qbus: register reset handler for qbus whose parent is NULL

Stefan Weil reported the regression caused by
ec990eb622ad46df5ddcb1e94c418c271894d416 as follows

> The second regression also occurs with MIPS malta.
> Networking no longer works with the default pcnet nic.
>
> This is caused because the reset function for pcnet is no
> longer called during system boot. The result in an invalid
> mac address (all zero) and a non-working nic.
>
> For this second regression I still have no simple solution.
> Of course mips_malta.c should be converted to qdev which
> would fix both problems (but only for malta system emulation).

The issue is, it is assumed that all qbuses, qdeves are under
main_system_bus. But there are qbuses whose parent is NULL. So it
is necessary to trigger reset for those qbuses.
(On the other hand, if NULL is passed to qdev_create(), its parent bus
is main_system_bus.)
Ideally those buses should be moved under bus controller
device which is qdev. But it's not done yet.
So register qbus reset handler for qbus whose parent is NULL.

Reported-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: "Michael S. Tsirkin" <mst@redhat.com>
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/vl.c b/vl.c
index c4d3fc0d3d..8d6bab4032 100644
--- a/vl.c
+++ b/vl.c
@@ -3088,7 +3088,9 @@ int main(int argc, char **argv, char **envp)
         exit(1);
     }
 
-    qemu_register_reset((void *)qbus_reset_all, sysbus_get_default());
+    /* TODO: once all bus devices are qdevified, this should be done
+     * when bus is created by qdev.c */
+    qemu_register_reset(qbus_reset_all_fn, sysbus_get_default());
     qemu_run_machine_init_done_notifiers();
 
     qemu_system_reset();