linux-kernel - Re: [PATCH net-next v3] wifi: ath9k: Remove error checking for debugfs_create

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Date:   Tue, 08 Aug 2023 15:28:57 +0200
From:   Toke Høiland-Jørgensen <toke@...e.dk>
To:     Wang Ming <machel@...o.com>, Kalle Valo <kvalo@...nel.org>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Wang Ming <machel@...o.com>
Subject: Re: [PATCH net-next v3] wifi: ath9k: Remove error checking for
 debugfs_create_dir()

Wang Ming <machel@...o.com> writes:

> It is expected that most callers should _ignore_ the errors
> return by debugfs_create_dir() in ath9k_htc_init_debug().
>
> Signed-off-by: Wang Ming <machel@...o.com>
> ---
>  drivers/net/wireless/ath/ath9k/htc_drv_debug.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
> index b3ed65e5c4da..85ad45771b44 100644
> --- a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
> +++ b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
> @@ -491,8 +491,6 @@ int ath9k_htc_init_debug(struct ath_hw *ah)
>  
>  	priv->debug.debugfs_phy = debugfs_create_dir(KBUILD_MODNAME,
>  					     priv->hw->wiphy->debugfsdir);
> -	if (!priv->debug.debugfs_phy)
> -		return -ENOMEM;

Hmm, so it's true that all the debugfs_create* functions deal correctly
with the dir pointer being an error pointer, which means that it's
possible to just ignore the return value of debugfs_create_dir() without
anything breaking. However, it also seems kinda pointless to have all
those calls if we know they're going to fail, so I prefer v1 of this
patch that just fixed the IS_ERR check. No need to resend, we can just
apply v1 instead...

-Toke