diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6da97f26f8a9..b33d2c98a11f 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -699,6 +699,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 #ifdef CONFIG_ROCKCHIP_THUNDER_BOOT
 	void *ecsd;
 	bool valid_ecsd = false;
+	bool valid_reserved = false;
 	struct device_node *mem;
 	struct resource reg;
 	struct device *dev = card->host->parent;
@@ -714,6 +715,7 @@ static int mmc_read_ext_csd(struct mmc_card *card)
 			dev_err(dev, "fail to get resource\n");
 			goto get_ecsd;
 		}
+		valid_reserved = true;
 
 		ecsd = mmc_tb_map_ecsd(reg.start, resource_size(&reg));
 		if (!ecsd)
@@ -765,6 +767,10 @@ decode:
 		kfree(ext_csd);
 	else
 		vunmap(ecsd);
+	if (valid_reserved)
+		free_reserved_area(phys_to_virt(reg.start),
+				   phys_to_virt(reg.start) + resource_size(&reg),
+				   -1, "memory-region-ecsd");
 #else
 	kfree(ext_csd);
 #endif