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Subject[27/49] Drivers:hv: Fix a bug in vmbus_driver_unregister()
3.2-stable review patch.  If anyone has any objections, please let me know.


From: "K. Y. Srinivasan" <>

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 <>
Signed-off-by: Fuzhou Chen <>
Cc: Sasha Levin <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/hv/vmbus_drv.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -627,10 +627,7 @@ void vmbus_driver_unregister(struct hv_d
pr_info("unregistering driver %s\n", hv_driver->name);

if (!vmbus_exists())
- return;
- driver_unregister(&hv_driver->driver);
+ driver_unregister(&hv_driver->driver);

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