Re: [RFC patch] genirq threading (v2) for ehci, ohci and uhci USBhosts and ohci1394

From: Sven-Thorsten Dietrich
Date: Tue Oct 21 2008 - 06:29:43 EST

On Tue, 2008-10-21 at 11:37 +0930, Jonathan Woithe wrote:
> Hi
> > > This patch series implements support for threaded irq handlers for the
> > > generic IRQ layer.
> >
> > Subject: genirq threading for ehci, ohci and uhci USB hosts.
> >
> > This is a functional POC for partitioning of the USB interrupt handlers into
> > a quickcheck function and a threaded main-handler function.
> > :
> > The ieee1394/ohci1394.c is a bit more problematic, since it does not use
> > struct usb_hcd, and therefore another place for the status cache must be found,
> > in struct ti_ohci presumably.
> > I will send a separate patch for ieee1394/ohci1394.c after looking at it more.
> Thanks for sending this through; I will endeavour to test it over the coming
> days. I'll also see if I can test it for the case where USB and ieee1394
> share IRQs. Even though ieee1394 isn't done yet these changes should
> prevent the USB-related problems we've seen in FFADO when USB shares the
> firewire IRQ.
> Having said that, the forthcoming ohci1394.c patch will also be interesting
> since that is the other area which will greatly benefit FFADO.


I have re-released the patch set with support for ohci1394.

I have not tested, for lack of hardware :: it compiles.

The location of status_cache is now within the ti_ohci struct.

That organization not entirely consistent with the USB side, predicated
by other variation between the drivers.

The updated patch queue is available here.

Bug fix:
The declaration of status_cache has been made consistent u32.
The former declaration of unsigned short (copied from uhci-hcd.c) it was
probably too ambiguous for some architectures.



> Regards
> jonathan

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