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

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Date:   Wed, 11 May 2022 09:45:40 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>,
        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>,
        linux-wireless@...r.kernel.org,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: rtlwifi: Use pr_warn_once instead of WARN_ONCE

On Tue, May 10, 2022 at 11:37 PM Kalle Valo <kvalo@...nel.org> wrote:
>
> 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.

Yes, this is better. Already sent a v2 patch.

>
> --
> https://patchwork.kernel.org/project/linux-wireless/list/
>
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches