Re: [Qemu-devel] [PATCH v2 2/2] hw/pci-bridge: Convert pxb initialization functions to Error

[Cao jin <caoj.fnst@cn.fujitsu.com>]

On 03/23/2016 03:26 PM, Wei Jiangang wrote:

>
> -static int pxb_dev_init_common(PCIDevice *dev, bool pcie)
> +static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
>   {
>       PXBDev *pxb = convert_to_pxb(dev);
>       DeviceState *ds, *bds = NULL;
>       PCIBus *bus;
>       const char *dev_name = NULL;
> +    Error *local_err = NULL;
>

the preferred style I think, is /*err/

>       if (pxb->numa_node != NUMA_NODE_UNASSIGNED &&
>           pxb->numa_node >= nb_numa_nodes) {
> -        error_report("Illegal numa node %d.", pxb->numa_node);
> -        return -EINVAL;
> +        error_setg(errp, "Illegal numa node %d", pxb->numa_node);
> +        return;

since we have local /*err/ to avoid null /**errp/ venture, I guess it 
should be used here too.

>       }
>
>       if (dev->qdev.id && *dev->qdev.id) {
> @@ -248,7 +244,9 @@ static int pxb_dev_init_common(PCIDevice *dev, bool pcie)
>
>       PCI_HOST_BRIDGE(ds)->bus = bus;
>
> -    if (pxb_register_bus(dev, bus)) {
> +    pxb_register_bus(dev, bus, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
>           goto err_register_bus;
>       }
>
> @@ -262,23 +260,22 @@ static int pxb_dev_init_common(PCIDevice *dev, bool pcie)
>       pci_config_set_class(dev->config, PCI_CLASS_BRIDGE_HOST);
>
>       pxb_dev_list = g_list_insert_sorted(pxb_dev_list, pxb, pxb_compare);
> -    return 0;
> +    return;
>
>   err_register_bus:
>       object_unref(OBJECT(bds));
>       object_unparent(OBJECT(bus));
>       object_unref(OBJECT(ds));
> -    return -EINVAL;
>   }
>
> -static int pxb_dev_initfn(PCIDevice *dev)
> +static void pxb_dev_realize(PCIDevice *dev, Error **errp)
>   {
>       if (pci_bus_is_express(dev->bus)) {
> -        error_report("pxb devices cannot reside on a PCIe bus!");
> -        return -EINVAL;
> +        error_setg(errp, "pxb devices cannot reside on a PCIe bus");
> +        return;
>       }
>
> -    return pxb_dev_init_common(dev, false);
> +    pxb_dev_realize_common(dev, false, errp);
>   }
>
>   static void pxb_dev_exitfn(PCIDevice *pci_dev)
> @@ -300,7 +297,7 @@ static void pxb_dev_class_init(ObjectClass *klass, void *data)
>       DeviceClass *dc = DEVICE_CLASS(klass);
>       PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
>
> -    k->init = pxb_dev_initfn;
> +    k->realize = pxb_dev_realize;
>       k->exit = pxb_dev_exitfn;
>       k->vendor_id = PCI_VENDOR_ID_REDHAT;
>       k->device_id = PCI_DEVICE_ID_REDHAT_PXB;
> @@ -318,14 +315,14 @@ static const TypeInfo pxb_dev_info = {
>       .class_init    = pxb_dev_class_init,
>   };
>
> -static int pxb_pcie_dev_initfn(PCIDevice *dev)
> +static void pxb_pcie_dev_realize(PCIDevice *dev, Error **errp)
>   {
>       if (!pci_bus_is_express(dev->bus)) {
> -        error_report("pxb-pcie devices cannot reside on a PCI bus!");
> -        return -EINVAL;
> +        error_setg(errp, "pxb-pcie devices cannot reside on a PCI bus");
> +        return;
>       }
>
> -    return pxb_dev_init_common(dev, true);
> +    pxb_dev_realize_common(dev, true, errp);
>   }
>
>   static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
> @@ -333,7 +330,7 @@ static void pxb_pcie_dev_class_init(ObjectClass *klass, void *data)
>       DeviceClass *dc = DEVICE_CLASS(klass);
>       PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
>
> -    k->init = pxb_pcie_dev_initfn;
> +    k->realize = pxb_pcie_dev_realize;
>       k->exit = pxb_dev_exitfn;
>       k->vendor_id = PCI_VENDOR_ID_REDHAT;
>       k->device_id = PCI_DEVICE_ID_REDHAT_PXB_PCIE;
>

-- 
Yours Sincerely,

Cao jin