From b3ad3b718aa06d93de58f4f7c675aad23123cf58 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Tue, 20 Mar 2018 15:03:04 -0700 Subject: [PATCH] hv_netvsc: change GPAD teardown order on older versions On older versions of Windows, the host ignores messages after vmbus channel is closed. Workaround this by doing what Windows does and send the teardown before close on older versions of NVSP protocol. Reported-by: Mohammed Gamal Fixes: 30a734dfed91 ("hv_netvsc: netvsc_teardown_gpadl() split") Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- drivers/net/hyperv/netvsc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 12c044baf1af7..37b0a30d6b034 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -571,10 +571,15 @@ void netvsc_device_remove(struct hv_device *device) */ netdev_dbg(ndev, "net device safe to remove\n"); + /* older versions require that buffer be revoked before close */ + if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_4) + netvsc_teardown_gpadl(device, net_device); + /* Now, we can close the channel safely */ vmbus_close(device->channel); - netvsc_teardown_gpadl(device, net_device); + if (net_device->nvsp_version >= NVSP_PROTOCOL_VERSION_4) + netvsc_teardown_gpadl(device, net_device); /* Release all resources */ free_netvsc_device_rcu(net_device); -- 2.39.5