linux-kernel - Re: [PATCH] driver: net: can: delete napi if register

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Message-ID: <20211017123622.nfyis7o235tb2qad@pengutronix.de>
Date:   Sun, 17 Oct 2021 14:36:22 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     Appana Durga Kedareswara rao <appana.durga.rao@...inx.com>,
        Naga Sureshkumar Relli <naga.sureshkumar.relli@...inx.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-can@...r.kernel.org,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver: net: can: delete napi if register_candev fails

On 13.10.2021 13:21:09, Dongliang Mu wrote:
> On Wed, Oct 13, 2021 at 12:04 PM Dongliang Mu <mudongliangabcd@...il.com> wrote:
> >
> > If register_candev fails, xcan_probe does not clean the napi
> > created by netif_napi_add.
> >
> 
> It seems the netif_napi_del operation is done in the free_candev
> (free_netdev precisely).
> 
> list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
>           netif_napi_del(p);
> 
> And list_add_rcu(&napi->dev_list, &dev->napi_list) is done in the
> netif_napi_add.
> 
> Therefore, I suggest removing "netif_napi_del" operation in the
> xcan_remove to match probe and remove function.

Sounds reasonable, can you create a patch for this.

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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