1 files changed, 11 insertions, 0 deletions

diff --git a/sys/dev/hyperv/include/vmbus.h b/sys/dev/hyperv/include/vmbus.h
index 7fe93cea59bb..9671c8ee6d47 100644
--- a/sys/dev/hyperv/include/vmbus.h
+++ b/sys/dev/hyperv/include/vmbus.h
@@ -129,6 +129,17 @@ vmbus_get_channel(device_t dev)
 	return device_get_ivars(dev);
 }
 
+/*
+ * vmbus_chan_open_br()
+ * Return values:
+ * 0			Succeeded.
+ * EISCONN		Failed, and the memory passed through 'br' is still
+ *			connected.  Callers must _not_ free the the memory
+ *			passed through 'br', if this error happens.
+ * other values		Failed.  The memory passed through 'br' is no longer
+ *			connected.  Callers are free to do anything with the
+ *			memory passed through 'br'.
+ */
 int		vmbus_chan_open(struct vmbus_channel *chan,
 		    int txbr_size, int rxbr_size, const void *udata, int udlen,
 		    vmbus_chan_callback_t cb, void *cbarg);