linux-kernel - Re: [PATCH] genirq: error reporting for non-percpu interrupt in request_percpu

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Message-ID: <20131018103117.GA3296@mudshark.cambridge.arm.com>
Date:	Fri, 18 Oct 2013 11:31:18 +0100
From:	Will Deacon <will.deacon@....com>
To:	Vinayak Kale <vkale@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH] genirq: error reporting for non-percpu interrupt in
 request_percpu_irq()

On Fri, Oct 18, 2013 at 11:06:29AM +0100, Vinayak Kale wrote:
> Return a separate error code when a non-percpu interrupt is passed to
> request_percpu_irq().
> 
> Suggested-by: Will Deacon <will.deacon@....com>
> Signed-off-by: Vinayak Kale <vkale@....com>
> ---
>  kernel/irq/manage.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index 514bcfd..c2713ae 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -1671,10 +1671,12 @@ int request_percpu_irq(unsigned int irq, irq_handler_t handler,
>  		return -EINVAL;
>  
>  	desc = irq_to_desc(irq);
> -	if (!desc || !irq_settings_can_request(desc) ||
> -	    !irq_settings_is_per_cpu_devid(desc))
> +	if (!desc || !irq_settings_can_request(desc))
>  		return -EINVAL;
>  
> +	if (!irq_settings_is_per_cpu_devid(desc))
> +		return -EPERM;

<bikeshedding> I reckon -ENODEV is clearer here. </bikeshedding>

Also, there's a counterpart to this code in request_threaded_irq, where I
think we should do something similar.

Will
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