linux-kernel - Re: [PATCH] pci: do not try to assign irq 255

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Date:	Tue, 5 Mar 2013 14:41:50 -0800
From:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
To:	Hannes Reinecke <hare@...e.de>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>, linux-kernel@...r.kernel.org,
	Frederik Himpe <fhimpe@....ac.be>,
	Oliver Neukum <oneukum@...e.de>,
	David Haerdeman <david@...deman.nu>, linux-usb@...r.kernel.org,
	linux-pci@...r.kernel.org, Andy Grover <agrover@...hat.com>
Subject: Re: [PATCH] pci: do not try to assign irq 255

On Fri, Mar 01, 2013 at 08:41:13AM +0100, Hannes Reinecke wrote:
> On 02/27/2013 10:13 PM, Bjorn Helgaas wrote:
> >[+cc Andy]
> >
> >3) I don't understand why the xhci init fails in the first place.  It
> >looks like the "request interrupt 255 failed" message is from
> >xhci_try_enable_msi(), but that function tries to enable MSI-X, then
> >MSI, then falls back to legacy interrupts, where we get the error.
> >But the device supports MSI, so I don't know why we even fall back to
> >trying legacy interrupts.  Hannes, do you have any insight into that?
> >Obviously I'm missing something here.
> >
> Hehe. Due to overly clever design.
> xhci actually sets up interrupts _twice_, once per request_irq() in
> the generic code and a second time during xhci_run.
> But as the first call fails it'll never ever run the second part.
> 
> I'll be sending a patch.

Something like this?

http://marc.info/?l=linux-usb&m=132972894117916&w=2

(Apparently we had this issue around the same time last year, but we
thought the BIOS bug had been resolved.)

Sarah Sharp
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