Staging: hv: blkvsc_drv: Cleanup the blkvsc_drv_exit() function

To conform to the Linux device model, the device should persist even
when there is no driver bound to it. Cleanup the blkvsc_drv_exit() routine
keeping this in mind.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/blkvsc_drv.c

@@ -833,42 +833,11 @@ static int blkvsc_drv_init(void)
 	return ret;
 }
 
-static int blkvsc_drv_exit_cb(struct device *dev, void *data)
-{
-	struct device **curr = (struct device **)data;
-	*curr = dev;
-	return 1; /* stop iterating */
-}
 
 static void blkvsc_drv_exit(void)
 {
-	struct hv_driver *drv = &blkvsc_drv;
-	struct device *current_dev;
-	int ret;
-
-	while (1) {
-		current_dev = NULL;
-
-		/* Get the device */
-		ret = driver_for_each_device(&drv->driver, NULL,
-					     (void *) &current_dev,
-					     blkvsc_drv_exit_cb);
-
-		if (ret)
-			DPRINT_WARN(BLKVSC_DRV,
-				    "driver_for_each_device returned %d", ret);
-
-
-		if (current_dev == NULL)
-			break;
-
-		/* Initiate removal from the top-down */
-		device_unregister(current_dev);
-	}
-
-	vmbus_child_driver_unregister(&drv->driver);
 
-	return;
+	vmbus_child_driver_unregister(&blkvsc_drv.driver);
 }
 
 /*