linux-kernel - Re: [PATCH] net: ethernet: mtk_eth_soc: fix error check return value of debugfs_create

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Date:   Tue, 19 Apr 2022 14:03:30 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     cgel.zte@...il.com
Cc:     f.fainelli@...il.com, bcm-kernel-feedback-list@...adcom.com,
        hkallweit1@...il.com, linux@...linux.org.uk, davem@...emloft.net,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] net: ethernet: mtk_eth_soc: fix error check return value
 of debugfs_create_dir()

On Tue, Apr 19, 2022 at 01:40:56AM +0000, cgel.zte@...il.com wrote:
> From: Lv Ruyi <lv.ruyi@....com.cn>
> 
> If an error occurs, debugfs_create_file() will return ERR_PTR(-ERROR),
> so use IS_ERR() to check it.
> 
> Fixes: 804775dfc288 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
> ---
>  drivers/net/ethernet/mediatek/mtk_wed_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c b/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c
> index a81d3fd1a439..0c284c18a8d7 100644
> --- a/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c
> +++ b/drivers/net/ethernet/mediatek/mtk_wed_debugfs.c
> @@ -165,7 +165,7 @@ void mtk_wed_hw_add_debugfs(struct mtk_wed_hw *hw)
>  
>  	snprintf(hw->dirname, sizeof(hw->dirname), "wed%d", hw->index);
>  	dir = debugfs_create_dir(hw->dirname, NULL);
> -	if (!dir)
> +	if (IS_ERR(dir))
>  		return;

You should not check the return value from any debugfs calls.

If Zeal bot is saying you should, Zeal is broken/does not understand
debugfs.

   Andrew