linux-kernel - Re: [PATCH v1] drivers: wireless: mt76: fix parameter check in mt76_register_debugfs

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Message-Id: <CU08XUB327HO.3J4AY0JF2ZRL3@syracuse>
Date:   Wed, 12 Jul 2023 16:00:20 +0200
From:   "Nicolas Escande" <nico.escande@...il.com>
To:     "Minjie Du" <duminjie@...o.com>, "Felix Fietkau" <nbd@....name>,
        "Lorenzo Bianconi" <lorenzo@...nel.org>,
        "Ryder Lee" <ryder.lee@...iatek.com>,
        "Shayne Chen" <shayne.chen@...iatek.com>,
        "Sean Wang" <sean.wang@...iatek.com>,
        "Kalle Valo" <kvalo@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        "AngeloGioacchino Del Regno" 
        <angelogioacchino.delregno@...labora.com>,
        "open list:MEDIATEK MT76 WIRELESS LAN DRIVER" 
        <linux-wireless@...r.kernel.org>,
        "open list:ARM/Mediatek SoC support" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Cc:     <opensource.kernel@...o.com>
Subject: Re: [PATCH v1] drivers: wireless: mt76: fix parameter check in
 mt76_register_debugfs_fops()

On Wed Jul 12, 2023 at 3:00 PM CEST, Minjie Du wrote:
> Make IS_ERR() judge the debugfs_create_dir() function return
> in mt76_register_debugfs_fops().
>
> Signed-off-by: Minjie Du <duminjie@...o.com>
> ---
>  drivers/net/wireless/mediatek/mt76/debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/mediatek/mt76/debugfs.c b/drivers/net/wireless/mediatek/mt76/debugfs.c
> index 57fbcc83e..d9ba70013 100644
> --- a/drivers/net/wireless/mediatek/mt76/debugfs.c
> +++ b/drivers/net/wireless/mediatek/mt76/debugfs.c
> @@ -109,7 +109,7 @@ mt76_register_debugfs_fops(struct mt76_phy *phy,
>  	struct dentry *dir;
>  
>  	dir = debugfs_create_dir("mt76", phy->hw->wiphy->debugfsdir);
> -	if (!dir)
> +	if (IS_ERR(dir))
>  		return NULL;

Check the mailing list this subject has been discussed many times...
I believe the current state of the art is to remove the check altogether

>  
>  	debugfs_create_u8("led_pin", 0600, dir, &phy->leds.pin);