linux-kernel - [PATCH] net: mvpp2: Fix error checking

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Message-Id: <20230517190811.367461-1-asuk4.q@gmail.com>
Date:   Thu, 18 May 2023 03:08:11 +0800
From:   Yeqi Fu <asuk4.q@...il.com>
To:     mw@...ihalf.com, linux@...linux.org.uk, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     Yeqi Fu <asuk4.q@...il.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ivan Orlov <ivan.orlov0322@...il.com>
Subject: [PATCH] net: mvpp2: Fix error checking

The function debugfs_create_dir returns ERR_PTR if an error occurs,
and the appropriate way to verify for errors is to use the inline
function IS_ERR. The patch will substitute the null-comparison with
IS_ERR.

Suggested-by: Ivan Orlov <ivan.orlov0322@...il.com>
Signed-off-by: Yeqi Fu <asuk4.q@...il.com>
---
 drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
index 75e83ea2a926..9c53f378edda 100644
--- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
+++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c
@@ -593,7 +593,7 @@ static int mvpp2_dbgfs_c2_entry_init(struct dentry *parent,
 	sprintf(c2_entry_name, "%03d", id);
 
 	c2_entry_dir = debugfs_create_dir(c2_entry_name, parent);
-	if (!c2_entry_dir)
+	if (IS_ERR(c2_entry_dir))
 		return -ENOMEM;
 
 	entry = &priv->dbgfs_entries->c2_entries[id];
@@ -626,7 +626,7 @@ static int mvpp2_dbgfs_flow_tbl_entry_init(struct dentry *parent,
 	sprintf(flow_tbl_entry_name, "%03d", id);
 
 	flow_tbl_entry_dir = debugfs_create_dir(flow_tbl_entry_name, parent);
-	if (!flow_tbl_entry_dir)
+	if (IS_ERR(flow_tbl_entry_dir))
 		return -ENOMEM;
 
 	entry = &priv->dbgfs_entries->flt_entries[id];
@@ -646,11 +646,11 @@ static int mvpp2_dbgfs_cls_init(struct dentry *parent, struct mvpp2 *priv)
 	int i, ret;
 
 	cls_dir = debugfs_create_dir("classifier", parent);
-	if (!cls_dir)
+	if (IS_ERR(cls_dir))
 		return -ENOMEM;
 
 	c2_dir = debugfs_create_dir("c2", cls_dir);
-	if (!c2_dir)
+	if (IS_ERR(c2_dir))
 		return -ENOMEM;
 
 	for (i = 0; i < MVPP22_CLS_C2_N_ENTRIES; i++) {
@@ -660,7 +660,7 @@ static int mvpp2_dbgfs_cls_init(struct dentry *parent, struct mvpp2 *priv)
 	}
 
 	flow_tbl_dir = debugfs_create_dir("flow_table", cls_dir);
-	if (!flow_tbl_dir)
+	if (IS_ERR(flow_tbl_dir))
 		return -ENOMEM;
 
 	for (i = 0; i < MVPP2_CLS_FLOWS_TBL_SIZE; i++) {
-- 
2.37.2