linux-kernel - Re: [PATCH] pcmcia: irq probe can be done without risking an IRQ storm

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Message-Id: <1177608704.25960.21.camel@localhost.localdomain>
Date:	Thu, 26 Apr 2007 19:31:44 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pcmcia: irq probe can be done without risking an IRQ
	storm

On Wed, 2007-04-25 at 21:18 -0700, Andrew Morton wrote:
> On Thu, 5 Apr 2007 14:09:36 +0100 Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> > Nowdays you can ask for an IRQ to be allocated but not enabled, when
> > PCMCIA was written this was not true and this feature is thus not used
> > 
> > Signed-off-by: Alan Cox <alan@...hat.com>
> > 
> > diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c linux-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c
> > --- linux.vanilla-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c	2007-04-03 16:52:14.000000000 +0100
> > +++ linux-2.6.21-rc5-mm4/drivers/pcmcia/pcmcia_resource.c	2007-04-03 17:10:42.000000000 +0100
> > @@ -810,8 +810,11 @@
> >  		type = IRQF_SHARED;
> >  	if (req->Attributes & IRQ_TYPE_DYNAMIC_SHARING)
> >  		type = IRQF_SHARED;	
> >  #ifdef CONFIG_PCMCIA_PROBE
> > +	if (!(req->Attributes & IRQ_HANDLE_PRESENT))
> > +		type |= IRQ_NOAUTOEN;
> > +
> >  	if (s->irq.AssignedIRQ != 0) {
> >  		/* If the interrupt is already assigned, it must be the same */
> >  		irq = s->irq.AssignedIRQ;
> 
> alpha:
> 
> drivers/pcmcia/pcmcia_resource.c: In function 'pcmcia_request_irq':
> drivers/pcmcia/pcmcia_resource.c:816: error: 'IRQ_NOAUTOEN' undeclared (first use in this function)
> drivers/pcmcia/pcmcia_resource.c:816: error: (Each undeclared identifier is reported only once
> drivers/pcmcia/pcmcia_resource.c:816: error: for each function it appears in.)
> 
> Problem is, IRQ_NOAUTOEN is a generic-irq thing, so architectures which
> don't use generic-irqs break.  And it's defined in linux/irq.h which
> (stupidly) cannot be included in generic code.

Hrmpf. We need a IRQF_NOAUTOEN, which can be handed to reqeust_irq().

I cook a patch.

	tglx


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