> > It's worth to note that a number of drivers under usb/media/
> > still implement "simple" urb removal (urb_unlink()+free_urb())
> > without the above mechanism and proper error handling.
> > Although this is not a problem in most of the cases, it is likely
> > that they crash the kernel on SMP machines.
>
> usb_unlink_urb() followed immediately by usb_free_urb() is correct, even
> if the unlink is asynchronous. Reference counting of URBs guarantees that
> the URB won't be deallocated until the completion handler has finished
> running and the URB is idle.
Unless you consider module unload.
Regards
Oliver
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