[PATCH] of/i2c: don't pass -1 to irq_dispose_mapping, otherwise kernel will oops

[Grant Likely]

On Fri, Jul 11, 2008 at 09:48:59PM +0400, Anton Vorontsov wrote:
> Firstly kernel warns at set_irq_chip, and then dies completely:
> 
> Trying to install chip for IRQ-1
>
> diff --git a/drivers/of/of_i2c.c b/drivers/of/of_i2c.c
> index b2ccdcb..95a24de 100644
> --- a/drivers/of/of_i2c.c
> +++ b/drivers/of/of_i2c.c
> @@ -93,10 +93,8 @@ void of_register_i2c_devices(struct i2c_adapter *adap,
>  		if (info.irq == NO_IRQ)
>  			info.irq = -1;

What is the reason that info.irq is set to -1 in the first place?  This
looks like another bug to me.  Does something in the i2c layer depend on
the -1 value?

g.