virtio: reset function

[pandora-kernel.git] / drivers / virtio / virtio.c

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 303cb6f..7dddb18 100644 (file)
--- 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);