On Sun, 10 Jun 2007, Oliver Neukum wrote:
> Am Sonntag, 10. Juni 2007 schrieb Greg KH:
> > > Yes, it could be done that way, I think. It'll take more work than a
> > > simple search-and-replace. The trickiest part is how to unlink an URB
> > > after it has been submitted but before it has been handed to the HCD...
> >
> > We allow that today? How, multiple threads doing the submit and then
> > unlink call? That's looney. We should not worry about that until after
>
> Isn't that exactly what a resubmission in the completion handler is?
No. It may be similar in some vague sense but it's not the same thing
at all. What Greg and I are talking about is this:
CPU 0 CPU 1
----- -----
call usb_submit_urb
call usb_unlink_urb
call hcd->driver->urb_enqueue
What you're talking about is this:
CPU 0
-----
call usb_hcd_giveback_urb
call urb->complete
call usb_submit_urb
It doesn't involve multiple threads or unlinking.
Alan Stern
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