hw/misc: make pvpanic known to user

This patch is based on Hu Tao's:
http://lists.nongnu.org/archive/html/qemu-devel/2013-08/msg00125.html

The pvpanic device may be enabled now with "-device pvpanic"
from command line.
Signed-off-by: NMarcel Apfelbaum <marcel.a@redhat.com>
Reviewed-by: NHu Tao <hutao@cn.fujitsu.com>
Message-id: 1376233843-19410-3-git-send-email-marcel.a@redhat.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/misc/pvpanic.c

@@ -97,29 +97,24 @@ static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
 {
     ISADevice *d = ISA_DEVICE(dev);
     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
+    FWCfgState *fw_cfg = fw_cfg_find();
+    uint16_t *pvpanic_port;
 
-    isa_register_ioport(d, &s->io, s->ioport);
-}
+    if (!fw_cfg) {
+        return;
+    }
 
-static void pvpanic_fw_cfg(ISADevice *dev, FWCfgState *fw_cfg)
-{
-    PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
-    uint16_t *pvpanic_port = g_malloc(sizeof(*pvpanic_port));
+    pvpanic_port = g_malloc(sizeof(*pvpanic_port));
     *pvpanic_port = cpu_to_le16(s->ioport);
-
     fw_cfg_add_file(fw_cfg, "etc/pvpanic-port", pvpanic_port,
                     sizeof(*pvpanic_port));
+
+    isa_register_ioport(d, &s->io, s->ioport);
 }
 
 void pvpanic_init(ISABus *bus)
 {
-    ISADevice *dev;
-    FWCfgState *fw_cfg = fw_cfg_find();
-    if (!fw_cfg) {
-        return;
-    }
-    dev = isa_create_simple (bus, TYPE_ISA_PVPANIC_DEVICE);
-    pvpanic_fw_cfg(dev, fw_cfg);
+    isa_create_simple(bus, TYPE_ISA_PVPANIC_DEVICE);
 }
 
 static Property pvpanic_isa_properties[] = {
@@ -132,8 +127,8 @@ static void pvpanic_isa_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = pvpanic_isa_realizefn;
-    dc->no_user = 1;
     dc->props = pvpanic_isa_properties;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 }
 
 static TypeInfo pvpanic_isa_info = {