linux-kernel - Re: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will stall forever

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Message-ID: <Pine.LNX.4.58.0711291128540.23075@gandalf.stny.rr.com>
Date:	Thu, 29 Nov 2007 11:30:34 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Remy Bohmer <linux@...mer.net>
cc:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Walker <dwalker@...sta.com>,
	RT <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ARM Linux Mailing List 
	<linux-arm-kernel@...ts.arm.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH PREEMPT_RT]: On AT91 ARM: GPIO Interrupt handling can/will
 stall forever


On Thu, 29 Nov 2007, Remy Bohmer wrote:

> I changed the interrupt handler from the simple_irq to the edge_irq,
> and it works...!!
> (I added a noop routine for that .ack part, because there is no ack)
>
> I believe I was too focussed on the masking bug in the RT kernel on
> the simple_irq() that I did not see that for the AT91 series the edge
> type interrupt handler also works... (even better...) What I thought
> was 1 single bug in the RT-kernel turned out to be a number of things
> together that aren't correct, even for mainline.
>
> So, to come to a conclusion: The masking bug in RT is still there in
> the simple_irq path, and masking has to be removed from the simple_irq
> code. Also for mainline. AT91 can live without simple_irq.
> I think we are in sync again...
>
> I will post a patch for the AT91 later on, after some more testing.


Remy,

Thanks a lot for figuring this out!! Makes me feel better for the NACK ;-)

If you also want to send me a patch to remove the masking in the
simple_irq code, please do.

Thanks,

-- Steve

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