From: Yufeng Mo <moyufeng@huawei.com>
Date: Sat, 9 May 2020 17:27:40 +0800
Subject: net: hns3: optimized the judgment of the input parameters of dump ncl
 config
Patch-mainline: v5.8-rc1
Git-commit: b4401a044a1e6397d21806c210dd0d9b4da93e27
References: jsc#SLE-14777

This patch optimizes the judgment of the input parameters of dump ncl
config by checking the number and value of the input parameters apart.
It's clearer and more reasonable.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c |   15 ++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
@@ -1258,6 +1258,7 @@ static void hclge_dbg_dump_ncl_config(st
 {
 #define HCLGE_MAX_NCL_CONFIG_OFFSET	4096
 #define HCLGE_NCL_CONFIG_LENGTH_IN_EACH_CMD	(20 + 24 * 4)
+#define HCLGE_NCL_CONFIG_PARAM_NUM	2
 
 	struct hclge_desc desc[HCLGE_CMD_NCL_CONFIG_BD_NUM];
 	int bd_num = HCLGE_CMD_NCL_CONFIG_BD_NUM;
@@ -1267,13 +1268,17 @@ static void hclge_dbg_dump_ncl_config(st
 	int ret;
 
 	ret = sscanf(cmd_buf, "%x %x", &offset, &length);
-	if (ret != 2 || offset >= HCLGE_MAX_NCL_CONFIG_OFFSET ||
-	    length > HCLGE_MAX_NCL_CONFIG_OFFSET - offset) {
-		dev_err(&hdev->pdev->dev, "Invalid offset or length.\n");
+	if (ret != HCLGE_NCL_CONFIG_PARAM_NUM) {
+		dev_err(&hdev->pdev->dev,
+			"Too few parameters, num = %d.\n", ret);
 		return;
 	}
-	if (offset < 0 || length <= 0) {
-		dev_err(&hdev->pdev->dev, "Non-positive offset or length.\n");
+
+	if (offset < 0 || offset >= HCLGE_MAX_NCL_CONFIG_OFFSET ||
+	    length <= 0 || length > HCLGE_MAX_NCL_CONFIG_OFFSET - offset) {
+		dev_err(&hdev->pdev->dev,
+			"Invalid input, offset = %d, length = %d.\n",
+			offset, length);
 		return;
 	}