Re: [linux-usb-devel] Bulk URB submission.

[David Brownell]

I think I've got the answers to my questions now, and
DaveM provided some info for DMA-mapping.txt
to help make sure other folk get them too.

For USB device drivers:

- Buffers in URBs don't need to be aligned.  This is
  for data transfer buffers, also control setup packets.

- However the data buffers need to be allocated
  using __get_free_pages() or something using it
  (kmalloc, kmem_cache, skb_alloc, ...).

USB device drivers never see the additional
issues that USB Host Controller Drivers need
to deal with for QH/ED/TD data structures.

- Dave



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