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From: "Gabriel L. Somlo" <gsomlo@gmail.com>
To: Joel Stanley <joel@jms.id.au>
Cc: Florent Kermarrec <florent@enjoy-digital.fr>,
	"David S . Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	Karol Gugala <kgugala@antmicro.com>,
	Mateusz Holenko <mholenko@antmicro.com>,
	devicetree <devicetree@vger.kernel.org>,
	Networking <netdev@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	David Shah <dave@ds0.me>, Stafford Horne <shorne@gmail.com>
Subject: Re: [PATCH v2 2/2] net: Add driver for LiteX's LiteEth network interface
Date: Wed, 25 Aug 2021 08:00:06 -0400	[thread overview]
Message-ID: <YSYwxmCqDKL+qvY/@errol.ini.cmu.edu> (raw)
In-Reply-To: <CACPK8Xf9LGQBUHmS9sQ4zG1akk5SoQ-31MD-GMWVSRuByAT7KQ@mail.gmail.com>

On Wed, Aug 25, 2021 at 06:35:17AM +0000, Joel Stanley wrote:
> > > +
> > > +     netdev = devm_alloc_etherdev(&pdev->dev, sizeof(*priv));
> > > +     if (!netdev)
> > > +             return -ENOMEM;
> > > +
> > > +     SET_NETDEV_DEV(netdev, &pdev->dev);
> > > +     platform_set_drvdata(pdev, netdev);
> > > +
> > > +     priv = netdev_priv(netdev);
> > > +     priv->netdev = netdev;
> > > +     priv->dev = &pdev->dev;
> > > +
> > > +     irq = platform_get_irq(pdev, 0);
> > > +     if (irq < 0) {
> > > +             dev_err(&pdev->dev, "Failed to get IRQ %d\n", irq);
> > > +             return irq;
> >
> > At this point, netdev has been dynamically allocated, and should
> > probably be free'd before liteeth_probe() is allowed to fail,
> > to avoid any potential leaks...
> 
> We use the managed variant of alloc_etherdev, which means the
> structure is freed by the driver core when the driver is removed. This
> saves having to open code the cleanup/free code.
> 
> Have a read of Documentation/driver-api/driver-model/devres.rst for
> more information.

That makes sense, thanks for the link!

Cheers,
--Gabriel

  parent reply	other threads:[~2021-08-25 12:00 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20  7:47 [PATCH v2 0/2] net: Add LiteETH network driver Joel Stanley
2021-08-20  7:47 ` [PATCH v2 1/2] dt-bindings: net: Add bindings for LiteETH Joel Stanley
2021-08-20 17:41   ` Andrew Lunn
2021-08-23 18:44   ` Rob Herring
2021-08-24  3:51     ` Joel Stanley
2021-08-24 11:52       ` Rob Herring
2021-08-25  3:00         ` Joel Stanley
2021-08-20  7:47 ` [PATCH v2 2/2] net: Add driver for LiteX's LiteEth network interface Joel Stanley
2021-08-20 11:50   ` kernel test robot
2021-08-24 19:43   ` Gabriel L. Somlo
2021-08-25  6:35     ` Joel Stanley
2021-08-25  6:41       ` Joel Stanley
2021-08-25 12:00       ` Gabriel L. Somlo [this message]
2021-08-27  2:11       ` Andrew Lunn

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