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

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Message-ID: <20080702100927.GB5342@digi.com>
Date:	Wed, 2 Jul 2008 12:09:28 +0200
From:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] handle failure of irqchip->set_type in setup_irq

Hello Andrew,

Andrew Morton wrote:
> On Wed, 2 Jul 2008 11:17:57 +0200 Uwe Kleine-K__nig <Uwe.Kleine-Koenig@...i.com> wrote:
> 
> > Hello,
> >
> > [extending the Cc: list]
> >
> > Uwe Kleine-K__nig wrote:
> > > set_type returns an int but currently setup_irq ignores that.
> > >
> > > To save me from undoing some changes setting the IRQ_NO_BALANCING bit in
> > > desc->flags, setting IRQ_PER_CPU in desc->status and adding the new
> > > action to desc is only done after set_type succeeded.
> > >
> > > Signed-off-by: Uwe Kleine-K__nig <Uwe.Kleine-Koenig@...i.com>
> > > ---
> > > Hello,
> > >
> > > in my case set_type returns an error because gpio-key tries to use
> > > IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING and my irq-chip can only do
> > > one of these.
> >
> > up to now I didn't get any response for this patch.  It addresses a real
> > problem for my platform so I really like to have a fix in.
> >
> > In mmotm of 2008-07-01-21-57 kernel/irq/manage.c is touched[1],
> > too, but git was able to automerge the change correctly when applying it
> > on top of mmotm.
> >
> > For your convenience you can find the patch again at the end of this
> > mail.
> >
> > Andrew:  Do you can take this patch into mm?
> >
> 
> >From a brief squint the patch seems to be reasonable.  But the
> changelog is a bit mangled.  Perhaps you could have another go when
> resending it.  Explan more clearly under what circumststances your
> ->set_type() implementation can fail and why you require the core code
> to handle this.
OK.

> Perhaps we want a dump_stack() on the error path so we can see who
> goofed.  Or a print_symbol() of desc->chip->set_type.  Or perhaps not.
I thought about a dump_stack() but considered it as too much.
print_symbol() is a nice idea though.
 
> Did you check that all the current ->set_type() implementations are
> returning zero?
No, I don't.  But for example orion5x_gpio_set_irq_type might return
-EINVAL.  txx9_irq_set_type seems to have the same limitation as ns9xxx
and returns -EINVAL if more than one trigger type is requested.

Best regards
Uwe

-- 
Uwe Kleine-König, Software Engineer
Digi International GmbH Branch Breisach, Küferstrasse 8, 79206 Breisach, Germany
Tax: 315/5781/0242 / VAT: DE153662976 / Reg. Amtsgericht Dortmund HRB 13962
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