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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