Re: [Qemu-devel] [PATCH v3 2/2] hw/pci-bridge: Convert pxb initialization functions to Error

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Apr 08, 2016 at 03:55:54PM +0800, Wei Jiangang wrote:
> Firstly, convert pxb_dev_init_common() to Error and rename
> it to pxb_dev_realize_common().
> Actually, pxb_register_bus() is converted as well.
> 
> And then,
> convert pxb_dev_initfn() and pxb_pcie_dev_initfn() to Error,
> rename them to pxb_dev_realize() and pxb_pcie_dev_realize()
> respectively.
> 
> Signed-off-by: Wei Jiangang <weijg.fnst@cn.fujitsu.com>
> Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>

Pls remember to re-post this after 2.6 is out.
> ---
>  hw/pci-bridge/pci_expander_bridge.c | 52 ++++++++++++++++++-------------------
>  1 file changed, 25 insertions(+), 27 deletions(-)
> 
> diff --git a/hw/pci-bridge/pci_expander_bridge.c b/hw/pci-bridge/pci_expander_bridge.c
> index ba320bd..cbea9c1 100644
> --- a/hw/pci-bridge/pci_expander_bridge.c
> +++ b/hw/pci-bridge/pci_expander_bridge.c
> @@ -11,6 +11,7 @@
>   */
>  
>  #include "qemu/osdep.h"
> +#include "qapi/error.h"
>  #include "hw/pci/pci.h"
>  #include "hw/pci/pci_bus.h"
>  #include "hw/pci/pci_host.h"
> @@ -160,30 +161,25 @@ static const TypeInfo pxb_host_info = {
>  };
>  
>  /*
> - * Registers the PXB bus as a child of the i440fx root bus.
> - *
> - * Returns 0 on successs, -1 if i440fx host was not
> - * found or the bus number is already in use.
> + * Registers the PXB bus as a child of pci host root bus.
>   */
> -static int pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus)
> +static void pxb_register_bus(PCIDevice *dev, PCIBus *pxb_bus, Error **errp)
>  {
>      PCIBus *bus = dev->bus;
>      int pxb_bus_num = pci_bus_num(pxb_bus);
>  
>      if (bus->parent_dev) {
> -        error_report("PXB devices can be attached only to root bus.");
> -        return -1;
> +        error_setg(errp, "PXB devices can be attached only to root bus");
> +        return;
>      }
>  
>      QLIST_FOREACH(bus, &bus->child, sibling) {
>          if (pci_bus_num(bus) == pxb_bus_num) {
> -            error_report("Bus %d is already in use.", pxb_bus_num);
> -            return -1;
> +            error_setg(errp, "Bus %d is already in use", pxb_bus_num);
> +            return;
>          }
>      }
>      QLIST_INSERT_HEAD(&dev->bus->child, pxb_bus, sibling);
> -
> -    return 0;
>  }
>  
>  static int pxb_map_irq_fn(PCIDevice *pci_dev, int pin)
> @@ -213,17 +209,18 @@ static gint pxb_compare(gconstpointer a, gconstpointer b)
>             0;
>  }
>  
> -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;
>  
>      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;
>      }
>  
>      if (dev->qdev.id && *dev->qdev.id) {
> @@ -248,7 +245,9 @@ 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 +261,22 @@ 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 +298,7 @@ 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 +316,14 @@ 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 +331,7 @@ 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;
> -- 
> 1.9.3
> 
>