linux-kernel - Re: [patch] ohci1394: don't leave interrupts enabled during suspend/resume

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Date:	Sat, 06 Dec 2008 17:12:26 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Frans Pop <elendil@...net.nl>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux1394-devel@...ts.sourceforge.net,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [patch] ohci1394: don't leave interrupts enabled during suspend/resume

Frans Pop wrote:
> On my HP 2510p I get the following in dmesg during near the end of most
> resumes from suspend to RAM:
> 
> irq 19: nobody cared (try booting with the "irqpoll" option)
> Pid: 0, comm: swapper Not tainted 2.6.28-rc7 #67
> Call Trace:
>  <IRQ>  [<ffffffffa00ee9e1>] ? ohci_irq_handler+0x60/0x7e9 [ohci1394]
...
> There also seems to be an interrupt storm during suspend/resume when this
> happens:
>  19:      99968         33   IO-APIC-fasteoi   ohci1394
> 
> This patch gets rid of both issues and makes the resume as a whole
> significantly faster.

Looks good, thanks.  Committed to linux1394-2.6.git.

...
> I don't actually use firewire, so I cannot test anything other than
> checking dmesg and seeing that there are no changes. With the patch
> I do see a very slow increase of the interrupt count, so the device
> seems active.

Yes, there should be an interrupt every 64 seconds even if no IO is
going through the FireWire controller.

> Please review the patch carefully, especially the error handling.
> The patch is essentially only copy-and-paste work, with checks against
> other drivers and the ohci1394_pci_probe function.

Error handling in ohci1394's suspend method looked dubious already
before your patch...
-- 
Stefan Richter
-=====-==--- ==-- --==-
http://arcgraph.de/sr/
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