netdev - Re: [PATCH net-next 1/2] net: create device lookup API with reference tracking

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Date: Fri, 9 Jun 2023 12:16:10 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, netdev@...r.kernel.org, pabeni@...hat.com,
 dsahern@...il.com
Subject: Re: [PATCH net-next 1/2] net: create device lookup API with
 reference tracking

On Fri, 9 Jun 2023 20:50:07 +0200 Eric Dumazet wrote:
> > -               dev = dev_get_by_index(net, ifindex);
> > +               dev = netdev_get_by_index(net, ifindex, &req_info->dev_tracker,
> > +                                         GFP_KERNEL);
> >                 if (!dev) {
> >                         NL_SET_ERR_MSG_ATTR(extack,
> >                                             tb[ETHTOOL_A_HEADER_DEV_INDEX],  
> 
> You forgot to change dev_put(dev) at line 126

Oh, good catch!

> Oh well, this would need GFP_ATOMIC, I guess this might be the reason
> you kept netdev_tracker_alloc()
> that can run after rcu_read_unlock()

Yes :(