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hv_netvsc: change GPAD teardown order on older versions

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[ Commit 0ef58b0a05 upstream. ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger
2018-05-14 15:32:17 -07:00
committed by Greg Kroah-Hartman
parent 9c6439c7b1
commit 905f85c289
1 changed files with 6 additions and 1 deletions
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7
drivers/net/hyperv/netvsc.c
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@@ -570,10 +570,15 @@ 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);