1 files changed, 18 insertions, 47 deletions

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 69d7ea02cd48..b535483bc556 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -102,9 +102,13 @@ static int virtio_dev_remove(struct device *_d)
 	struct virtio_driver *drv = container_of(dev->dev.driver,
 						 struct virtio_driver, driver);
 
-	dev->config->set_status(dev, dev->config->get_status(dev)
-				& ~VIRTIO_CONFIG_S_DRIVER);
 	drv->remove(dev);
+
+	/* Driver should have reset device. */
+	BUG_ON(dev->config->get_status(dev));
+
+	/* Acknowledge the device's existence again. */
+	add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
 	return 0;
 }
 
@@ -130,6 +134,10 @@ int register_virtio_device(struct virtio_device *dev)
 	dev->dev.bus = &virtio_bus;
 	sprintf(dev->dev.bus_id, "%u", dev->index);
 
+	/* We always start by resetting the device, in case a previous
+	 * driver messed it up.  This also tests that code path a little. */
+	dev->config->reset(dev);
+
 	/* Acknowledge that we've seen the device. */
 	add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE);
 
@@ -148,55 +156,18 @@ void unregister_virtio_device(struct virtio_device *dev)
 }
 EXPORT_SYMBOL_GPL(unregister_virtio_device);
 
-int __virtio_config_val(struct virtio_device *vdev,
-			u8 type, void *val, size_t size)
-{
-	void *token;
-	unsigned int len;
-
-	token = vdev->config->find(vdev, type, &len);
-	if (!token)
-		return -ENOENT;
-
-	if (len != size)
-		return -EIO;
-
-	vdev->config->get(vdev, token, val, size);
-	return 0;
-}
-EXPORT_SYMBOL_GPL(__virtio_config_val);
-
-int virtio_use_bit(struct virtio_device *vdev,
-		   void *token, unsigned int len, unsigned int bitnum)
-{
-	unsigned long bits[16];
-
-	/* This makes it convenient to pass-through find() results. */
-	if (!token)
-		return 0;
-
-	/* bit not in range of this bitfield? */
-	if (bitnum * 8 >= len / 2)
-		return 0;
-
-	/* Giant feature bitfields are silly. */
-	BUG_ON(len > sizeof(bits));
-	vdev->config->get(vdev, token, bits, len);
-
-	if (!test_bit(bitnum, bits))
-		return 0;
-
-	/* Set acknowledge bit, and write it back. */
-	set_bit(bitnum + len * 8 / 2, bits);
-	vdev->config->set(vdev, token, bits, len);
-	return 1;
-}
-EXPORT_SYMBOL_GPL(virtio_use_bit);
-
 static int virtio_init(void)
 {
 	if (bus_register(&virtio_bus) != 0)
 		panic("virtio bus registration failed");
 	return 0;
 }
+
+static void __exit virtio_exit(void)
+{
+	bus_unregister(&virtio_bus);
+}
 core_initcall(virtio_init);
+module_exit(virtio_exit);
+
+MODULE_LICENSE("GPL");