drm/amdgpu: Add a check to avoid panic because of unexpected irqs

IP initialize ras in late_init, because of the BUGs of PSP or any
other components, driver receives unexpected irqs. It is ok to add such
check anyway.

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c

@@ -4840,10 +4840,16 @@ static int gfx_v9_0_cp_ecc_error_irq(struct amdgpu_device *adev,
 				  struct amdgpu_irq_src *source,
 				  struct amdgpu_iv_entry *entry)
 {
+	struct ras_common_if *ras_if = adev->gfx.ras_if;
 	struct ras_dispatch_if ih_data = {
-		.head = *adev->gfx.ras_if,
 		.entry = entry,
 	};
+
+	if (!ras_if)
+		return 0;
+
+	ih_data.head = *ras_if;
+
 	DRM_ERROR("CP ECC ERROR IRQ\n");
 	amdgpu_ras_interrupt_dispatch(adev, &ih_data);
 	return 0;

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -248,10 +248,16 @@ static int gmc_v9_0_process_ecc_irq(struct amdgpu_device *adev,
 		struct amdgpu_irq_src *source,
 		struct amdgpu_iv_entry *entry)
 {
+	struct ras_common_if *ras_if = adev->gmc.ras_if;
 	struct ras_dispatch_if ih_data = {
-		.head = *adev->gmc.ras_if,
 		.entry = entry,
 	};
+
+	if (!ras_if)
+		return 0;
+
+	ih_data.head = *ras_if;
+
 	amdgpu_ras_interrupt_dispatch(adev, &ih_data);
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c

@@ -1865,10 +1865,16 @@ static int sdma_v4_0_process_ecc_irq(struct amdgpu_device *adev,
 				      struct amdgpu_irq_src *source,
 				      struct amdgpu_iv_entry *entry)
 {
+	struct ras_common_if *ras_if = adev->sdma.ras_if;
 	struct ras_dispatch_if ih_data = {
-		.head = *adev->sdma.ras_if,
 		.entry = entry,
 	};
+
+	if (!ras_if)
+		return 0;
+
+	ih_data.head = *ras_if;
+
 	amdgpu_ras_interrupt_dispatch(adev, &ih_data);
 	return 0;
 }