linux-kernel - Re: [patch 2.6.18] genirq: remove oops with fasteoi irq

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Message-Id: <1159401291.9326.599.camel@localhost.localdomain>
Date:	Thu, 28 Sep 2006 01:54:51 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	David Brownell <david-b@...bell.net>
Cc:	Linux Kernel list <linux-kernel@...r.kernel.org>, mingo@...hat.com
Subject: Re: [patch 2.6.18] genirq: remove oops with fasteoi irq_chip
	descriptors

Dave,

On Wed, 2006-09-27 at 16:21 -0700, David Brownell wrote:
> As you should know, irq_chip_set_defaults() ensures that every
> irqchip has startup() and shutdown() methods.  Their default
> implementations use enable() and disable() ... which in turn
> have default implementations using mask()/unmask(), for use
> with non-EIO handlers. 

True. Still you change the semantics.

	chip->mask();
	chip->ack();

is not equal to :

	if (!(desc->status & IRQ_DELAYED_DISABLE))
		irq_desc[irq].chip->mask(irq);


> So what's the correct fix then ... use enable() and disable()?
> Oopsing isn't OK... 

True, but we can not unconditionally change the semantics. 

Does it break existing or new code ?

> It was certainly _tested_ on a 2.6.18 ARM board, so you're clearly wrong
> about at least that part of your feedback as well as the bits about the
> shartup and shutdown calls being "optional" (in any practical sense, since
> they are in fact _always_ present).

Sorry, I did not think about the defaults in the first place. The
conditionals in manage,c are probably superflous leftovers from one of
the evolvement.

	tglx


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