drm/amdgpu: validate hw_fini before function call

Before making a function call to hw_fini, validate
the function pointer like we do in sw_init.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -3269,6 +3269,25 @@ static int amdgpu_device_ip_late_init(struct amdgpu_device *adev)
 	return 0;
 }
 
+static void amdgpu_ip_block_hw_fini(struct amdgpu_ip_block *ip_block)
+{
+	int r;
+
+	if (ip_block->version->funcs->hw_fini) {
+		DRM_ERROR("hw_fini of IP block <%s> not defined\n",
+			  ip_block->version->funcs->name);
+	} else {
+		r = ip_block->version->funcs->hw_fini(ip_block);
+		/* XXX handle errors */
+		if (r) {
+			DRM_DEBUG("hw_fini of IP block <%s> failed %d\n",
+				  ip_block->version->funcs->name, r);
+		}
+	}
+
+	ip_block->status.hw = false;
+}
+
 /**
  * amdgpu_device_smu_fini_early - smu hw_fini wrapper
  *
@@ -3278,7 +3297,7 @@ static int amdgpu_device_ip_late_init(struct amdgpu_device *adev)
  */
 static void amdgpu_device_smu_fini_early(struct amdgpu_device *adev)
 {
-	int i, r;
+	int i;
 
 	if (amdgpu_ip_version(adev, GC_HWIP, 0) > IP_VERSION(9, 0, 0))
 		return;
@@ -3287,13 +3306,7 @@ static void amdgpu_device_smu_fini_early(struct amdgpu_device *adev)
 		if (!adev->ip_blocks[i].status.hw)
 			continue;
 		if (adev->ip_blocks[i].version->type == AMD_IP_BLOCK_TYPE_SMC) {
-			r = adev->ip_blocks[i].version->funcs->hw_fini(&adev->ip_blocks[i]);
-			/* XXX handle errors */
-			if (r) {
-				DRM_DEBUG("hw_fini of IP block <%s> failed %d\n",
-					  adev->ip_blocks[i].version->funcs->name, r);
-			}
-			adev->ip_blocks[i].status.hw = false;
+			amdgpu_ip_block_hw_fini(&adev->ip_blocks[i]);
 			break;
 		}
 	}
@@ -3326,14 +3339,7 @@ static int amdgpu_device_ip_fini_early(struct amdgpu_device *adev)
 		if (!adev->ip_blocks[i].status.hw)
 			continue;
 
-		r = adev->ip_blocks[i].version->funcs->hw_fini(&adev->ip_blocks[i]);
-		/* XXX handle errors */
-		if (r) {
-			DRM_DEBUG("hw_fini of IP block <%s> failed %d\n",
-				  adev->ip_blocks[i].version->funcs->name, r);
-		}
-
-		adev->ip_blocks[i].status.hw = false;
+		amdgpu_ip_block_hw_fini(&adev->ip_blocks[i]);
 	}
 
 	if (amdgpu_sriov_vf(adev)) {