linux-kernel - Re: [PATCHv3 3/3] net: velocity: Add platform device support to VIA velocity driver

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Message-ID: <20130502171951.GV14496@n2100.arm.linux.org.uk>
Date:	Thu, 2 May 2013 18:19:51 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Tony Prisk <linux@...sktech.co.nz>,
	vt8500-wm8505-linux-kernel@...glegroups.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, davem@...emloft.net
Subject: Re: [PATCHv3 3/3] net: velocity: Add platform device support to
	VIA velocity driver

On Tue, Apr 30, 2013 at 01:04:50AM +0200, Francois Romieu wrote:
> Tony Prisk <linux@...sktech.co.nz> :
> [...]
> > +static int velocity_remove(void *pdev, enum velocity_bus_type bustype)
> > +{
> > +	struct net_device *netdev;
> > +	struct velocity_info *vptr;
> > +	int pci = (bustype == BUS_PCI) ? 1 : 0;
> > +
> > +	if (pci)
> > +		netdev = pci_get_drvdata(pdev);
> > +	else
> > +		netdev = platform_get_drvdata(pdev);
> 
> The caller knows how to retrieve the net_device pointer, whence
> the struct velocity_info pointer, whence any bustype dependent
> function pointer to alleviate the "if (pci)" and CONFIG stuff.
> 
> If you are not convinced, please consider turning the void *
> into an union *.

The other thing here is that you can just pass a struct device into
these and retrieve the same driver data via:

	netdev = dev_get_drvdata(dev);

as:

static inline void *platform_get_drvdata(const struct platform_device *pdev)
{
        return dev_get_drvdata(&pdev->dev);
}

static inline void *pci_get_drvdata(struct pci_dev *pdev)
{
        return dev_get_drvdata(&pdev->dev);
}

So there's no need for void * or union nonsense.
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