> From: Greg Kroah-Hartman
> CONFIG_USB_DEBUG is going away, so remove the few places in the USB core
> that relied on them.
>
> This means that we always now do the "debug" checks for every urb
> submitted, which is a good idea, as who knows how many driver bugs we
> have been ignoring when people forget to enable this option. Also, with
> the overall speed of USB, doing these extra checks should not cause any
> additional overhead.
Well USB3 isn't that slow, and the new version coming along soon is
even faster.
Running gigabit ethernet on usb3 shows a significantly higher cpu
cost than when using a normal ethernet adapter - and really the actual
operations required are very similar.
...
> /* Check that the pipe's type matches the endpoint's type */
> if (usb_pipetype(urb->pipe) != pipetypes[xfertype])
It looks as though it ought to be possible to make that check:
if (unlikely(xfertype != urb->pipe->valid_xfertype))
David
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