This removes the need for using monitor_is_qmp() to check the
subclass type, which is an anti-pattern.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 monitor/hmp.c              | 16 ++++++++++++++++
 monitor/monitor-internal.h |  5 +++++
 monitor/monitor.c          | 12 +++---------
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index f9252387c4..4636165d0b 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -70,6 +70,7 @@ static void monitor_hmp_set_readline(Object *obj, bool val, Error **errp)
 
 int monitor_hmp_vprintf(Monitor *mon, const char *fmt, va_list ap)
     G_GNUC_PRINTF(2, 0);
+static void monitor_hmp_accept_input(Monitor *mon);
 
 static void monitor_hmp_class_init(ObjectClass *cls, const void *data)
 {
@@ -80,6 +81,7 @@ static void monitor_hmp_class_init(ObjectClass *cls, const void *data)
                                    monitor_hmp_set_readline);
 
     moncls->vprintf = monitor_hmp_vprintf;
+    moncls->accept_input = monitor_hmp_accept_input;
 }
 
 static void monitor_hmp_init(Object *obj)
@@ -100,6 +102,20 @@ int monitor_hmp_vprintf(Monitor *mon, const char *fmt, va_list ap)
     return monitor_puts(mon, buf);
 }
 
+static void monitor_hmp_accept_input(Monitor *mon)
+{
+    qemu_mutex_lock(&mon->mon_lock);
+    if (mon->reset_seen) {
+        MonitorHMP *hmp = MONITOR_HMP(mon);
+        assert(hmp->rs);
+        readline_restart(hmp->rs);
+        qemu_mutex_unlock(&mon->mon_lock);
+        readline_show_prompt(hmp->rs);
+    } else {
+        qemu_mutex_unlock(&mon->mon_lock);
+    }
+}
+
 static void monitor_command_cb(void *opaque, const char *cmdline,
                                void *readline_opaque)
 {
diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
index 763b5c9625..592f146331 100644
--- a/monitor/monitor-internal.h
+++ b/monitor/monitor-internal.h
@@ -116,6 +116,11 @@ struct MonitorClass {
      * notifications back to the client
      */
     void (*emit_event)(Monitor *mon, QAPIEvent event, QDict *qdict);
+    /*
+     * If non-NULL, perform any actions needed to prepare
+     * the monitor to accept further client input
+     */
+    void (*accept_input)(Monitor *mon);
 };
 
 struct Monitor {
diff --git a/monitor/monitor.c b/monitor/monitor.c
index 90cfb59c66..6e63e7a5c7 100644
--- a/monitor/monitor.c
+++ b/monitor/monitor.c
@@ -578,16 +578,10 @@ int monitor_suspend(Monitor *mon)
 static void monitor_accept_input(void *opaque)
 {
     Monitor *mon = opaque;
+    MonitorClass *cls = MONITOR_GET_CLASS(mon);
 
-    qemu_mutex_lock(&mon->mon_lock);
-    if (!monitor_is_qmp(mon) && mon->reset_seen) {
-        MonitorHMP *hmp_mon = container_of(mon, MonitorHMP, parent_obj);
-        assert(hmp_mon->rs);
-        readline_restart(hmp_mon->rs);
-        qemu_mutex_unlock(&mon->mon_lock);
-        readline_show_prompt(hmp_mon->rs);
-    } else {
-        qemu_mutex_unlock(&mon->mon_lock);
+    if (cls->accept_input) {
+        cls->accept_input(mon);
     }
 
     qemu_chr_fe_accept_input(&mon->chr);
-- 
2.55.0