linux-kernel - Re: [PATCH] net: rtlwifi: Use pr_warn_once instead of WARN

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Date:   Tue, 10 May 2022 18:36:51 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Dongliang Mu <dzm91@...t.edu.cn>
Cc:     Ping-Ke Shih <pkshih@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Dongliang Mu <mudongliangabcd@...il.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: rtlwifi: Use pr_warn_once instead of WARN_ONCE

Dongliang Mu <dzm91@...t.edu.cn> writes:

> From: Dongliang Mu <mudongliangabcd@...il.com>
>
> This memory allocation failure can be triggered by fault injection or
> high pressure testing, resulting a WARN.
>
> Fix this by replacing WARN with pr_warn_once.
>
> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
> ---
>  drivers/net/wireless/realtek/rtlwifi/usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/usb.c b/drivers/net/wireless/realtek/rtlwifi/usb.c
> index 86a236873254..acb0c15e9748 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/usb.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/usb.c
> @@ -1014,7 +1014,7 @@ int rtl_usb_probe(struct usb_interface *intf,
>  	hw = ieee80211_alloc_hw(sizeof(struct rtl_priv) +
>  				sizeof(struct rtl_usb_priv), &rtl_ops);
>  	if (!hw) {
> -		WARN_ONCE(true, "rtl_usb: ieee80211 alloc failed\n");
> +		pr_warn_once("rtl_usb: ieee80211 alloc failed\n");
>  		return -ENOMEM;
>  	}
>  	rtlpriv = hw->priv;

I think we should warn every time ieee80211_alloc_hw() fails, it's
called only once per device initialisation, so pr_warn() is more
approriate.

-- 
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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches