drm/msm/a6xx: Replace kcalloc() with kvzalloc()

In order to reduce chance of allocation failure while capturing a6xx
gpu state, use kvzalloc() instead of kcalloc() in state_kcalloc().

Indirectly, this patch helps to fix leaking memory allocated for
gmu_debug object.

Fixes: b859f9b (drm/msm/gpu: Snapshot GMU debug buffer)
Signed-off-by: Akhil P Oommen <[email protected]>
Patchwork: https://patchwork.freedesktop.org/patch/505074/
Link: https://lore.kernel.org/r/20220928124830.1.I8ea24a8d586b4978823b848adde000f92f74d5c2@changeid
Signed-off-by: Rob Clark <[email protected]>

Author: Akhil P Oommen

drivers/gpu/drm/msm/adreno/a6xx_gpu_state.c

@@ -91,7 +91,7 @@ struct a6xx_state_memobj {
 static void *state_kcalloc(struct a6xx_gpu_state *a6xx_state, int nr, size_t objsize)
 {
 	struct a6xx_state_memobj *obj =
-		kzalloc((nr * objsize) + sizeof(*obj), GFP_KERNEL);
+		kvzalloc((nr * objsize) + sizeof(*obj), GFP_KERNEL);
 
 	if (!obj)
 		return NULL;
@@ -819,7 +819,7 @@ static struct msm_gpu_state_bo *a6xx_snapshot_gmu_bo(
 
 	snapshot->iova = bo->iova;
 	snapshot->size = bo->size;
-	snapshot->data = kvzalloc(snapshot->size, GFP_KERNEL);
+	snapshot->data = state_kcalloc(a6xx_state, 1, snapshot->size);
 	if (!snapshot->data)
 		return NULL;
 
@@ -1034,14 +1034,8 @@ static void a6xx_gpu_state_destroy(struct kref *kref)
 	struct a6xx_gpu_state *a6xx_state = container_of(state,
 			struct a6xx_gpu_state, base);
 
-	if (a6xx_state->gmu_log)
-		kvfree(a6xx_state->gmu_log->data);
-
-	if (a6xx_state->gmu_hfi)
-		kvfree(a6xx_state->gmu_hfi->data);
-
 	list_for_each_entry_safe(obj, tmp, &a6xx_state->objs, node)
-		kfree(obj);
+		kvfree(obj);
 
 	adreno_gpu_state_destroy(state);
 	kfree(a6xx_state);