linux-kernel - Re: Where is the interrupt going?

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Message-Id: <1196117397.23293.3.camel@morte.jpl.nasa.gov>
Date:	Mon, 26 Nov 2007 14:49:57 -0800
From:	Al Niessner <Al.Niessner@....nasa.gov>
To:	benh@...nel.crashing.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Where is the interrupt going?


Yes, as also pointed out by Arjan Van de Ven, I was missing the
pci_enable_device() call. This seems related to the deprecation of
pci_find_device (or something like that) in favor of pci_get_device.
Well, by adding the pci_enable_device it all works well.

On Sat, 2007-11-24 at 08:53 +1100, Benjamin Herrenschmidt wrote:
> On Wed, 2007-11-21 at 17:08 -0800, Al Niessner wrote:
> > 
> > p8620 = pci_get_device (APC8620_VENDOR_ID, APC8620_DEVICE_ID, p8620);
> > <... fail if p8620 is 0 ...>
> > apcsi[i].ret_val = register_chrdev (MAJOR_NUM,
> > 
> > DEVICE_NAME,
> > 
> > &apc8620_ops);
> > <... fail if ret_val < 0 ...>
> > apcsi[i].board_irq = p8620->irq;
> > status = request_irq (apcsi[i].board_irq,
> >                                       apc8620_handler,
> >                                       IRQF_DISABLED,
> >                                       DEVICE_NAME,
> >                                       (void*)&apcsi[i]);
> 
> First, that's obviously not the proper way to do a PCI driver but I
> suppose you know that :-)
> 
> Then, make sure you call pci_enable_device() at one point, don't some
> platforms perform the actual IRQ routing that late ? (And don't sample
> pdev->irq before the pci_enable_device(), sample it afterward).
> 
> Cheers,
> Ben.
> 
> 
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-- 
Al Niessner
818.354.0859

All opinions stated above are mine and do not necessarily reflect those
of JPL or NASA.

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