armv7m: Convert bitband.source-memory to DEFINE_PROP_LINK

Signed-off-by: NFam Zheng <famz@redhat.com>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20170905131149.10669-2-famz@redhat.com
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/armv7m.c

@@ -97,12 +97,6 @@ static void bitband_init(Object *obj)
     BitBandState *s = BITBAND(obj);
     SysBusDevice *dev = SYS_BUS_DEVICE(obj);
 
-    object_property_add_link(obj, "source-memory",
-                             TYPE_MEMORY_REGION,
-                             (Object **)&s->source_memory,
-                             qdev_prop_allow_set_link_before_realize,
-                             OBJ_PROP_LINK_UNREF_ON_RELEASE,
-                             &error_abort);
     memory_region_init_io(&s->iomem, obj, &bitband_ops, s,
                           "bitband", 0x02000000);
     sysbus_init_mmio(dev, &s->iomem);
@@ -349,6 +343,8 @@ void armv7m_load_kernel(ARMCPU *cpu, const char *kernel_filename, int mem_size)
 
 static Property bitband_properties[] = {
     DEFINE_PROP_UINT32("base", BitBandState, base, 0),
+    DEFINE_PROP_LINK("source-memory", BitBandState, source_memory,
+                     TYPE_MEMORY_REGION, MemoryRegion *),
     DEFINE_PROP_END_OF_LIST(),
 };