Re: [linux-usb-devel] URB with scatter-gather?

[David Brownell]

> > > Not really, since for lots of devices, short packets mean something
> > > special if we send one.
> 
> > I think you were assuming something different about s/g semantics
> > than I was, then.  If the driver chooses to put a short packet into
> > an s/g list, I expected it did so to get that special effect.  Perhaps
> > you were thinking it was expecting the HCD to coalesce some
> > buffers?  How about just returning EINVAL?  :)
>
> I think he means short packet in, not short packet out.

Except he said "send" ... ;)

For "in", why shouldn't a short packet terminate the whole series
of transfers?  Underrun, overrun ... in both cases, the device and
driver are significantly out-of-sync.






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