migration: Use normal VMStateDescriptions for Subsections

We create optional sections with this patch.  But we already have
optional subsections.  Instead of having two mechanism that do the
same, we can just generalize it.

For subsections we just change:

- Add a needed function to VMStateDescription
- Remove VMStateSubsection (after removal of the needed function
  it is just a VMStateDescription)
- Adjust the whole tree, moving the needed function to the corresponding
  VMStateDescription

Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 10 insertions, 12 deletions

diff --git a/hw/input/pckbd.c b/hw/input/pckbd.c
index 9b9a7d7..ddac69d 100644
--- a/hw/input/pckbd.c
+++ b/hw/input/pckbd.c
@@ -391,23 +391,24 @@ static int kbd_outport_post_load(void *opaque, int version_id)
     return 0;
 }
 
+static bool kbd_outport_needed(void *opaque)
+{
+    KBDState *s = opaque;
+    return s->outport != kbd_outport_default(s);
+}
+
 static const VMStateDescription vmstate_kbd_outport = {
     .name = "pckbd_outport",
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = kbd_outport_post_load,
+    .needed = kbd_outport_needed,
     .fields = (VMStateField[]) {
         VMSTATE_UINT8(outport, KBDState),
         VMSTATE_END_OF_LIST()
     }
 };
 
-static bool kbd_outport_needed(void *opaque)
-{
-    KBDState *s = opaque;
-    return s->outport != kbd_outport_default(s);
-}
-
 static int kbd_post_load(void *opaque, int version_id)
 {
     KBDState *s = opaque;
@@ -430,12 +431,9 @@ static const VMStateDescription vmstate_kbd = {
         VMSTATE_UINT8(pending, KBDState),
         VMSTATE_END_OF_LIST()
     },
-    .subsections = (VMStateSubsection[]) {
-        {
-            .vmsd = &vmstate_kbd_outport,
-            .needed = kbd_outport_needed,
-        },
-        VMSTATE_END_OF_LIST()
+    .subsections = (const VMStateDescription*[]) {
+        &vmstate_kbd_outport,
+        NULL
     }
 };