linux-kernel - Re: [PATCH v3 24/25] irq_domain: remove "hint" when allocating irq numbers

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Message-ID: <20120216060334.GA11758@r65073-Latitude-D630>
Date:	Wed, 15 Feb 2012 22:03:35 -0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, Milton Miller <miltonm@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linuxppc-dev@...ts.ozlabs.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 24/25] irq_domain: remove "hint" when allocating irq
 numbers

On Wed, Feb 15, 2012 at 10:32:43PM -0700, Grant Likely wrote:
...
> That's a bug then.  The implementation should work without patch 24.  Does
> this patch fix it?
> 
Yes, it fixes the problem for me.

Regards,
Shawn

> ---
> 
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index 2c1d6f8..2d3dfff 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -516,8 +516,8 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
>  		return irq_domain_legacy_revmap(domain, hwirq);
>  
>  	/* Slow path does a linear search of the map */
> -	if (hint < NUM_ISA_INTERRUPTS)
> -		hint = NUM_ISA_INTERRUPTS;
> +	if (hint == 0)
> +		hint = 1;
>  	i = hint;
>  	do {
>  		struct irq_data *data = irq_get_irq_data(i);
> @@ -525,7 +525,7 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
>  			return i;
>  		i++;
>  		if (i >= irq_virq_count)
> -			i = NUM_ISA_INTERRUPTS;
> +			i = 1
>  	} while(i != hint);
>  	return 0;
>  }
> 
--
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