Re: [linux-usb-devel] Re: [BK PATCH] USB update for 2.6.3

[David Brownell]

Deepak Saxena wrote:
> On Feb 20 2004, at 18:47, Benjamin Herrenschmidt was caught saying:
>
> > > If you mean the USB target device itself, can't you walk the
> > > tree until you find a device that is no longer on bus_type
> > > usb to determine your root?
> >
> > I don't feel like walking the tree on each pci_dma access

Why should that be needed though?


> I never said it would be pretty. :)

Well, usb_device->bus->controller is the only access that
should be needed ... much prettier than a tree walk!  It's
set up as part of device enumeration.

Some of the usb_buffer_*() mapping calls could probably
start to get inlined now, using the generic DMA calls.

- Dave

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