Re: [PATCH 1/5] pc-dimm: Drop @errp argument of pc_dimm_plug()

[Greg Kurz <groug@kaod.org>]

On Fri, 23 Oct 2020 21:19:19 +0200
Igor Mammedov <imammedo@redhat.com> wrote:

> On Mon, 19 Oct 2020 10:48:04 +0200
> Greg Kurz <groug@kaod.org> wrote:
> 
> > pc_dimm_plug() doesn't use it. It only aborts on error.
> > 
> > Drop @errp and adapt the callers accordingly.
> > 
> > Signed-off-by: Greg Kurz <groug@kaod.org>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> 
> arguably the same should be done in spapr.
> 

As explained in another mail, we have to keep spapr_drc_attach()
at plug time and this can legitimately fail if an unplug operation
is pending for the device. We certainly prefer to report this as
an error rather than aborting.

> > ---
> >  hw/arm/virt.c            |    9 +--------
> >  hw/i386/pc.c             |    8 +-------
> >  hw/mem/pc-dimm.c         |    2 +-
> >  hw/ppc/spapr.c           |    5 +----
> >  include/hw/mem/pc-dimm.h |    2 +-
> >  5 files changed, 5 insertions(+), 21 deletions(-)
> > 
> > diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> > index e465a988d683..27dbeb549ef1 100644
> > --- a/hw/arm/virt.c
> > +++ b/hw/arm/virt.c
> > @@ -2261,12 +2261,8 @@ static void virt_memory_plug(HotplugHandler *hotplug_dev,
> >      VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
> >      MachineState *ms = MACHINE(hotplug_dev);
> >      bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
> > -    Error *local_err = NULL;
> >  
> > -    pc_dimm_plug(PC_DIMM(dev), MACHINE(vms), &local_err);
> > -    if (local_err) {
> > -        goto out;
> > -    }
> > +    pc_dimm_plug(PC_DIMM(dev), MACHINE(vms));
> >  
> >      if (is_nvdimm) {
> >          nvdimm_plug(ms->nvdimms_state);
> > @@ -2274,9 +2270,6 @@ static void virt_memory_plug(HotplugHandler *hotplug_dev,
> >  
> >      hotplug_handler_plug(HOTPLUG_HANDLER(vms->acpi_dev),
> >                           dev, &error_abort);
> > -
> > -out:
> > -    error_propagate(errp, local_err);
> >  }
> >  
> >  static void virt_machine_device_pre_plug_cb(HotplugHandler *hotplug_dev,
> > diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> > index e87be5d29a01..38b1be78e707 100644
> > --- a/hw/i386/pc.c
> > +++ b/hw/i386/pc.c
> > @@ -1265,24 +1265,18 @@ static void pc_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> >  static void pc_memory_plug(HotplugHandler *hotplug_dev,
> >                             DeviceState *dev, Error **errp)
> >  {
> > -    Error *local_err = NULL;
> >      PCMachineState *pcms = PC_MACHINE(hotplug_dev);
> >      X86MachineState *x86ms = X86_MACHINE(hotplug_dev);
> >      MachineState *ms = MACHINE(hotplug_dev);
> >      bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
> >  
> > -    pc_dimm_plug(PC_DIMM(dev), MACHINE(pcms), &local_err);
> > -    if (local_err) {
> > -        goto out;
> > -    }
> > +    pc_dimm_plug(PC_DIMM(dev), MACHINE(pcms));
> >  
> >      if (is_nvdimm) {
> >          nvdimm_plug(ms->nvdimms_state);
> >      }
> >  
> >      hotplug_handler_plug(x86ms->acpi_dev, dev, &error_abort);
> > -out:
> > -    error_propagate(errp, local_err);
> >  }
> >  
> >  static void pc_memory_unplug_request(HotplugHandler *hotplug_dev,
> > diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
> > index c30351070bb8..2ffc986734df 100644
> > --- a/hw/mem/pc-dimm.c
> > +++ b/hw/mem/pc-dimm.c
> > @@ -64,7 +64,7 @@ void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
> >                             errp);
> >  }
> >  
> > -void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp)
> > +void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine)
> >  {
> >      PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
> >      MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm,
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index ee716a12af73..4edd31b86915 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -3438,10 +3438,7 @@ static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
> >  
> >      size = memory_device_get_region_size(MEMORY_DEVICE(dev), &error_abort);
> >  
> > -    pc_dimm_plug(dimm, MACHINE(ms), &local_err);
> > -    if (local_err) {
> > -        goto out;
> > -    }
> > +    pc_dimm_plug(dimm, MACHINE(ms));
> >  
> >      if (!is_nvdimm) {
> >          addr = object_property_get_uint(OBJECT(dimm),
> > diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
> > index aec9527fdd96..3d3db82641f8 100644
> > --- a/include/hw/mem/pc-dimm.h
> > +++ b/include/hw/mem/pc-dimm.h
> > @@ -72,6 +72,6 @@ struct PCDIMMDeviceClass {
> >  
> >  void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
> >                        const uint64_t *legacy_align, Error **errp);
> > -void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp);
> > +void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine);
> >  void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine);
> >  #endif
> > 
> > 
> > 
> 
>