[PATCH v4 05/15] drm/amdgpu: validate hw_fini before function call

[Sunil Khatri <sunil.khatri@xxxxxxx>]

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@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 33 ++++++++++++++--------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index cf84b50f2355..96cecd4a636b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3287,11 +3287,17 @@ 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);
+			if (!adev->ip_blocks[i].version->funcs->hw_fini) {
+				DRM_ERROR("hw_fini of IP block <%s> not defined\n",
+						adev->ip_blocks[i].version->funcs->name);
+			} else {
+				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;
 			break;
@@ -3325,12 +3331,17 @@ static int amdgpu_device_ip_fini_early(struct amdgpu_device *adev)
 	for (i = adev->num_ip_blocks - 1; i >= 0; i--) {
 		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);
+		if (!adev->ip_blocks[i].version->funcs->hw_fini) {
+			DRM_ERROR("hw_fini of IP block <%s> not defined\n",
+				  adev->ip_blocks[i].version->funcs->name);
+		} else {
+			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;
-- 
2.34.1