Re: [linux-usb-devel] FIXME in devio.c::proc_ioctl()

[David Brownell]

Alan Stern wrote:

	I believe, as a result of a somewhat hasty
perusal of the USB spec, that it is legal under some circumstances for a
device to fail to reply at all to a USB transaction for an extended period
of time.  For instance, if several isochronous OUT transfers in a row get
corrupted, the device is not obliged to transmit a handshake or any other
kind of reply.  Unless the HCD includes some provision for timing out a
TD/ED, it would not notice anything wrong.

Actually in that case your "just wait for urb completion" model would
eventually work, since the ISO transfers are all "fire and forget".
There are no retries for ISO.

- Dave




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