q: a trivial question of usb2_transfer_unsetup()

[Hans Petter Selasky]

On Friday 27 March 2009, Weongyo Jeong wrote:
> Hello Hans,
>
> I have a simple question that is there a possibility for .mh.callback of
> usb2_config to be called after usb2_transfer_unsetup()?

Hi,

usb2_transfer_unsetup() calls usb2_transfer_drain() which ensures that the 
callback has exited before returning. Even if you drop the private transfer 
lock in the callback and pick it up before returning.

--HPS