linux-kernel - [BUG][RFC][GENERIC IRQ] linux-2.6.24 (delayed) disable IRQ feature not functional for handle_simple

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Date:	Tue, 19 Feb 2008 10:25:13 -0000
From:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
To:	"Thomas Gleixner" <tglx@...utronix.de>,
	"Hennerich, Michael" <Michael.Hennerich@...log.com>
Cc:	<mingo@...e.hu>, <linux-kernel@...r.kernel.org>
Subject: [BUG][RFC][GENERIC IRQ] linux-2.6.24 (delayed) disable IRQ feature not functional for handle_simple_irq

Thomas,

I have reasonable doubt that the delayed disable feature on linux-2.6.24 for handle_simple_irq is broken.

In 2.6.22 there was something like this:

	if (unlikely(!action || (desc->status & IRQ_DISABLED))) {
		if (desc->chip->mask)
			desc->chip->mask(irq);
...

However in 2.6.24 the "DISABLED" IRQ in case it happens is never going to be masked.  

	if (unlikely(!action || (desc->status & IRQ_DISABLED)))
		goto out_unlock;


I see a disabled IRQ being invoked in an endless loop.

-Michael

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