linux-kernel - [PATCH] ath5k: Fix debugfs_create

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Date:   Sun, 30 Jul 2023 19:38:20 -0700
From:   Atul Raut <rauji.raut@...il.com>
To:     jirislaby@...nel.org, mickflemm@...il.com, mcgrof@...nel.org,
        kvalo@...nel.org
Cc:     linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: [PATCH] ath5k: Fix debugfs_create_dir error checking

The debugfs_create_dir function returns ERR_PTR
in case of error and the correct way to check an
error is 'IS_ERR' inline function.
This patch will replace the null-comparison with IS_ERR

This issue was found with the help of Coccinelle.
./drivers/net/wireless/ath/ath5k/debug.c:985:6-12: Wrong debugfs call error processing on line 985

Signed-off-by: Atul Raut <rauji.raut@...il.com>
---
 drivers/net/wireless/ath/ath5k/debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath5k/debug.c b/drivers/net/wireless/ath/ath5k/debug.c
index 4b41160e5d38..08058b3f7e22 100644
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -982,7 +982,7 @@ ath5k_debug_init_device(struct ath5k_hw *ah)
 	ah->debug.level = ath5k_debug;
 
 	phydir = debugfs_create_dir("ath5k", ah->hw->wiphy->debugfsdir);
-	if (!phydir)
+	if (IS_ERR(phydir))
 		return;
 
 	debugfs_create_file("debug", 0600, phydir, ah, &fops_debug);
-- 
2.34.1