linux-kernel - Re: [PATCH] ata: Don't use NO_IRQ in pata_of

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Date:	Fri, 2 Dec 2011 14:40:37 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Dave Martin <dave.martin@...aro.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	devicetree-discuss@...ts.ozlabs.org,
	LKML <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	linux-next@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: Re: [PATCH] ata: Don't use NO_IRQ in pata_of_platform driver

On Fri, Dec 2, 2011 at 2:34 PM, Anton Vorontsov
<anton.vorontsov@...aro.org> wrote:
>
> One option is to test this patch on a board that is now broken:
>
> http://lkml.org/lkml/2011/11/10/290

That seems broken.

Spot the trouble:

  +	ret = irq_create_of_mapping(oirq.controller, oirq.specifier,
  +				    oirq.size);
  +no_irq:
  +#ifdef NO_IRQ
  +#if NO_IRQ != 0
  +	if (ret == NO_IRQ)
  +		pr_warn("Hit NO_IRQ case for your arch. Drivers might expect "
  +			"NO_IRQ, but we return 0. If anything breaks, driver "
  +			"have to be fixed.\n");
  +#endif
  +#endif
  +	return ret;

It claims "we return 0", but then doesn't return zero.. Hmm?

                  Linus
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