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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" <kys@microsoft.com>

    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>

    ---
    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);
    }
    EXPORT_SYMBOL_GPL(vmbus_driver_unregister);




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