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[PATCH] vmbus: unregister device_obj->channels_kset

Fixes: c2e5df616e1a ("vmbus: add per-channel sysfs info")

Without the patch, a device can't be thoroughly destroyed, because
vmbus_device_register() -> kset_create_and_add() still holds a reference
to the hv_device's device.kobj.

Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>

The patch is based on char-misc.git's char-misc-next branch.

 drivers/hv/vmbus_drv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 6a86746..4f3faf5 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1378,6 +1378,8 @@ void vmbus_device_unregister(struct hv_device *device_obj)
 	pr_debug("child device %s unregistered\n",
+	kset_unregister(device_obj->channels_kset);
 	 * Kick off the process of unregistering the device.
 	 * This will call vmbus_remove() and eventually vmbus_device_release()