hv_sock: Add the support of hibernation

Add the necessary dummy callbacks for hibernation.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c
index c443db7..cd4a364 100644 (file)
--- a/net/vmw_vsock/hyperv_transport.c
+++ b/net/vmw_vsock/hyperv_transport.c
@@ -938,6 +938,24 @@ static int hvs_remove(struct hv_device *hdev)
        return 0;
 }
 
+/* hv_sock connections can not persist across hibernation, and all the hv_sock
+ * channels are forced to be rescinded before hibernation: see
+ * vmbus_bus_suspend(). Here the dummy hvs_suspend() and hvs_resume()
+ * are only needed because hibernation requires that every vmbus device's
+ * driver should have a .suspend and .resume callback: see vmbus_suspend().
+ */
+static int hvs_suspend(struct hv_device *hv_dev)
+{
+       /* Dummy */
+       return 0;
+}
+
+static int hvs_resume(struct hv_device *dev)
+{
+       /* Dummy */
+       return 0;
+}
+
 /* This isn't really used. See vmbus_match() and vmbus_probe() */
 static const struct hv_vmbus_device_id id_table[] = {
        {},
@@ -949,6 +967,8 @@ static struct hv_driver hvs_drv = {
        .id_table       = id_table,
        .probe          = hvs_probe,
        .remove         = hvs_remove,
+       .suspend        = hvs_suspend,
+       .resume         = hvs_resume,
 };
 
 static int __init hvs_init(void)