Re: [BK PATCH] USB update for 2.6.3
From: Linus Torvalds
Date: Fri Feb 20 2004 - 10:12:23 EST
On Thu, 19 Feb 2004, David S. Miller wrote:
> On Fri, 20 Feb 2004 18:10:41 +1100
> Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx> wrote:
> > Hrm... so if the USB device drivers are actually doing the dma mapping
> > themselves, it make sense for them to pass their own struct device, no ?
> That's right, at least that was the idea.
No. That would be _fundamentally_ wrong.
There's no way a USB device can do DMA in the first place. It has no DMA
controller, and no way to read/write memory except through the USB host.
So it is the host - and only the host - that matters. Anything else is a
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