[01/22] console: QLIST-ify display change listeners.

diff --git a/console.h b/console.h
index 6099d8d..4239eb3 100644
--- a/console.h
+++ b/console.h
@@ -164,7 +164,7 @@  struct DisplayChangeListener {
                      int w, int h, uint32_t c);
     void (*dpy_text_cursor)(struct DisplayState *s, int x, int y);
 
-    struct DisplayChangeListener *next;
+    QLIST_ENTRY(DisplayChangeListener) next;
 };
 
 struct DisplayAllocator {
@@ -179,7 +179,7 @@  struct DisplayState {
     struct QEMUTimer *gui_timer;
 
     struct DisplayAllocator* allocator;
-    struct DisplayChangeListener* listeners;
+    QLIST_HEAD(, DisplayChangeListener) listeners;
 
     void (*mouse_set)(int x, int y, int on);
     void (*cursor_define)(QEMUCursor *cursor);
@@ -231,72 +231,76 @@  static inline int is_buffer_shared(DisplaySurface *surface)
 
 static inline void register_displaychangelistener(DisplayState *ds, DisplayChangeListener *dcl)
 {
-    dcl->next = ds->listeners;
-    ds->listeners = dcl;
+    QLIST_INSERT_HEAD(&ds->listeners, dcl, next);
 }
 
 static inline void dpy_update(DisplayState *s, int x, int y, int w, int h)
 {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
         dcl->dpy_update(s, x, y, w, h);
-        dcl = dcl->next;
     }
 }
 
 static inline void dpy_resize(DisplayState *s)
 {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
         dcl->dpy_resize(s);
-        dcl = dcl->next;
     }
 }
 
 static inline void dpy_setdata(DisplayState *s)
 {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
-        if (dcl->dpy_setdata) dcl->dpy_setdata(s);
-        dcl = dcl->next;
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
+        if (dcl->dpy_setdata) {
+            dcl->dpy_setdata(s);
+        }
     }
 }
 
 static inline void dpy_refresh(DisplayState *s)
 {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
-        if (dcl->dpy_refresh) dcl->dpy_refresh(s);
-        dcl = dcl->next;
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
+        if (dcl->dpy_refresh) {
+            dcl->dpy_refresh(s);
+        }
     }
 }
 
 static inline void dpy_copy(struct DisplayState *s, int src_x, int src_y,
-                             int dst_x, int dst_y, int w, int h) {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
-        if (dcl->dpy_copy)
+                             int dst_x, int dst_y, int w, int h)
+{
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
+        if (dcl->dpy_copy) {
             dcl->dpy_copy(s, src_x, src_y, dst_x, dst_y, w, h);
-        else /* TODO */
+        } else { /* TODO */
             dcl->dpy_update(s, dst_x, dst_y, w, h);
-        dcl = dcl->next;
+        }
     }
 }
 
 static inline void dpy_fill(struct DisplayState *s, int x, int y,
-                             int w, int h, uint32_t c) {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
-        if (dcl->dpy_fill) dcl->dpy_fill(s, x, y, w, h, c);
-        dcl = dcl->next;
+                             int w, int h, uint32_t c)
+{
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
+        if (dcl->dpy_fill) {
+            dcl->dpy_fill(s, x, y, w, h, c);
+        }
     }
 }
 
-static inline void dpy_cursor(struct DisplayState *s, int x, int y) {
-    struct DisplayChangeListener *dcl = s->listeners;
-    while (dcl != NULL) {
-        if (dcl->dpy_text_cursor) dcl->dpy_text_cursor(s, x, y);
-        dcl = dcl->next;
+static inline void dpy_cursor(struct DisplayState *s, int x, int y)
+{
+    struct DisplayChangeListener *dcl;
+    QLIST_FOREACH(dcl, &s->listeners, next) {
+        if (dcl->dpy_text_cursor) {
+            dcl->dpy_text_cursor(s, x, y);
+        }
     }
 }
 
diff --git a/hw/xenfb.c b/hw/xenfb.c
index 338800a..ef24c33 100644
--- a/hw/xenfb.c
+++ b/hw/xenfb.c
@@ -717,7 +717,7 @@  static void xenfb_update(void *opaque)
 	if (xenfb_queue_full(xenfb))
 	    return;
 
-        for (l = xenfb->c.ds->listeners; l != NULL; l = l->next) {
+        QLIST_FOREACH(l, &xenfb->c.ds->listeners, next) {
             if (l->idle)
                 continue;
             idle = 0;
diff --git a/vl.c b/vl.c
index 5513d15..427e8a2 100644
--- a/vl.c
+++ b/vl.c
@@ -1359,15 +1359,14 @@  static void gui_update(void *opaque)
 {
     uint64_t interval = GUI_REFRESH_INTERVAL;
     DisplayState *ds = opaque;
-    DisplayChangeListener *dcl = ds->listeners;
+    DisplayChangeListener *dcl;
 
     dpy_refresh(ds);
 
-    while (dcl != NULL) {
+    QLIST_FOREACH(dcl, &ds->listeners, next) {
         if (dcl->gui_timer_interval &&
             dcl->gui_timer_interval < interval)
             interval = dcl->gui_timer_interval;
-        dcl = dcl->next;
     }
     qemu_mod_timer(ds->gui_timer, interval + qemu_get_clock_ms(rt_clock));
 }
@@ -3846,14 +3845,12 @@  int main(int argc, char **argv, char **envp)
 
     /* display setup */
     dpy_resize(ds);
-    dcl = ds->listeners;
-    while (dcl != NULL) {
+    QLIST_FOREACH(dcl, &ds->listeners, next) {
         if (dcl->dpy_refresh != NULL) {
             ds->gui_timer = qemu_new_timer_ms(rt_clock, gui_update, ds);
             qemu_mod_timer(ds->gui_timer, qemu_get_clock_ms(rt_clock));
             break;
         }
-        dcl = dcl->next;
     }
     text_consoles_set_display(ds);