Re: [Qemu-devel] [PATCH v1 4/8] spapr: local error handling in hotplug handler functions

[Greg Kurz <groug@kaod.org>]

On Thu,  7 Jun 2018 18:52:14 +0200
David Hildenbrand <david@redhat.com> wrote:

> Let's introduce and use local error variables in the hotplug handler
> functions.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---

Reviewed-by: Greg Kurz <groug@kaod.org>

>  hw/ppc/spapr.c | 29 ++++++++++++++++++++---------
>  1 file changed, 20 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index a12be24ca9..4447cb197f 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -3576,11 +3576,14 @@ out:
>  static void spapr_machine_device_plug(HotplugHandler *hotplug_dev,
>                                        DeviceState *dev, Error **errp)
>  {
> +    Error *local_err = NULL;
> +
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> -        spapr_memory_plug(hotplug_dev, dev, errp);
> +        spapr_memory_plug(hotplug_dev, dev, &local_err);
>      } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> -        spapr_core_plug(hotplug_dev, dev, errp);
> +        spapr_core_plug(hotplug_dev, dev, &local_err);
>      }
> +    error_propagate(errp, local_err);
>  }
>  
>  static void spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
> @@ -3588,10 +3591,11 @@ static void spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
>  {
>      sPAPRMachineState *sms = SPAPR_MACHINE(OBJECT(hotplug_dev));
>      MachineClass *mc = MACHINE_GET_CLASS(sms);
> +    Error *local_err = NULL;
>  
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
>          if (spapr_ovec_test(sms->ov5_cas, OV5_HP_EVT)) {
> -            spapr_memory_unplug_request(hotplug_dev, dev, errp);
> +            spapr_memory_unplug_request(hotplug_dev, dev, &local_err);
>          } else {
>              /* NOTE: this means there is a window after guest reset, prior to
>               * CAS negotiation, where unplug requests will fail due to the
> @@ -3599,25 +3603,32 @@ static void spapr_machine_device_unplug_request(HotplugHandler *hotplug_dev,
>               * the case with PCI unplug, where the events will be queued and
>               * eventually handled by the guest after boot
>               */
> -            error_setg(errp, "Memory hot unplug not supported for this guest");
> +            error_setg(&local_err,
> +                       "Memory hot unplug not supported for this guest");
>          }
>      } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
>          if (!mc->has_hotpluggable_cpus) {
> -            error_setg(errp, "CPU hot unplug not supported on this machine");
> -            return;
> +            error_setg(&local_err,
> +                       "CPU hot unplug not supported on this machine");
> +            goto out;
>          }
> -        spapr_core_unplug_request(hotplug_dev, dev, errp);
> +        spapr_core_unplug_request(hotplug_dev, dev, &local_err);
>      }
> +out:
> +    error_propagate(errp, local_err);
>  }
>  
>  static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev,
>                                            DeviceState *dev, Error **errp)
>  {
> +    Error *local_err = NULL;
> +
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM)) {
> -        spapr_memory_pre_plug(hotplug_dev, dev, errp);
> +        spapr_memory_pre_plug(hotplug_dev, dev, &local_err);
>      } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> -        spapr_core_pre_plug(hotplug_dev, dev, errp);
> +        spapr_core_pre_plug(hotplug_dev, dev, &local_err);
>      }
> +    error_propagate(errp, local_err);
>  }
>  
>  static HotplugHandler *spapr_get_hotplug_handler(MachineState *machine,