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authorVitaly Kuznetsov <vkuznets@redhat.com>2015-08-02 02:08:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-08-05 08:29:45 +0300
commit4a54243fc08f0edda1303bb666f0da68c378c036 (patch)
treed150cafb183ae3bfb01421763839e7f7291e72c8 /drivers/hv
parente26009aad095feae45a6e79bb022c55a969ecded (diff)
downloadlinux-4a54243fc08f0edda1303bb666f0da68c378c036.tar.xz
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>
Diffstat (limited to 'drivers/hv')
-rw-r--r--drivers/hv/channel_mgmt.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 4506a6623618..00ba3f36f193 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -469,6 +469,10 @@ void vmbus_initiate_unload(void)
{
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);
memset(&hdr, 0, sizeof(struct vmbus_channel_message_header));
hdr.msgtype = CHANNELMSG_UNLOAD;