linux-kernel - Re: [PATCH] firewire: Fix ohci free

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Message-ID: <CANK3SE2nsxLMUyANzsov4d86ow4v9NuzaZsS3XvjpQJOfYXYUQ@mail.gmail.com>
Date:	Fri, 1 Feb 2013 23:00:14 +0000
From:	Mark Einon <mark.einon@...il.com>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux1394-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH] firewire: Fix ohci free_irq() warning

On 1 February 2013 21:09, Peter Hurley <peter@...leysoftware.com> wrote:
> Hi Mark,
>
> I think what Alan means is that the suspend/resume code should just
> mask/unmask interrupts at the OHCI controller, via the OHCI
> IntEventClear/Set registers (naturally, saving the current mask and
> restoring it on resume).
>
> Of course, there's a lot more to do with an OHCI controller -- as you
> note. Like stopping running DMA contexts :)  And restarting them on
> resume.
>
> I'd do it, but I'm buried to my eyeballs in tty right now -- not fun. I
> can _eventually_ do this as I need to address problems with the FW643
> anyway at some point, but it's going to be a little while.

Hi Peter,

Ok, understood. I can certainly attempt a patch if I get time.

>
> In the meantime, I'm a little confused: you say you can't test this code
> because you have no hardware; but then how'd you trip this bug?

I can test the code in that I have a firewire port on my laptop, but
haven't got anything to plug into the port.
I assume that any large changes I make are quite capable of breaking
something there...

Cheers,

Mark
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