From: Stephen Hemminger Date: Tue, 20 Mar 2018 22:03:04 +0000 (-0700) Subject: hv_netvsc: change GPAD teardown order on older versions X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0ef58b0a05c12;p=openwrt%2Fstaging%2Fblogic.git 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: 0cf737808ae7 ("hv_netvsc: netvsc_teardown_gpadl() split") Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index 12c044baf1af..37b0a30d6b03 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);