netdev - Re: [PATCH net-next v2 6/6] net: marvell: prestera: Implement initial inetaddr notifiers

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Date:   Thu, 6 Jan 2022 06:31:06 +0200
From:   Yevhen Orlov <yevhen.orlov@...ision.eu>
To:     Ido Schimmel <idosch@...sch.org>
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org, andrew@...n.ch,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Mickey Rachamim <mickeyr@...vell.com>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Taras Chornyi <tchornyi@...vell.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2 6/6] net: marvell: prestera: Implement
 initial inetaddr notifiers

On Thu, Dec 30, 2021 at 04:39:23PM +0200, Ido Schimmel wrote:
> > +			return -EEXIST;
> > +		}
> > +		re = prestera_rif_entry_create(port->sw, &re_key,
> > +					       prestera_fix_tb_id(kern_tb_id),
> > +					       port_dev->dev_addr);
> > +		if (!re) {
> > +			NL_SET_ERR_MSG_MOD(extack, "Can't create rif_entry");
> > +			return -EINVAL;
> > +		}
> > +		dev_hold(port_dev);
>
> What is the purpose of this dev_hold()?
>

To make sure the port_dev is not freed before rif destroyed.