Drivers: hv: vmbus: Implement the protocol for tearing down vmbus state

Implement the protocol for tearing down the monitor state established with
the host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 865a3af..4b9d89a 100644 (file)
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -421,6 +421,30 @@ static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_gui
        channel->target_vp = hv_context.vp_index[cur_cpu];
 }
 
+/*
+ * vmbus_unload_response - Handler for the unload response.
+ */
+static void vmbus_unload_response(struct vmbus_channel_message_header *hdr)
+{
+       /*
+        * This is a global event; just wakeup the waiting thread.
+        * Once we successfully unload, we can cleanup the monitor state.
+        */
+       complete(&vmbus_connection.unload_event);
+}
+
+void vmbus_initiate_unload(void)
+{
+       struct vmbus_channel_message_header hdr;
+
+       init_completion(&vmbus_connection.unload_event);
+       memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));
+       hdr.msgtype = CHANNELMSG_UNLOAD;
+       vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header));
+
+       wait_for_completion(&vmbus_connection.unload_event);
+}
+
 /*
  * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
  *
@@ -717,6 +741,7 @@ struct vmbus_channel_message_table_entry
        {CHANNELMSG_INITIATE_CONTACT,           0, NULL},
        {CHANNELMSG_VERSION_RESPONSE,           1, vmbus_onversion_response},
        {CHANNELMSG_UNLOAD,                     0, NULL},
+       {CHANNELMSG_UNLOAD_RESPONSE,            1, vmbus_unload_response},
 };
 
 /*

diff --cc drivers/hv/connection.c
Simple merge

diff --cc drivers/hv/hyperv_vmbus.h
Simple merge

diff --cc drivers/hv/vmbus_drv.c
Simple merge

diff --cc include/linux/hyperv.h
Simple merge