[PATCH 11/23] drm/amdgpu: check function points valid before use.

[Alex Deucher]

From: Rex Zhu <Rex.Zhu at amd.com>

Signed-off-by: Rex Zhu <Rex.Zhu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 78b3b0b..5854357 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1191,9 +1191,10 @@ int amdgpu_set_clockgating_state(struct amdgpu_device *adev,
 	for (i = 0; i < adev->num_ip_blocks; i++) {
 		if (!adev->ip_blocks[i].status.valid)
 			continue;
-		if (adev->ip_blocks[i].version->type == block_type) {
-			r = adev->ip_blocks[i].version->funcs->set_clockgating_state((void *)adev,
-										     state);
+		if (adev->ip_blocks[i].version->type == block_type &&
+			adev->ip_blocks[i].version->funcs->set_clockgating_state) {
+			r = adev->ip_blocks[i].version->funcs->set_clockgating_state(
+							(void *)adev, state);
 			if (r)
 				return r;
 			break;
@@ -1211,9 +1212,10 @@ int amdgpu_set_powergating_state(struct amdgpu_device *adev,
 	for (i = 0; i < adev->num_ip_blocks; i++) {
 		if (!adev->ip_blocks[i].status.valid)
 			continue;
-		if (adev->ip_blocks[i].version->type == block_type) {
-			r = adev->ip_blocks[i].version->funcs->set_powergating_state((void *)adev,
-										     state);
+		if (adev->ip_blocks[i].version->type == block_type &&
+			adev->ip_blocks[i].version->funcs->set_powergating_state) {
+			r = adev->ip_blocks[i].version->funcs->set_powergating_state(
+							(void *)adev, state);
 			if (r)
 				return r;
 			break;
-- 
2.5.5