linux-kernel - Re: [PATCH v2 1/2] i2c: i2c-ocores: Add irq support for sparc

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Message-ID: <20121113163112.GA20739@pengutronix.de>
Date:	Tue, 13 Nov 2012 17:31:12 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	Andreas Larsson <andreas@...sler.com>,
	Ben Dooks <ben-linux@...ff.org>,
	Peter Korsgaard <jacmet@...site.dk>, linux-i2c@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	software@...sler.com
Subject: Re: [PATCH v2 1/2] i2c: i2c-ocores: Add irq support for sparc

Hi,

> >> @@ -275,8 +276,8 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
> >>  	if (!res)
> >>  		return -ENODEV;
> >>  
> >> -	res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> >> -	if (!res2)
> >> +	irq = platform_get_irq(pdev, 0);
> >> +	if (irq < 0)
> >>  		return -ENODEV;
> > 
> > Why not pass the error code you got?
> 
> I believe that should actually be a check for 'irq <= 0' as it returns
> NO_IRQ on error.

I wish it did, but (from 3.7-rc5):

  79 /**
  80  * platform_get_irq - get an IRQ for a device
  81  * @dev: platform device
  82  * @num: IRQ number index
  83  */
  84 int platform_get_irq(struct platform_device *dev, unsigned int num)
  85 {
  86 #ifdef CONFIG_SPARC
  87         /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
  88         if (!dev || num >= dev->archdata.num_irqs)
  89                 return -ENXIO;
  90         return dev->archdata.irqs[num];
  91 #else
  92         struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
  93 
  94         return r ? r->start : -ENXIO;
  95 #endif
  96 }
  97 EXPORT_SYMBOL_GPL(platform_get_irq);

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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