ddedb8ce8bf0757993d ]

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

Signed-off-by: Jinzhou Su <jinzhou.su@xxxxxxx>
Reviewed-by: Yang Wang <kevinyang.wang@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index f51fa265230b3..2a0e826d0317d 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -618,6 +618,9 @@ 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);
 
-- 
2.51.0