Re: [Qemu-devel] [PATCH 1/4] usb: split packet result into actual_length + status

[Gerd Hoffmann]

  Hi,

> This patch unfortunately is somewhat invasive, since makeing the qemu
> usb core deal with this requires changes everywhere. This patch only
> prepares the usb core for this, all the hcd / device changes are done
> in such a way that there are no functional changes.

/me likes it.

When touching this _anyway_:  How about making usb_handle_packet and
->handle_data callbacks return void (or bool for completed/async) and
expect drivers to fill the fields in USBPacket instead?  That would kill
a little annonying difference in sync/async packet handling.

Adding a usb_packet_result(packet, length, status) helper function would
probably useful too.

cheers,
  Gerd