video/rockchip: rga2: Fix some errors.

Signed-off-by: Yu Qiaowei <cerf.yu@rock-chips.com>
Change-Id: I2bc574f6423da23d44a0b5361e216854636d83a0

Author: Yu Qiaowei

drivers/video/rockchip/rga2/rga2_drv.c

@@ -2036,7 +2036,9 @@ static void RGA2_flush_page(void)
 	reg = list_entry(rga2_service.running.prev,
 			 struct rga2_reg, status_link);
 
-	if (reg == NULL && reg->MMU_base == NULL)
+	if (reg == NULL)
+		return;
+	if (reg->MMU_base == NULL)
 		return;
 
 	for (i = 0; i < reg->MMU_count; i++)

drivers/video/rockchip/rga2/rga2_mmu_info.c

@@ -556,8 +556,10 @@ static int rga2_mmu_flush_cache(struct rga2_reg *reg, struct rga2_req *req)
 	DstPageCount = 0;
 	DstStart = 0;
 
-	if (reg->MMU_map != true)
+	if (reg->MMU_map != true) {
+		status = -EINVAL;
 		goto out;
+	}
 
 	/* cal dst buf mmu info */
 	if (req->mmu_info.dst_mmu_flag & 1) {
@@ -589,6 +591,7 @@ static int rga2_mmu_flush_cache(struct rga2_reg *reg, struct rga2_req *req)
 	mutex_unlock(&rga2_service.lock);
 	if (DstMemSize) {
 		if (req->sg_dst) {
+			status = -EINVAL;
 			goto out;
 		} else {
 			ret = rga2_MapUserMemory(&pages[0],
@@ -1128,6 +1131,8 @@ static int rga2_mmu_info_update_patten_buff_mode(struct rga2_reg *reg, struct rg
         pages = rga2_mmu_buf.pages;
 
         MMU_Base = kzalloc(AllSize * sizeof(uint32_t), GFP_KERNEL);
+	if (MMU_Base == NULL)
+		return -EINVAL;
 
         for(i=0; i<CMDMemSize; i++) {
             MMU_Base[i] = virt_to_phys((uint32_t *)((CMDStart + i) << PAGE_SHIFT));