char: update the mux handlers in class callback

Instead of handling mux chardev in a special way in
qemu_chr_fe_set_handlers(), we may use the chr_update_read_handler
class callback instead.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190206174328.9736-2-marcandre.lureau@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

chardev/char-fe.c

@@ -290,10 +290,6 @@ void qemu_chr_fe_set_handlers_full(CharBackend *b,
             qemu_chr_be_event(s, CHR_EVENT_OPENED);
         }
     }
-
-    if (CHARDEV_IS_MUX(s)) {
-        mux_chr_set_handlers(s, context);
-    }
 }
 
 void qemu_chr_fe_set_handlers(CharBackend *b,

chardev/char-mux.c

@@ -278,7 +278,7 @@ static void char_mux_finalize(Object *obj)
     qemu_chr_fe_deinit(&d->chr, false);
 }
 
-void mux_chr_set_handlers(Chardev *chr, GMainContext *context)
+static void mux_chr_update_read_handlers(Chardev *chr)
 {
     MuxChardev *d = MUX_CHARDEV(chr);
 
@@ -289,7 +289,7 @@ void mux_chr_set_handlers(Chardev *chr, GMainContext *context)
                                   mux_chr_event,
                                   NULL,
                                   chr,
-                                  context, true, false);
+                                  chr->gcontext, true, false);
 }
 
 void mux_set_focus(Chardev *chr, int focus)
@@ -383,6 +383,7 @@ static void char_mux_class_init(ObjectClass *oc, void *data)
     cc->chr_add_watch = mux_chr_add_watch;
     cc->chr_be_event = mux_chr_be_event;
     cc->chr_machine_done = open_muxes;
+    cc->chr_update_read_handler = mux_chr_update_read_handlers;
 }
 
 static const TypeInfo char_mux_type_info = {

include/chardev/char-mux.h

@@ -55,7 +55,6 @@ typedef struct MuxChardev {
 #define CHARDEV_IS_MUX(chr)                             \
     object_dynamic_cast(OBJECT(chr), TYPE_CHARDEV_MUX)
 
-void mux_chr_set_handlers(Chardev *chr, GMainContext *context);
 void mux_set_focus(Chardev *chr, int focus);
 void mux_chr_send_all_event(Chardev *chr, int event);