memory-device: drop get_region_size()

There are no remaining users of get_region_size() except
memory_device_get_region_size() itself. We can make
memory_device_get_region_size() work directly on get_memory_region()
instead and drop get_region_size().

In addition, we can now use memory_device_get_region_size() in pc-dimm
code to implement get_plugged_size()"

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20181005092024.14344-12-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/hw/mem/memory-device.c b/hw/mem/memory-device.c
index 425830c65c..07749bab69 100644
--- a/hw/mem/memory-device.c
+++ b/hw/mem/memory-device.c
@@ -268,9 +268,16 @@ void memory_device_unplug_region(MachineState *ms, MemoryRegion *mr)
 uint64_t memory_device_get_region_size(const MemoryDeviceState *md,
                                        Error **errp)
 {
-    MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
+    const MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
+    MemoryRegion *mr;
 
-    return mdc->get_region_size(md, errp);
+    /* dropping const here is fine as we don't touch the memory region */
+    mr = mdc->get_memory_region((MemoryDeviceState *)md, errp);
+    if (!mr) {
+        return 0;
+    }
+
+    return memory_region_size(mr);
 }
 
 static const TypeInfo memory_device_info = {