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authorMichael S. Tsirkin <mst@redhat.com>2014-12-04 20:20:27 +0200
committerMichael S. Tsirkin <mst@redhat.com>2014-12-09 16:32:32 +0200
commit5c609a5ef05d98e26778824ba84581fe5e400db6 (patch)
tree487da89e8ad7ef9d3bcb485ae877518f1669e18b /drivers/virtio
parentce15408f350c4b97635618692a45aedabfdd2696 (diff)
downloadlinux-5c609a5ef05d98e26778824ba84581fe5e400db6.tar.bz2
virtio: allow finalize_features to fail
This will make it easy for transports to validate features and return failure. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio.c21
-rw-r--r--drivers/virtio/virtio_mmio.c4
-rw-r--r--drivers/virtio/virtio_pci.c4
3 files changed, 20 insertions, 9 deletions
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index 224f85442f3f..e1673a511d17 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -212,7 +212,9 @@ static int virtio_dev_probe(struct device *_d)
if (device_features & (1ULL << i))
__virtio_set_bit(dev, i);
- dev->config->finalize_features(dev);
+ err = dev->config->finalize_features(dev);
+ if (err)
+ goto err;
if (virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK);
@@ -354,6 +356,7 @@ EXPORT_SYMBOL_GPL(virtio_device_freeze);
int virtio_device_restore(struct virtio_device *dev)
{
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
+ int ret;
/* We always start by resetting the device, in case a previous
* driver messed it up. */
@@ -373,14 +376,14 @@ int virtio_device_restore(struct virtio_device *dev)
/* We have a driver! */
add_status(dev, VIRTIO_CONFIG_S_DRIVER);
- dev->config->finalize_features(dev);
+ ret = dev->config->finalize_features(dev);
+ if (ret)
+ goto err;
if (drv->restore) {
- int ret = drv->restore(dev);
- if (ret) {
- add_status(dev, VIRTIO_CONFIG_S_FAILED);
- return ret;
- }
+ ret = drv->restore(dev);
+ if (ret)
+ goto err;
}
/* Finally, tell the device we're all set */
@@ -389,6 +392,10 @@ int virtio_device_restore(struct virtio_device *dev)
virtio_config_enable(dev);
return 0;
+
+err:
+ add_status(dev, VIRTIO_CONFIG_S_FAILED);
+ return ret;
}
EXPORT_SYMBOL_GPL(virtio_device_restore);
#endif
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index aec1daee9ada..5219210d31ce 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -152,7 +152,7 @@ static u64 vm_get_features(struct virtio_device *vdev)
return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES);
}
-static void vm_finalize_features(struct virtio_device *vdev)
+static int vm_finalize_features(struct virtio_device *vdev)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
@@ -164,6 +164,8 @@ static void vm_finalize_features(struct virtio_device *vdev)
writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL);
writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES);
+
+ return 0;
}
static void vm_get(struct virtio_device *vdev, unsigned offset,
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index dd6df979862b..9be59d9f2f19 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -112,7 +112,7 @@ static u64 vp_get_features(struct virtio_device *vdev)
}
/* virtio config->finalize_features() implementation */
-static void vp_finalize_features(struct virtio_device *vdev)
+static int vp_finalize_features(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
@@ -124,6 +124,8 @@ static void vp_finalize_features(struct virtio_device *vdev)
/* We only support 32 feature bits. */
iowrite32(vdev->features, vp_dev->ioaddr + VIRTIO_PCI_GUEST_FEATURES);
+
+ return 0;
}
/* virtio config->get() implementation */