netdev - Re: [PATCH net] eth: sp7021: drop free_netdev() from spl2sw_init

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Date:   Wed, 9 Nov 2022 23:03:36 +0100
From:   Francois Romieu <romieu@...zoreil.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Wei Yongjun <weiyongjun@...weicloud.com>,
        Wells Lu <wellslutw@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
        Wei Yongjun <weiyongjun1@...wei.com>, netdev@...r.kernel.org
Subject: Re: [PATCH net] eth: sp7021: drop free_netdev() from
 spl2sw_init_netdev()

Eric Dumazet <edumazet@...gle.com> :
[...]
> > diff --git a/drivers/net/ethernet/sunplus/spl2sw_driver.c b/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > index 9be585237277..c499a14314f1 100644
> > --- a/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > +++ b/drivers/net/ethernet/sunplus/spl2sw_driver.c
> > @@ -287,7 +287,6 @@ static u32 spl2sw_init_netdev(struct platform_device *pdev, u8 *mac_addr,
> >         if (ret) {
> >                 dev_err(&pdev->dev, "Failed to register net device \"%s\"!\n",
> >                         ndev->name);
> 
> If the following leads to a double free, how the previous use of
> ndev->name would actually work ?

The second free_netdev happens when device managed resources are released.
ndev->name above is used before the first free_netdev.

-- 
Ueimor