linux-kernel - [PATCH v2] ntb:Fix an NULL vs IS_ERR() bug for debugfs_create_dir() in tool_setup

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Date:   Wed, 12 Jul 2023 20:39:59 +0800
From:   Wang Ming <machel@...o.com>
To:     Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Dan Carpenter <error27@...il.com>,
        Jiasheng Jiang <jiasheng@...as.ac.cn>,
        Wang Ming <machel@...o.com>, ntb@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: [PATCH v2] ntb:Fix an NULL vs IS_ERR() bug for debugfs_create_dir() in tool_setup_dbgfs()

The debugfs_create_dir() function returns error pointers.
It never returns NULL. Most incorrect error checks were fixed,
but the one in tool_setup_dbgfs() was forgotten.

Fix the remaining error check.

Signed-off-by: Wang Ming <machel@...o.com>
---
 drivers/ntb/test/ntb_tool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index eeeb4b1c97d2..4fa69ea4331d 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -1495,7 +1495,7 @@ static void tool_setup_dbgfs(struct tool_ctx *tc)
 
 	tc->dbgfs_dir = debugfs_create_dir(dev_name(&tc->ntb->dev),
 					   tool_dbgfs_topdir);
-	if (!tc->dbgfs_dir)
+	if (IS_ERR(tc->dbgfs_dir))
 		return;
 
 	debugfs_create_file("port", 0600, tc->dbgfs_dir,
-- 
2.25.1