David Brownell wrote:
On Thursday 07 October 2004 9:32 am, Feyd wrote:
Are the usb controllers s/g capable?
For some definitions of s/g, yes...
What are the definitions? s/g on pages would be enough.
If so, the usb_buffer_alloc could
use vmalloc for high order allocations.
... no, because if you read Documentation/DMA-mapping.txt
you'll see an informative "What memory is DMA-able" section
that says, among other things,
... you may _not_ use the memory/addresses returned
from vmalloc() for DMA. ...
That's a general rule for all DMA-capable drivers, not
only for USB.
Of course not directly the adress, it would require more work as
stated in next sentence in the Documentation/DMA-mapping.txt ;)
bttv does that for example.
Feyd
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