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virtio: fix module/device unloading

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The virtio code never hooked through the ->remove callback.  Although
noone supports device removal at the moment, this code is already
needed for module unloading.

This of course also revealed bugs in virtio_blk, virtio_net and lguest
unloading paths.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2007-11-19 11:20:42 -05:00
parent d1c856e0f1
commit 74b2553f1d
4 changed files with 28 additions and 5 deletions
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10
drivers/block/virtio_blk.c
View File

@ -223,7 +223,7 @@ static int virtblk_probe(struct virtio_device *vdev)
err = virtio_config_val(vdev, VIRTIO_CONFIG_BLK_F_CAPACITY, &cap);
if (err) {
dev_err(&vdev->dev, "Bad/missing capacity in config\n");
goto out_put_disk;
goto out_cleanup_queue;
}
/* If capacity is too big, truncate with warning. */
@ -239,7 +239,7 @@ static int virtblk_probe(struct virtio_device *vdev)
blk_queue_max_segment_size(vblk->disk->queue, v);
else if (err != -ENOENT) {
dev_err(&vdev->dev, "Bad SIZE_MAX in config\n");
goto out_put_disk;
goto out_cleanup_queue;
}
err = virtio_config_val(vdev, VIRTIO_CONFIG_BLK_F_SEG_MAX, &v);
@ -247,12 +247,14 @@ static int virtblk_probe(struct virtio_device *vdev)
blk_queue_max_hw_segments(vblk->disk->queue, v);
else if (err != -ENOENT) {
dev_err(&vdev->dev, "Bad SEG_MAX in config\n");
goto out_put_disk;
goto out_cleanup_queue;
}
add_disk(vblk->disk);
return 0;
out_cleanup_queue:
blk_cleanup_queue(vblk->disk->queue);
out_put_disk:
put_disk(vblk->disk);
out_unregister_blkdev:
@ -277,6 +279,8 @@ static void virtblk_remove(struct virtio_device *vdev)
put_disk(vblk->disk);
unregister_blkdev(major, "virtblk");
mempool_destroy(vblk->pool);
/* There should be nothing in the queue now, so no need to shutdown */
vdev->config->del_vq(vblk->vq);
kfree(vblk);
}

2
drivers/lguest/lguest_device.c
View File

@ -247,6 +247,8 @@ static void lg_del_vq(struct virtqueue *vq)
{
struct lguest_vq_info *lvq = vq->priv;
/* Release the interrupt */
free_irq(lvq->config.irq, vq);
/* Tell virtio_ring.c to free the virtqueue. */
vring_del_virtqueue(vq);
/* Unmap the pages containing the ring. */

8
drivers/net/virtio_net.c
View File

@ -404,8 +404,12 @@ static int virtnet_probe(struct virtio_device *vdev)
static void virtnet_remove(struct virtio_device *vdev)
{
unregister_netdev(vdev->priv);
free_netdev(vdev->priv);
struct virtnet_info *vi = vdev->priv;
vdev->config->del_vq(vi->svq);
vdev->config->del_vq(vi->rvq);
unregister_netdev(vi->dev);
free_netdev(vi->dev);
}
static struct virtio_device_id id_table[] = {

13
drivers/virtio/virtio.c
View File

@ -96,10 +96,23 @@ static int virtio_dev_probe(struct device *_d)
return err;
}
static int virtio_dev_remove(struct device *_d)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
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);
return 0;
}
int register_virtio_driver(struct virtio_driver *driver)
{
driver->driver.bus = &virtio_bus;
driver->driver.probe = virtio_dev_probe;
driver->driver.remove = virtio_dev_remove;
return driver_register(&driver->driver);
}
EXPORT_SYMBOL_GPL(register_virtio_driver);