staging: hv: Enable sending GARP packet after live migration

commit 7c161d0b900ea9bd9fc5ea5d3fa9916e9eb0dd88 upstream.

The hv_netvsc gets RNDIS_STATUS_MEDIA_CONNECT event after the VM
is live migrated. Adding call to netif_notify_peers() for this event
to send GARP (Gratuitous ARP) to notify network peers. Otherwise,
the VM's network connection may stop after a live migration.

This patch should also be applied to stable kernel 2.6.32 and later.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c
index 547261d2537c662da0a2a5e9eeeeab7d230fb76b..a5101e3f8050c4d4cb41345a7ab650f56d5f5ae6 100644 (file)
--- a/drivers/staging/hv/netvsc_drv.c
+++ b/drivers/staging/hv/netvsc_drv.c
@@ -296,6 +296,7 @@ static void netvsc_linkstatus_callback(struct hv_device *device_obj,
        if (status == 1) {
                netif_carrier_on(net);
                netif_wake_queue(net);
+               netif_notify_peers(net);
        } else {
                netif_carrier_off(net);
                netif_stop_queue(net);