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H A De1000.c20302e71a5b654d7b4d0d61c7384e9dd8d112971 Mon Dec 01 18:06:52 UTC 2014 Michael S. Tsirkin <mst@redhat.com> e1000: defer packets until BM enabled

Some guests seem to set BM for e1000 after
enabling RX.
If packets arrive in the window, device is wedged.
Probably works by luck on real hardware, work around
this by making can_receive depend on BM.

Tested-by: Gabriel Somlo <somlo@cmu.edu>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>