linux-kernel - Re: [PATCH 05/11] net: core: provide devm_register

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Message-ID: <CAMRc=Mf0ipaeLKhHCZaq2YeZKzi=QBAse7bEz2hHxXN5OL=ptg@mail.gmail.com>
Date:   Wed, 6 May 2020 08:39:47 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Felix Fietkau <nbd@...nwrt.org>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Arnd Bergmann <arnd@...db.de>,
        Fabien Parent <fparent@...libre.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 05/11] net: core: provide devm_register_netdev()

wt., 5 maj 2020 o 19:31 Jakub Kicinski <kuba@...nel.org> napisał(a):
>
> On Tue,  5 May 2020 16:02:25 +0200 Bartosz Golaszewski wrote:
> > From: Bartosz Golaszewski <bgolaszewski@...libre.com>
> >
> > Provide devm_register_netdev() - a device resource managed variant
> > of register_netdev(). This new helper will only work for net_device
> > structs that have a parent device assigned and are devres managed too.
> >
> > Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
>
> > diff --git a/net/core/dev.c b/net/core/dev.c
> > index 522288177bbd..99db537c9468 100644
> > --- a/net/core/dev.c
> > +++ b/net/core/dev.c
> > @@ -9519,6 +9519,54 @@ int register_netdev(struct net_device *dev)
> >  }
> >  EXPORT_SYMBOL(register_netdev);
> >
> > +struct netdevice_devres {
> > +     struct net_device *ndev;
> > +};
>
> Is there really a need to define a structure if we only need a pointer?
>

There is no need for that, but it really is more readable this way.
Also: using a pointer directly doesn't save us any memory nor code
here.

Bart