diff --git a/arch/loongarch/configs/loongson_2k300_defconfig b/arch/loongarch/configs/loongson_2k300_defconfig
index c64f8d8a2..e37a1c24d 100644
--- a/arch/loongarch/configs/loongson_2k300_defconfig
+++ b/arch/loongarch/configs/loongson_2k300_defconfig
@@ -505,8 +505,8 @@ CONFIG_INPUT_TOUCHSCREEN=y
 CONFIG_TOUCHSCREEN_GOODIX=y
 CONFIG_INPUT_MISC=y
 CONFIG_INPUT_UINPUT=m
-CONFIG_SERIO_SERPORT=m
-CONFIG_SERIO_LIBPS2=y
+CONFIG_SERIO=m
+CONFIG_SERIO_LIBPS2=m
 CONFIG_SERIO_RAW=m
 CONFIG_LEGACY_PTY_COUNT=16
 CONFIG_SERIAL_8250=y
diff --git a/arch/loongarch/kernel/setup.c b/arch/loongarch/kernel/setup.c
index 32a242e54..5e643a6b4 100644
--- a/arch/loongarch/kernel/setup.c
+++ b/arch/loongarch/kernel/setup.c
@@ -296,18 +296,20 @@ static void __init arch_reserve_crashkernel(void)
 static void* __init get_fdt_by_board_name(void)
 {
 	void *fdt = NULL;
-	char* board_name;
-	char temp[128]; // 不想申请空间 应该不会有这么长的名字吧
+	char *board_name = NULL;
+	char temp[128]; // 名字长度限定不超128
+
 	board_name = strstr(boot_command_line, board_name_desc);
 	if (board_name) {
-		int i;
-		memset(temp, 0, 128);
+		size_t max_len = sizeof(temp);
+		memset(temp, 0, max_len);
+		max_len -= 1;
+
 		board_name += strlen(board_name_desc); // 跳过 = 和前面的字段
-		for (i = 0; i < 127; ++i) {
-			if (board_name[i] == 0 || board_name[i] == ' ')
-				break;
-			temp[i] = board_name[i];
-		}
+		size_t len = strcspn(board_name, " ");
+		len = len > max_len ? max_len : len;
+		memcpy(temp, board_name, len);
+		temp[len] = '\0';
 		board_name = temp;
 	}
 	if (board_name) {
@@ -834,20 +836,21 @@ static __init int parse_extlist(struct boot_params *bp)
 
 static int __init bp_start_match(void)
 {
-	char* bp_start_value;
-	char temp[128]; // 不想申请空间 应该不会有这么长的值吧
+	char *bp_start_value = NULL;
+	char temp[128];
 
 	bp_start = 0;
 	bp_start_value = strstr(boot_command_line, bp_start_desc);
 	if (bp_start_value) {
-		int i;
-		memset(temp, 0, 128);
+		size_t max_len = sizeof(temp);
+		memset(temp, 0, max_len);
+		max_len -= 1;
+
 		bp_start_value += strlen(bp_start_desc); // 跳过 = 和前面的字段
-		for (i = 0; i < 127; ++i) {
-			if (bp_start_value[i] == 0 || bp_start_value[i] == ' ')
-				break;
-			temp[i] = bp_start_value[i];
-		}
+		size_t len = strcspn(bp_start_value, " ");
+		len  = len > max_len ? max_len : len;
+		memcpy(temp, bp_start_value, len);
+		temp[len] = '\0';
 		bp_start_value = temp;
 	} else
 		return 1;
diff --git a/drivers/mmc/host/ls2kmci.c b/drivers/mmc/host/ls2kmci.c
index 66d381a3b..7f21d8681 100644
--- a/drivers/mmc/host/ls2kmci.c
+++ b/drivers/mmc/host/ls2kmci.c
@@ -1033,7 +1033,6 @@ probe_free_host:
 static void ls2k_mci_shutdown(struct platform_device *pdev)
 {
 	struct mmc_host	*mmc = platform_get_drvdata(pdev);
-	struct ls2k_mci_host    *host = mmc_priv(mmc);
 
 	if (mmc->caps & MMC_CAP_NONREMOVABLE)
 		return;