K 10 svn:author V 6 royger K 8 svn:date V 27 2016-07-29T16:33:45.799017Z K 7 svn:log V 667 xen-netfront: fix trying to send packets with disconnected netfront In certain circumstances xn_txq_mq_start might be called with num_queues == 0 during the resume phase after a migration, which can trigger a KASSERT. Fix this by making sure the carrier is on before trying to transmit, or else return that the queues are full. Just as a note, I haven't been able to reproduce this crash on my test systems, but I still think it's possible and worth fixing. Reported by: Karl Pielorz Sponsored by: Citrix Systems R&D MFC after: 5 days Reviewed by: Wei Liu Differential revision: https://reviews.freebsd.org/D7349 END