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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-12-04 20:20:27 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2014-12-09 16:32:32 +0200 |
| commit | 5c609a5ef05d98e26778824ba84581fe5e400db6 (patch) | |
| tree | 487da89e8ad7ef9d3bcb485ae877518f1669e18b /drivers/virtio | |
| parent | ce15408f350c4b97635618692a45aedabfdd2696 (diff) | |
| download | linux-5c609a5ef05d98e26778824ba84581fe5e400db6.tar.gz linux-5c609a5ef05d98e26778824ba84581fe5e400db6.tar.bz2 linux-5c609a5ef05d98e26778824ba84581fe5e400db6.zip | |
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.c | 21 | ||||
| -rw-r--r-- | drivers/virtio/virtio_mmio.c | 4 | ||||
| -rw-r--r-- | drivers/virtio/virtio_pci.c | 4 |
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 */ |