linux-kernel - Re: [PATCH v9 1/1] PRUSS UIO driver support

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Message-Id: <201103081424.01476.arnd@arndb.de>
Date:	Tue, 8 Mar 2011 14:24:00 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"TK, Pratheesh Gangadhar" <pratheesh@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hjk@...sjkoch.de" <hjk@...sjkoch.de>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"sshtylyov@...sta.com" <sshtylyov@...sta.com>,
	"Chatterjee, Amit" <amit.chatterjee@...com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 1/1] PRUSS UIO driver support

On Tuesday 08 March 2011, Thomas Gleixner wrote:
> > 
> > +static irqreturn_t pruss_handler(int irq, struct uio_info *info) {
> > +     struct pruss_priv *priv = info->priv;
> > +     struct uio_pruss_dev *gdev = priv->pupdev;
> > 
> > Note that info is a pointer to array supporting 8 interrupts. This allows to
> > redirect to driver structure via info->priv quickly.
> 
> struct uio_pruss_dev *dev = container_of(info, struct uio_pruss_dev, info);
> 
> Perhaps ?

That would require having the same number of uio_info structs as uio_pruss_dev
instances. Right now, one platform device has one uio_pruss_dev instance, which
has 8 uio_info instances, so the container_of() trick doesn't work.

	Arnd
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