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Date:   Fri, 8 May 2020 10:06:49 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Colin Ian King <colin.king@...onical.com>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Wei Yongjun <weiyongjun1@...wei.com>, <netdev@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>, Hulk Robot <hulkci@...wei.com>
Subject: [PATCH net-next v2] net: ethernet: ti: fix some return value check of cpsw_ale_create()

cpsw_ale_create() can return both NULL and PTR_ERR(), but all of
the caller only check NULL for error handling. This patch convert
it to only return PTR_ERR() in all error cases, all the caller using
IS_ERR() install of NULL test.

Also fix a return negative error code from the cpsw_ale_create()
error handling case instead of 0 in am65_cpsw_nuss_probe().

Fixes: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Fixes: 4b41d3436796 ("net: ethernet: ti: cpsw: allow untagged traffic on host port")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
v1 -> v2: fix cpsw_ale_create() to retuen PTR_ERR() in all places as Grygorii's suggest
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 3 ++-
 drivers/net/ethernet/ti/cpsw_ale.c       | 2 +-
 drivers/net/ethernet/ti/cpsw_priv.c      | 4 ++--
 drivers/net/ethernet/ti/netcp_ethss.c    | 4 ++--
 4 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 8cdbb2b9b13a..5530d7ef77a6 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2074,8 +2074,9 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 	ale_params.nu_switch_ale = true;
 
 	common->ale = cpsw_ale_create(&ale_params);
-	if (!common->ale) {
+	if (IS_ERR(common->ale)) {
 		dev_err(dev, "error initializing ale engine\n");
+		ret = ERR_PTR(common->ale);
 		goto err_of_clear;
 	}
 
diff --git a/drivers/net/ethernet/ti/cpsw_ale.c b/drivers/net/ethernet/ti/cpsw_ale.c
index 0374e6936091..8dc6be11b2ff 100644
--- a/drivers/net/ethernet/ti/cpsw_ale.c
+++ b/drivers/net/ethernet/ti/cpsw_ale.c
@@ -955,7 +955,7 @@ struct cpsw_ale *cpsw_ale_create(struct cpsw_ale_params *params)
 
 	ale = devm_kzalloc(params->dev, sizeof(*ale), GFP_KERNEL);
 	if (!ale)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	ale->p0_untag_vid_mask =
 		devm_kmalloc_array(params->dev, BITS_TO_LONGS(VLAN_N_VID),
diff --git a/drivers/net/ethernet/ti/cpsw_priv.c b/drivers/net/ethernet/ti/cpsw_priv.c
index 9d098c802c6d..d940628bff8d 100644
--- a/drivers/net/ethernet/ti/cpsw_priv.c
+++ b/drivers/net/ethernet/ti/cpsw_priv.c
@@ -504,9 +504,9 @@ int cpsw_init_common(struct cpsw_common *cpsw, void __iomem *ss_regs,
 	ale_params.ale_ports		= CPSW_ALE_PORTS_NUM;
 
 	cpsw->ale = cpsw_ale_create(&ale_params);
-	if (!cpsw->ale) {
+	if (IS_ERR(cpsw->ale)) {
 		dev_err(dev, "error initializing ale engine\n");
-		return -ENODEV;
+		return PTR_ERR(cpsw->ale);
 	}
 
 	dma_params.dev		= dev;
diff --git a/drivers/net/ethernet/ti/netcp_ethss.c b/drivers/net/ethernet/ti/netcp_ethss.c
index 9d6e27fb710e..28093923a7fb 100644
--- a/drivers/net/ethernet/ti/netcp_ethss.c
+++ b/drivers/net/ethernet/ti/netcp_ethss.c
@@ -3704,9 +3704,9 @@ static int gbe_probe(struct netcp_device *netcp_device, struct device *dev,
 		ale_params.nu_switch_ale = true;
 	}
 	gbe_dev->ale = cpsw_ale_create(&ale_params);
-	if (!gbe_dev->ale) {
+	if (IS_ERR(gbe_dev->ale)) {
 		dev_err(gbe_dev->dev, "error initializing ale engine\n");
-		ret = -ENODEV;
+		ret = PTR_ERR(gbe_dev->ale);
 		goto free_sec_ports;
 	} else {
 		dev_dbg(gbe_dev->dev, "Created a gbe ale engine\n");
-- 
2.20.1



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