Re: [PATCH v3] gpio: Add device driver for GRGPIO cores and supportcustom accessors with gpio-generic

From: Andreas Larsson
Date: Wed Feb 13 2013 - 09:14:09 EST

On 2013-02-13 08:05, Anton Vorontsov wrote:
On Tue, Feb 12, 2013 at 08:24:33AM +0100, Andreas Larsson wrote:
+ res = platform_get_resource(ofdev, IORESOURCE_MEM, 0);
+ regs = devm_request_and_ioremap(&ofdev->dev, res);

Just wonder, is it safe to pass null res to devm_request_and_ioremap()?

Yes, and it is the preferred sequence of calls according to the documentation of devm_request_and_ioremap.

+ label = kstrdup(np->full_name, GFP_KERNEL);
+ if (label)
+ gc->label = label;

Do we need to free label? If not, having a comment would be awesome. :)
And should we print a warning for !label case?

Yes, it needs to be freed, thanks! The !label case is kind of OK as the gpio system assigns some other label if it is NULL, but I'll require it instead to make things easier.

+static int grgpio_remove(struct platform_device *ofdev)
+ dev_set_drvdata(&ofdev->dev, NULL);

Is this really needed?

I guess not.

Thanks for the feedback! I take care of the other comments as well.

Andreas Larsson

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