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Drivers: hv: vmbus: don't send CHANNELMSG_UNLOAD on pre-Win2012R2 hosts 

Pre-Win2012R2 hosts don't properly handle CHANNELMSG_UNLOAD and
wait_for_completion() hangs. Avoid sending such request on old hosts.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2015-08-01 16:08:19 -07:00 committed by Greg Kroah-Hartman
parent e26009aad0
commit 4a54243fc0
1 changed files with 4 additions and 0 deletions
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4
drivers/hv/channel_mgmt.c
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@ -469,6 +469,10 @@ void vmbus_initiate_unload(void)
{ {
struct vmbus_channel_message_header hdr; struct vmbus_channel_message_header hdr;
/* Pre-Win2012R2 hosts don't support reconnect */
if (vmbus_proto_version < VERSION_WIN8_1)
return;
init_completion(&vmbus_connection.unload_event); init_completion(&vmbus_connection.unload_event);
memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));
hdr.msgtype = CHANNELMSG_UNLOAD; hdr.msgtype = CHANNELMSG_UNLOAD;