Re: [Qemu-devel] [PATCH 02/13] pcspk: convert "pit" property type from ptr to link

[Paolo Bonzini <pbonzini@redhat.com>]

On 17/06/2016 15:10, Efimov Vasily wrote:
> The speaker device needs pointer to ISA PIT device to operate. But according to
> qdev-properties.h, properties of pointer type should be avoided. It seems a
> link type property is a good substitution.
> 
> Signed-off-by: Efimov Vasily <real@ispras.ru>
> ---
>  hw/audio/pcspk.c         | 7 +++++--
>  include/hw/audio/pcspk.h | 2 +-
>  2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
> index d259960..aa198d6 100644
> --- a/hw/audio/pcspk.c
> +++ b/hw/audio/pcspk.c
> @@ -31,6 +31,7 @@
>  #include "qemu/timer.h"
>  #include "hw/timer/i8254.h"
>  #include "hw/audio/pcspk.h"
> +#include "qapi/error.h"
>  
>  #define PCSPK_BUF_LEN 1792
>  #define PCSPK_SAMPLE_RATE 32000
> @@ -169,6 +170,9 @@ static void pcspk_initfn(Object *obj)
>      PCSpkState *s = PC_SPEAKER(obj);
>  
>      memory_region_init_io(&s->ioport, OBJECT(s), &pcspk_io_ops, s, "pcspk", 1);
> +
> +    object_property_add_link(obj, "pit", TYPE_I8254,
> +        (Object **)&s->pit, object_property_allow_set_link, 0, &error_abort);

Actually, this should use qdev_prop_allow_set_link_before_realize.

Paolo

>  }
>  
>  static void pcspk_realizefn(DeviceState *dev, Error **errp)
> @@ -183,7 +187,6 @@ static void pcspk_realizefn(DeviceState *dev, Error **errp)
>  
>  static Property pcspk_properties[] = {
>      DEFINE_PROP_UINT32("iobase", PCSpkState, iobase,  -1),
> -    DEFINE_PROP_PTR("pit", PCSpkState, pit),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> @@ -194,7 +197,7 @@ static void pcspk_class_initfn(ObjectClass *klass, void *data)
>      dc->realize = pcspk_realizefn;
>      set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
>      dc->props = pcspk_properties;
> -    /* Reason: pointer property "pit", realize sets global pcspk_state */
> +    /* Reason: realize sets global pcspk_state */
>      dc->cannot_instantiate_with_device_add_yet = true;
>  }
>  
> diff --git a/include/hw/audio/pcspk.h b/include/hw/audio/pcspk.h
> index ef95dd1..33e46a5 100644
> --- a/include/hw/audio/pcspk.h
> +++ b/include/hw/audio/pcspk.h
> @@ -38,7 +38,7 @@ static inline ISADevice *pcspk_init(ISABus *bus, ISADevice *pit)
>      isadev = isa_create(bus, TYPE_PC_SPEAKER);
>      dev = DEVICE(isadev);
>      qdev_prop_set_uint32(dev, "iobase", 0x61);
> -    qdev_prop_set_ptr(dev, "pit", pit);
> +    object_property_set_link(OBJECT(dev), OBJECT(pit), "pit", NULL);
>      qdev_init_nofail(dev);
>  
>      return isadev;
>