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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 <mgamal@redhat.com>
Fixes: 0cf737808a ("hv_netvsc: netvsc_teardown_gpadl() split")
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2018-03-20 15:03:04 -07:00 committed by David S. Miller
parent 02400fcee2
commit 0ef58b0a05
1 changed files with 6 additions and 1 deletions
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7
drivers/net/hyperv/netvsc.c
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@ -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);