diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/virtio_blk.c | 6 | ||||
| -rw-r--r-- | drivers/lguest/lguest_device.c | 14 | ||||
| -rw-r--r-- | drivers/net/virtio_net.c | 5 | ||||
| -rw-r--r-- | drivers/virtio/virtio.c | 12 | ||||
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 11 |
5 files changed, 31 insertions, 17 deletions
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 54a8017ad48..6143337527e 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -264,12 +264,16 @@ static void virtblk_remove(struct virtio_device *vdev) struct virtio_blk *vblk = vdev->priv; int major = vblk->disk->major; + /* Nothing should be pending. */ BUG_ON(!list_empty(&vblk->reqs)); + + /* Stop all the virtqueues. */ + vdev->config->reset(vdev); + blk_cleanup_queue(vblk->disk->queue); 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); } diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c index ced5b44cebc..84f85e23cca 100644 --- a/drivers/lguest/lguest_device.c +++ b/drivers/lguest/lguest_device.c @@ -54,7 +54,7 @@ struct lguest_device { * * The configuration information for a device consists of one or more * virtqueues, a feature bitmaks, and some configuration bytes. The - * configuration bytes don't really matter to us: the Launcher set them up, and + * configuration bytes don't really matter to us: the Launcher sets them up, and * the driver will look at them during setup. * * A convenient routine to return the device's virtqueue config array: @@ -139,9 +139,20 @@ static u8 lg_get_status(struct virtio_device *vdev) static void lg_set_status(struct virtio_device *vdev, u8 status) { + BUG_ON(!status); to_lgdev(vdev)->desc->status = status; } +/* To reset the device, we (ab)use the NOTIFY hypercall, with the descriptor + * address of the device. The Host will zero the status and all the + * features. */ +static void lg_reset(struct virtio_device *vdev) +{ + unsigned long offset = (void *)to_lgdev(vdev)->desc - lguest_devices; + + hcall(LHCALL_NOTIFY, (max_pfn<<PAGE_SHIFT) + offset, 0, 0); +} + /* * Virtqueues * @@ -279,6 +290,7 @@ static struct virtio_config_ops lguest_config_ops = { .set = lg_set, .get_status = lg_get_status, .set_status = lg_set_status, + .reset = lg_reset, .find_vq = lg_find_vq, .del_vq = lg_del_vq, }; diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index ec43284ffd1..6e0a9fefe6c 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -390,13 +390,14 @@ static void virtnet_remove(struct virtio_device *vdev) struct virtnet_info *vi = vdev->priv; struct sk_buff *skb; + /* Stop all the virtqueues. */ + vdev->config->reset(vdev); + /* Free our skbs in send and recv queues, if any. */ - vi->rvq->vq_ops->shutdown(vi->rvq); while ((skb = __skb_dequeue(&vi->recv)) != NULL) { kfree_skb(skb); vi->num--; } - vi->svq->vq_ops->shutdown(vi->svq); while ((skb = __skb_dequeue(&vi->send)) != NULL) kfree_skb(skb); diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 303cb6f9010..7dddb186093 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); diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index dbe1d35db32..9849babd6b3 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -173,16 +173,6 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head) vq->num_free++; } -/* FIXME: We need to tell other side about removal, to synchronize. */ -static void vring_shutdown(struct virtqueue *_vq) -{ - struct vring_virtqueue *vq = to_vvq(_vq); - unsigned int i; - - for (i = 0; i < vq->vring.num; i++) - detach_buf(vq, i); -} - static inline bool more_used(const struct vring_virtqueue *vq) { return vq->last_used_idx != vq->vring.used->idx; @@ -278,7 +268,6 @@ static struct virtqueue_ops vring_vq_ops = { .kick = vring_kick, .disable_cb = vring_disable_cb, .enable_cb = vring_enable_cb, - .shutdown = vring_shutdown, }; struct virtqueue *vring_new_virtqueue(unsigned int num, |