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virtio: set VIRTIO_CONFIG_S_FEATURES_OK on restore 

virtio 1.0 devices require that drivers set VIRTIO_CONFIG_S_FEATURES_OK
after finalizing features.
virtio core missed doing this on restore, fix it up.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2014-12-11 13:37:13 +02:00
parent f01a2a811a
commit 30683a8cce
1 changed files with 23 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/virtio/virtio.c
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@ -162,6 +162,27 @@ static void virtio_config_enable(struct virtio_device *dev)
spin_unlock_irq(&dev->config_lock);
}
static int virtio_finalize_features(struct virtio_device *dev)
{
int ret = dev->config->finalize_features(dev);
unsigned status;
if (ret)
return ret;
if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1))
return 0;
add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
status = dev->config->get_status(dev);
if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
dev_err(&dev->dev, "virtio: device refuses features: %x\n",
status);
return -ENODEV;
}
return 0;
}
static int virtio_dev_probe(struct device *_d)
{
int err, i;
@ -170,7 +191,6 @@ static int virtio_dev_probe(struct device *_d)
u64 device_features;
u64 driver_features;
u64 driver_features_legacy;
unsigned status;
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
@ -208,21 +228,10 @@ static int virtio_dev_probe(struct device *_d)
if (device_features & (1ULL << i))
__virtio_set_bit(dev, i);
err = dev->config->finalize_features(dev);
err = virtio_finalize_features(dev);
if (err)
goto err;
if (virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
status = dev->config->get_status(dev);
if (!(status & VIRTIO_CONFIG_S_FEATURES_OK)) {
dev_err(_d, "virtio: device refuses features: %x\n",
status);
err = -ENODEV;
goto err;
}
}
err = drv->probe(dev);
if (err)
goto err;
@ -372,7 +381,7 @@ int virtio_device_restore(struct virtio_device *dev)
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
ret = dev->config->finalize_features(dev);
ret = virtio_finalize_features(dev);
if (ret)
goto err;