From d1883e7052eeffca3f42922bb31fa44d0992c6a6 Mon Sep 17 00:00:00 2001
From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: Tue, 27 Dec 2011 13:49:37 -0800
Subject: [PATCH] Drivers:hv: Fix a bug in vmbus_driver_unregister()

commit 8f257a142fc3868d69de3f996b95d7bdbc509560 upstream.

The function vmbus_exists() was introduced recently to deal with cases where
the vmbus driver failed to initialize and yet other Hyper-V drivers attempted
to register with the vmbus bus driver. This patch introduced a bug where
vmbus_driver_unregister() would fail to unregister the driver. This patch
fixes the problem.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Fuzhou Chen <fuzhouch@microsoft.com>
Cc: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
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