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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-10-22 17:41:38 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 12:05:25 +0200 |
| commit | cb3f6d9da49929797f806b4e91ec005e6fc2e9c2 (patch) | |
| tree | e345a69f99132bf1a88340229610e51d36cd5ecf | |
| parent | 890626521503318d7ac92a4a3b9feba55c0131ec (diff) | |
| download | op-kernel-dev-cb3f6d9da49929797f806b4e91ec005e6fc2e9c2.zip op-kernel-dev-cb3f6d9da49929797f806b4e91ec005e6fc2e9c2.tar.gz | |
virtio: set FEATURES_OK
set FEATURES_OK as per virtio 1.0 spec
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
| -rw-r--r-- | drivers/virtio/virtio.c | 29 | ||||
| -rw-r--r-- | include/uapi/linux/virtio_config.h | 2 |
2 files changed, 24 insertions, 7 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 746d350..9248125 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -160,6 +160,7 @@ static int virtio_dev_probe(struct device *_d) struct virtio_device *dev = dev_to_virtio(_d); struct virtio_driver *drv = drv_to_virtio(dev->dev.driver); u64 device_features; + unsigned status; /* We have a driver! */ add_status(dev, VIRTIO_CONFIG_S_DRIVER); @@ -183,18 +184,32 @@ static int virtio_dev_probe(struct device *_d) dev->config->finalize_features(dev); + 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) - add_status(dev, VIRTIO_CONFIG_S_FAILED); - else { - add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); - if (drv->scan) - drv->scan(dev); + goto err; - virtio_config_enable(dev); - } + add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); + if (drv->scan) + drv->scan(dev); + + virtio_config_enable(dev); + return 0; +err: + add_status(dev, VIRTIO_CONFIG_S_FAILED); return err; + } static int virtio_dev_remove(struct device *_d) diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 80e7381..4d05671 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -38,6 +38,8 @@ #define VIRTIO_CONFIG_S_DRIVER 2 /* Driver has used its parts of the config, and is happy */ #define VIRTIO_CONFIG_S_DRIVER_OK 4 +/* Driver has finished configuring features */ +#define VIRTIO_CONFIG_S_FEATURES_OK 8 /* We've given up on this device. */ #define VIRTIO_CONFIG_S_FAILED 0x80 |
