linux-kernel - Re: [PATCH v2] handle failure of irqchip->set_type in setup

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Date:	Fri, 4 Jul 2008 10:17:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc:	<linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v2] handle failure of irqchip->set_type in setup_irq

On Fri, 4 Jul 2008 12:46:34 +0200 Uwe Kleine-K__nig <Uwe.Kleine-Koenig@...i.com> wrote:

> set_type returns an int indicating success or failure, but up to now
> setup_irq ignores that.
> 
> In my case this resulted in a machine hang:
> gpio-keys requested IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, but
> arm/ns9xxx can only trigger on one direction so set_type didn't touch
> the configuration which happens do default to a level sensitiveness and
> returned -EINVAL.  setup_irq ignored that and unmasked the irq.  This
> resulted in an endless triggering of the gpio-key interrupt service
> routine which effectively killed the machine.
> 
> With this patch applied setup_irq propagates the error to the caller.
> 
> Note that before in the case 
> 
> 	chip && !chip->set_type && !chip->name
> 
> a NULL pointer was feed to printk.  This is fixed, too.
> 

hm, OK.  Do I recall there being some urgency to this?

> +	if (ret) {
> +		char buf[100];
> +
> +		snprintf(buf, sizeof(buf), KERN_ERR
> +				"setting flow type for irq %u failed (%%s)\n",
> +				irq);
> +		print_fn_descriptor_symbol(buf, chip->set_type);
> +	}

eww.  We really mucked up that interface.  I wonder if we can do better.
Let me think about that.


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