Re: [PATCH v2 12/58] qdev: Convert uses of qdev_set_parent_bus() manually

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 5/29/20 3:44 PM, Markus Armbruster wrote:
> Same transformation as in the previous commit.  Manual, because
> convincing Coccinelle to transform these cases is somewhere between
> not worthwhile and infeasible (at least for me).
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  hw/pci-host/prep.c |  3 +--
>  hw/ppc/pnv.c       |  6 ++----
>  hw/s390x/sclp.c    | 10 ++++------
>  3 files changed, 7 insertions(+), 12 deletions(-)
> 
> diff --git a/hw/pci-host/prep.c b/hw/pci-host/prep.c
> index c821ef889d..42c7e63a60 100644
> --- a/hw/pci-host/prep.c
> +++ b/hw/pci-host/prep.c
> @@ -268,7 +268,7 @@ static void raven_pcihost_realizefn(DeviceState *d, Error **errp)
>      memory_region_add_subregion(address_space_mem, 0xbffffff0, &s->pci_intack);
>  
>      /* TODO Remove once realize propagates to child devices. */
> -    object_property_set_bool(OBJECT(&s->pci_dev), true, "realized", errp);
> +    qdev_realize(DEVICE(&s->pci_dev), BUS(&s->pci_bus), errp);
>  }
>  
>  static void raven_pcihost_initfn(Object *obj)
> @@ -308,7 +308,6 @@ static void raven_pcihost_initfn(Object *obj)
>  
>      object_initialize(&s->pci_dev, sizeof(s->pci_dev), TYPE_RAVEN_PCI_DEVICE);
>      pci_dev = DEVICE(&s->pci_dev);
> -    qdev_set_parent_bus(pci_dev, BUS(&s->pci_bus));
>      object_property_set_int(OBJECT(&s->pci_dev), PCI_DEVFN(0, 0), "addr",
>                              NULL);
>      qdev_prop_set_bit(pci_dev, "multifunction", false);
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 8562af3fe0..e0588285a2 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1212,12 +1212,11 @@ static void pnv_chip_power8_realize(DeviceState *dev, Error **errp)
>          object_property_set_int(OBJECT(phb), i, "index", &error_fatal);
>          object_property_set_int(OBJECT(phb), chip->chip_id, "chip-id",
>                                  &error_fatal);
> -        object_property_set_bool(OBJECT(phb), true, "realized", &local_err);
> +        qdev_realize(DEVICE(phb), NULL, &local_err);
>          if (local_err) {
>              error_propagate(errp, local_err);
>              return;
>          }
> -        qdev_set_parent_bus(DEVICE(phb), sysbus_get_default());
>  
>          /* Populate the XSCOM address space. */
>          pnv_xscom_add_subregion(chip,
> @@ -1422,12 +1421,11 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>              object_property_set_int(obj, PNV_PHB4_DEVICE_ID, "device-id",
>                                      &error_fatal);
>              object_property_set_link(obj, OBJECT(stack), "stack", &error_abort);
> -            object_property_set_bool(obj, true, "realized", &local_err);
> +            qdev_realize(DEVICE(obj), NULL, &local_err);
>              if (local_err) {
>                  error_propagate(errp, local_err);
>                  return;
>              }
> -            qdev_set_parent_bus(DEVICE(obj), sysbus_get_default());
>  
>              /* Populate the XSCOM address space. */
>              pnv_xscom_add_subregion(chip,
> diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
> index 20aca30ac4..40e27a8cb4 100644
> --- a/hw/s390x/sclp.c
> +++ b/hw/s390x/sclp.c
> @@ -333,17 +333,15 @@ static void sclp_realize(DeviceState *dev, Error **errp)
>      uint64_t hw_limit;
>      int ret;
>  
> -    object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
> -                             &err);
> -    if (err) {
> -        goto out;
> -    }
>      /*
>       * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
>       * as we can't find a fitting bus via the qom tree, we have to add the
>       * event facility to the sysbus, so e.g. a sclp console can be created.
>       */
> -    qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
> +    qdev_realize(DEVICE(sclp->event_facility), NULL, &err);

I agree with the API change, but I find using sysbus_get_default() way
clearer than using NULL. I'v go the other way around, replace bus=NULL
by an explicit bus=sysbus_get_default() in our codebase.

Can be done later, I know... But we can also keep sysbus_get_default()
in this patch ;)

Whichever you prefer (mine is keeping it):
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

> +    if (err) {
> +        goto out;
> +    }
>  
>      ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
>      if (ret == -E2BIG) {
>