linux-kernel - Re: [PATCH AUTOSEL 4.14 4/6] nfcsim.c: Fix error checking for debugfs_create

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Message-ID: <ZIy5ecuHQUP1wUu2@duo.ucw.cz>
Date:   Fri, 16 Jun 2023 21:35:21 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Osama Muhammad <osmtendev@...il.com>,
        Simon Horman <simon.horman@...igine.com>,
        "David S . Miller" <davem@...emloft.net>,
        krzysztof.kozlowski@...aro.org, netdev@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.14 4/6] nfcsim.c: Fix error checking for
 debugfs_create_dir

Hi!

> [ Upstream commit 9b9e46aa07273ceb96866b2e812b46f1ee0b8d2f ]
> 
> This patch fixes the error checking in nfcsim.c.
> 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.

I don't think this is good idea; user will wonder why he can't see
debugfs files, and pr_err() is quite suitable way to handle this.

Anyway, this does not really fix a bug, so we should not be putting it
into stable.

Best regards,
								Pavel

>  drivers/nfc/nfcsim.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/nfc/nfcsim.c b/drivers/nfc/nfcsim.c
> index 533e3aa6275cd..cf07b366500e9 100644
> --- a/drivers/nfc/nfcsim.c
> +++ b/drivers/nfc/nfcsim.c
> @@ -345,10 +345,6 @@ static struct dentry *nfcsim_debugfs_root;
>  static void nfcsim_debugfs_init(void)
>  {
>  	nfcsim_debugfs_root = debugfs_create_dir("nfcsim", NULL);
> -
> -	if (!nfcsim_debugfs_root)
> -		pr_err("Could not create debugfs entry\n");
> -
>  }
>  
>  static void nfcsim_debugfs_remove(void)

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

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