linux-kernel - Re: [ 57/72] genirq: Unmask oneshot irqs when thread was not woken

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Date:	Tue, 6 Mar 2012 20:31:46 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Stefan Lippers-Hollmann <s.L-H@....de>,
	Sven Joachim <svenjoac@....de>,
	Greg KH <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>, stable@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jonathan Nieder <jrnieder@...il.com>,
	linux-wireless@...r.kernel.org,
	Stefano Brivio <stefano.brivio@...imi.it>
Subject: Re: [ 57/72] genirq: Unmask oneshot irqs when thread was not woken

On Tue, 6 Mar 2012, Thomas Gleixner wrote:
> On Tue, 6 Mar 2012, Thomas Gleixner wrote:
> 
> > On Mon, 5 Mar 2012, Linus Torvalds wrote:
> > 
> > > Thomas, should we just plan on reverting that commit from mainline? It
> > > clearly causes regressions.
> > 
> > Give me a day or two to figure out why it breaks stuff. I have no idea
> > why it should wreckage anything.
> 
> Hmm. This is interesting. The b43 driver has a primary handler which
> can return IRQ_NONE. So up to that change the interrupt line was kept
> disabled when that happened. Possibly the driver relies on that
> behaviour. Digging for a machine with a b43.

Does not reproduce. Now I was looking at the driver again, it does not
use IRQ_ONESHOT anyway.

So for handle_fasteoi_irq() this patch is actually a NOOP. So the only
affected handler would be handle_level_irq(). Still can't see how it
changes the !IRQ_ONESHOT behaviour :(

Stephan, Sven: Can you please provide the output of /proc/interrupts ?

Thanks,

	tglx



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