netdev - Re: [PATCH net-next v4 1/2] macsec: add support for IFLA_MACSEC_OFFLOAD in macsec

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Date:   Thu, 8 Dec 2022 18:32:44 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     <ehakim@...dia.com>
Cc:     <linux-kernel@...r.kernel.org>, <raeds@...dia.com>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <sd@...asysnail.net>,
        <atenart@...nel.org>, <jiri@...nulli.us>
Subject: Re: [PATCH net-next v4 1/2] macsec: add support for
 IFLA_MACSEC_OFFLOAD in macsec_changelink

On Thu, 8 Dec 2022 13:55:16 +0200 ehakim@...dia.com wrote:
> +	dev = get_dev_from_nl(genl_info_net(info), attrs);

What prevents this dev from disappearing before...

> +	if (IS_ERR(dev))
> +		return PTR_ERR(dev);
> +	if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
> +		return -EINVAL;
> +
> +	offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
> +
> +	rtnl_lock();

... we finally take the lock?

I think you're just moving this code, but still.

> +	ret = macsec_update_offload(dev, offload);
>  
>  	rtnl_unlock();