linux-kernel - Re: [PATCH 4.19 035/148] wifi: mwifiex: debugfs: Drop unnecessary error check for debugfs_create

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Date: Thu, 28 Mar 2024 11:34:04 +0100
From: Pavel Machek <pavel@...x.de>
To: Sasha Levin <sashal@...nel.org>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Jinjie Ruan <ruanjinjie@...wei.com>,
	Russell King <linux@...linux.org.uk>, Kalle Valo <kvalo@...nel.org>
Subject: Re: [PATCH 4.19 035/148] wifi: mwifiex: debugfs: Drop unnecessary
 error check for debugfs_create_dir()

Hi!

> From: Jinjie Ruan <ruanjinjie@...wei.com>
> 
> [ Upstream commit 50180c7f8e3de7c2d87f619131776598fcb1478d ]
> 
> debugfs_create_dir() returns ERR_PTR and never return NULL.
> 
> As Russell suggested, this patch removes the error checking for
> debugfs_create_dir(). This is because the DebugFS kernel API is developed
> in a way that the caller can safely ignore the errors that occur during
> the creation of DebugFS nodes. The debugfs APIs have a IS_ERR() judge in
> start_creating() which can handle it gracefully. So these checks are
> unnecessary.

Additional error handling does not break anything.

This does not fix a bug, and thus does not belong into stable.

Best regards,
								Pavel
								
> +++ b/drivers/net/wireless/marvell/mwifiex/debugfs.c
> @@ -977,9 +977,6 @@ mwifiex_dev_debugfs_init(struct mwifiex_private *priv)
>  	priv->dfs_dev_dir = debugfs_create_dir(priv->netdev->name,
>  					       mwifiex_dfs_dir);
>  
> -	if (!priv->dfs_dev_dir)
> -		return;
> -
>  	MWIFIEX_DFS_ADD_FILE(info);
>  	MWIFIEX_DFS_ADD_FILE(debug);
>  	MWIFIEX_DFS_ADD_FILE(getlog);

-- 
DENX Software Engineering GmbH,        Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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