linux-kernel - Re: [PATCH] genirq: irq_chip->startup() usage in setup_irq and set_irq

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Date:	Sun, 24 Aug 2008 08:43:15 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pawel MOLL <pawel.moll@...com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] genirq: irq_chip->startup() usage in setup_irq and
	set_irq_chained handler

On Sat, 2008-08-23 at 18:08 +0200, Ingo Molnar wrote:
> > Apparently I have swapped To: and Cc: field in the original mail,
> > apologies.
> > 
> > > This patch clarifies a usage of irq_chip->startup() callback:
> > > 
> > > 1. The "if (startup) startup(); else enabled();" code in setup_irq()
> > >    is unnecessary, as startup() falls back to enabled() via
> > >    default callbacks, set by irq_chip_set_defaults().
> > > 
> > > 2. When using set_irq_chained_handler() the startup() was never called,
> > >    which is not good at all... Fixed. And again - when startup() is not
> > >    defined the call will fall back to enable() than to unmask() via
> > >    default callbacks.
> > 
> > Any comment on the patch?
> 
> looks good to me at first glance - but i Cc:-ed Thomas and Ben, maybe 
> they have further comments.

The second change is a significant semantic change. I wouldn't be
surprised if I have cases that rely (or work around) the lack of
startup() in set_irq_chained_handler(). I'll have to dbl check things
next week. Can you send me a copy of those patches ?

Cheers,
Ben.


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