pvpanic: initialization cleanup

Avoid use of static variables: PC systems
initialize pvpanic device through pvpanic_init,
so we can simply create the fw_cfg file at that point.
This also makes it possible to skip device
creation completely if fw_cfg is not there, e.g. for xen -
so the ports it reserves are not discoverable by guests.

Also, make pvpanic_init void since callers ignore return
status anyway.

Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Paul Durrant <Paul.Durrant@citrix.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 16 insertions, 14 deletions

diff --git a/hw/misc/pvpanic.c b/hw/misc/pvpanic.c
index 060099b553..83ed226081 100644
--- a/hw/misc/pvpanic.c
+++ b/hw/misc/pvpanic.c
@@ -97,26 +97,28 @@ static void pvpanic_isa_realizefn(DeviceState *dev, Error **errp)
 {
     ISADevice *d = ISA_DEVICE(dev);
     PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
-    static bool port_configured;
-    FWCfgState *fw_cfg;
 
     isa_register_ioport(d, &s->io, s->ioport);
+}
 
-    if (!port_configured) {
-        fw_cfg = fw_cfg_find();
-        if (fw_cfg) {
-            fw_cfg_add_file(fw_cfg, "etc/pvpanic-port",
-                            g_memdup(&s->ioport, sizeof(s->ioport)),
-                            sizeof(s->ioport));
-            port_configured = true;
-        }
-    }
+static void pvpanic_fw_cfg(ISADevice *dev, FWCfgState *fw_cfg)
+{
+    PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
+
+    fw_cfg_add_file(fw_cfg, "etc/pvpanic-port",
+                    g_memdup(&s->ioport, sizeof(s->ioport)),
+                    sizeof(s->ioport));
 }
 
-int pvpanic_init(ISABus *bus)
+void pvpanic_init(ISABus *bus)
 {
-    isa_create_simple(bus, TYPE_ISA_PVPANIC_DEVICE);
-    return 0;
+    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);
 }
 
 static Property pvpanic_isa_properties[] = {