Re: [Qemu-devel] [PATCH v2 2/2] hw: vmmouse: drop DEFINE_PROP_PTR()

[Darren Kenny]

Hi Li Qiang,

This is only a suggestion, I'm sure someone else might also correct
me, but I'm not sure the subject above really describes what is
happening in the commit as a whole.
It seems to miss the point that the main change here is to use a
link type property, so maybe it might be better written as something
along the lines of:

 Subject: [PATCH v2 2/2] hw: vmmouse: use link property instead of pointer
 
 Drop DEFINE_PROP_PTR() and replace with a link pointer via an
 instance init function (vmmouse_instance_initfn).

But that's only my interpretation, you may have a better version.

Thanks,

Darren.

On Tue, Nov 27, 2018 at 02:02:03AM -0800, Li Qiang wrote:
Use link property instead.

Signed-off-by: Li Qiang <liq...@gmail.com>
---

Change since v1: use error_abort in object_property_set_link()

hw/i386/pc.c      |  3 ++-
hw/i386/vmmouse.c | 17 +++++++++++------
2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 73c7b777a0..64f0f233b8 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1552,7 +1552,8 @@ static void pc_superio_init(ISABus *isa_bus, bool 
create_fdctrl, bool no_vmport)
    }
    if (vmmouse) {
        DeviceState *dev = DEVICE(vmmouse);
-        qdev_prop_set_ptr(dev, "ps2_mouse", i8042);
+        object_property_set_link(OBJECT(dev), OBJECT(i8042),
+                                 "ps2_mouse", &error_abort);
        qdev_init_nofail(dev);
    }
    port92 = isa_create_simple(isa_bus, TYPE_PORT92);
diff --git a/hw/i386/vmmouse.c b/hw/i386/vmmouse.c
index 4412eaf604..f63aac6673 100644
--- a/hw/i386/vmmouse.c
+++ b/hw/i386/vmmouse.c
@@ -27,6 +27,7 @@
#include "hw/i386/pc.h"
#include "hw/input/i8042.h"
#include "hw/qdev.h"
+#include "qapi/error.h"

/* debug only vmmouse */
//#define DEBUG_VMMOUSE
@@ -271,10 +272,15 @@ static void vmmouse_realizefn(DeviceState *dev, Error 
**errp)
    vmport_register(VMMOUSE_DATA, vmmouse_ioport_read, s);
}

-static Property vmmouse_properties[] = {
-    DEFINE_PROP_PTR("ps2_mouse", VMMouseState, ps2_mouse),
-    DEFINE_PROP_END_OF_LIST(),
-};
+static void vmmouse_instance_initfn(Object *obj)
+{
+    VMMouseState *s = VMMOUSE(obj);
+
+    object_property_add_link(obj, "ps2_mouse", TYPE_I8042,
+                             (Object **)&s->ps2_mouse,
+                             qdev_prop_allow_set_link_before_realize,
+                             0, &error_abort);
+}

static void vmmouse_class_initfn(ObjectClass *klass, void *data)
{
@@ -283,8 +289,6 @@ static void vmmouse_class_initfn(ObjectClass *klass, void 
*data)
    dc->realize = vmmouse_realizefn;
    dc->reset = vmmouse_reset;
    dc->vmsd = &vmstate_vmmouse;
-    dc->props = vmmouse_properties;
-    /* Reason: pointer property "ps2_mouse" */
    dc->user_creatable = false;
}

@@ -292,6 +296,7 @@ static const TypeInfo vmmouse_info = {
    .name          = TYPE_VMMOUSE,
    .parent        = TYPE_ISA_DEVICE,
    .instance_size = sizeof(VMMouseState),
+    .instance_init = vmmouse_instance_initfn,
    .class_init    = vmmouse_class_initfn,
};

--
2.11.0