Re: [PATCH 2/4] i2c-i801: Fallback to polling if request_irq() fails

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

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On Mon, Nov 10, 2014 at 10:31:04PM +0100, Jean Delvare wrote:
> The i2c-i801 driver can work without interrupts, so there is no reason
> to make a request_irq failure fatal. Instead we can simply fallback
> to polling.
> 
> Signed-off-by: Jean Delvare <jdelvare-l3A5Bk7waGM@public.gmane.org>
> Cc: Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>
> ---
>  drivers/i2c/busses/i2c-i801.c |    7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> --- linux-3.18-rc4.orig/drivers/i2c/busses/i2c-i801.c	2014-11-10 22:29:42.788955868 +0100
> +++ linux-3.18-rc4/drivers/i2c/busses/i2c-i801.c	2014-11-10 22:29:44.416991298 +0100
> @@ -1242,9 +1242,11 @@ static int i801_probe(struct pci_dev *de
>  		if (err) {
>  			dev_err(&dev->dev, "Failed to allocate irq %d: %d\n",
>  				dev->irq, err);
> -			goto exit_release;
> +			priv->features &= ~FEATURE_IRQ;
> +			dev_info(&dev->dev, "SMBus using polling\n");

Shouldn't this message also be printed for !FEATURE_IRQ? I'd think it
should be moved to another place. We can also deduce from the dev_err
above that polling will be used, no?

> +		} else {
> +			dev_info(&dev->dev, "SMBus using PCI interrupt\n");
>  		}
> -		dev_info(&dev->dev, "SMBus using PCI Interrupt\n");
>  	}
>  
>  	/* set up the sysfs linkage to our parent device */
> @@ -1272,7 +1274,6 @@ static int i801_probe(struct pci_dev *de
>  exit_free_irq:
>  	if (priv->features & FEATURE_IRQ)
>  		free_irq(dev->irq, priv);
> -exit_release:
>  	pci_release_region(dev, SMBBAR);
>  exit:
>  	kfree(priv);
> 
> -- 
> Jean Delvare
> SUSE L3 Support

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