I didn't really hit a real bug, but just happened to spot the bug:
we have decreased the counter at the beginning of vmbus_process_offer(),
so we mustn't decrease it again.

Fixes: 6f3d791f3006 ("Drivers: hv: vmbus: Fix rescind handling issues")
Signed-off-by: Dexuan Cui <de...@microsoft.com>
Cc: sta...@vger.kernel.org
Cc: Stephen Hemminger <sthem...@microsoft.com>
Cc: K. Y. Srinivasan <k...@microsoft.com>
Cc: Stable <sta...@vger.kernel.org> # 4.14 and above
---
 drivers/hv/channel_mgmt.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index ecc2bd2..f3b551a 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -527,10 +527,8 @@ static void vmbus_process_offer(struct vmbus_channel 
*newchannel)
                struct hv_device *dev
                        = newchannel->primary_channel->device_obj;
 
-               if (vmbus_add_channel_kobj(dev, newchannel)) {
-                       atomic_dec(&vmbus_connection.offer_in_progress);
+               if (vmbus_add_channel_kobj(dev, newchannel))
                        goto err_free_chan;
-               }
 
                if (channel->sc_creation_callback != NULL)
                        channel->sc_creation_callback(newchannel);
-- 
2.7.4

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