D8570.id22321.diff
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	Index: sys/dev/hyperv/vmbus/vmbus_chan.c
	===================================================================
	--- sys/dev/hyperv/vmbus/vmbus_chan.c
	+++ sys/dev/hyperv/vmbus/vmbus_chan.c
	@@ -814,8 +814,22 @@
	/*
	* Disconnect the TX+RX bufrings from this channel.
	*/
	- if (chan->ch_bufring_gpadl) {
	- vmbus_chan_gpadl_disconnect(chan, chan->ch_bufring_gpadl);
	+ if (chan->ch_bufring_gpadl != 0) {
	+ int error1;
	+
	+ error1 = vmbus_chan_gpadl_disconnect(chan,
	+ chan->ch_bufring_gpadl);
	+ if (error1) {
	+ /*
	+ * XXX
	+ * The bufring GPADL is still connected; abandon
	+ * this bufring, instead of having mysterious
	+ * crash or trashed data later on.
	+ */
	+ vmbus_chan_printf(chan, "chan%u bufring GPADL "
	+ "is still connected after close\n", chan->ch_id);
	+ chan->ch_bufring = NULL;
	+ }
	chan->ch_bufring_gpadl = 0;
	}