net/queue: queue packets even if sender doesn't supply a callback
Now that we disable any receiver whose queue is full, we do not require senders to handle a zero return by supplying a sent callback. This is a second step towards allowing can_receive() handlers to return true even if no buffer space is available. Signed-off-by: NMark McLoughlin <markmc@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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