linux-kernel - Re: [PATCH v4] uio/pdrv

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Message-ID: <20110506005513.GC2790@local>
Date:	Fri, 6 May 2011 02:55:13 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	Michal Simek <monstr@...str.eu>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>,
	Wolfram Sang <w.sang@...gutronix.de>,
	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	john.williams@...alogix.com, linux-kernel@...r.kernel.org,
	arnd@...db.de
Subject: Re: [PATCH v4] uio/pdrv_genirq: Add OF support

On Thu, May 05, 2011 at 07:26:43AM +0200, Michal Simek wrote:
> Hans J. Koch wrote:
> >On Wed, May 04, 2011 at 03:21:55PM +0200, Michal Simek wrote:
> >>Hans J. Koch wrote:
> >>>On Tue, May 03, 2011 at 10:34:12PM +0200, Wolfram Sang wrote:
> >>>>On Mon, May 02, 2011 at 08:51:55AM +0200, Michal Simek wrote:
> >>>>>Adding OF binding to genirq.
> >>>>>Version string is setup to the "devicetree".
> >>>>>
> >>>>>Compatible string is not setup for now but you can add your
> >>>>>custom compatible string to uio_of_genirq_match structure.
> >>>>>
> >>>>>For example with "vendor,device" compatible string:
> >>>>>static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
> >>>>>	{ .compatible = "vendor,device", },
> >>>>>	{ /* empty for now */ },
> >>>>>};
> >>>>>
> >>>>>Signed-off-by: Michal Simek <monstr@...str.eu>
> >>>>[...]
> >>>>
> >>>>>+		/* alloc uioinfo for one device */
> >>>>>+		uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
> >>>>kfree in remove?
> >>>Oh yes. Missed that one. It should probably look like the "bad0" case in probe().
> >>Yes, freeing uioinfo in uio_pdrv_genirq_remove make sense for CONFIG_OF.
> >>
> >>Please correct me if I am wrong dev.of_node is not NULL for OF. I
> >>think yes that's why I would prefer to use this construct instead of
> >>#ifdef CONFIG_OF.
> >>
> >>	if (pdev->dev.of_node)
> >>		kfree(pdev->dev.platform_data);
> >
> >Huh? You didn't allocate platform_data, so you shouldn't free it.
> >It's uioinfo you allocated.
> 
> grrr. I am stupid!

We all are, sometimes. That's why we have a public review process so that
collective stupidity can lead to good code.

Thanks,
Hans
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