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

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Date:   Thu, 13 Jul 2023 09:00:20 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     王明-软件底层技术部 
        <machel@...o.com>
Cc:     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>,
        "ntb@...ts.linux.dev" <ntb@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        "opensource.kernel" <opensource.kernel@...o.com>
Subject: Re: 回复: [PATCH v2] ntb:Fix an NULL vs IS_ERR() bug for
 debugfs_create_dir() in tool_setup_dbgfs()

On Thu, Jul 13, 2023 at 02:13:32AM +0000, 王明-软件底层技术部 wrote:
> Hi dan carpenter
> You mean that this modification is correct, but there is no need to do
> so, is that the understanding?

No, this patch is wrong.  Possibly harmless, possibly harmful but either
way it is wrong.  The correct way is:

diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index eeeb4b1c97d2..e0acc11d29ba 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -1495,8 +1495,6 @@ 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)
-		return;
 
 	debugfs_create_file("port", 0600, tc->dbgfs_dir,
 			    tc, &tool_port_fops);