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authorMichael S. Tsirkin <mst@redhat.com>2014-12-11 13:37:13 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-12-11 20:04:38 +0200
commit30683a8cce8019aa4314c37e629da5c185017166 (patch)
treed918ef1f12562036a27e35aa8d189da03f25ae06 /drivers/virtio
parentf01a2a811ae04124fc9382925038fcbbd2f0b7c8 (diff)
downloadlinux-30683a8cce8019aa4314c37e629da5c185017166.tar.bz2
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>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio.c37
1 files changed, 23 insertions, 14 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index f22665868781..b9f70dfc4751 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -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;