fbcon: Call fbcon_mode_deleted/new_modelist directly

I'm not entirely clear on what new_modelist actually does, it seems
exclusively for a sysfs interface. Which in the end does amount to a
normal fb_set_par to check the mode, but then takes a different path
in both fbmem.c and fbcon.c.

I have no idea why these 2 paths are different, but then I also don't
really want to find out. So just do the simple conversion to a direct
function call.

v2: static inline for the dummy versions, I forgot.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Peter Rosin <peda@axentia.se>
Cc: Yisheng Xie <ysxie@foxmail.com>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: linux-fbdev@vger.kernel.org
Link: https://patchwork.freedesktop.org/patch/msgid/20190528090304.9388-23-daniel.vetter@ffwll.ch

drivers/video/fbdev/core/fbcon.c

@@ -3019,7 +3019,7 @@ static void fbcon_set_all_vcs(struct fb_info *info)
 		fbcon_modechanged(info);
 }
 
-static int fbcon_mode_deleted(struct fb_info *info,
+int fbcon_mode_deleted(struct fb_info *info,
 		       struct fb_videomode *mode)
 {
 	struct fb_info *fb_info;
@@ -3262,7 +3262,7 @@ static void fbcon_fb_blanked(struct fb_info *info, int blank)
 	ops->blank_state = blank;
 }
 
-static void fbcon_new_modelist(struct fb_info *info)
+void fbcon_new_modelist(struct fb_info *info)
 {
 	int i;
 	struct vc_data *vc;
@@ -3324,7 +3324,6 @@ static int fbcon_event_notify(struct notifier_block *self,
 {
 	struct fb_event *event = data;
 	struct fb_info *info = event->info;
-	struct fb_videomode *mode;
 	struct fb_con2fbmap *con2fb;
 	struct fb_blit_caps *caps;
 	int idx, ret = 0;
@@ -3336,10 +3335,6 @@ static int fbcon_event_notify(struct notifier_block *self,
 	case FB_EVENT_MODE_CHANGE_ALL:
 		fbcon_set_all_vcs(info);
 		break;
-	case FB_EVENT_MODE_DELETE:
-		mode = event->data;
-		ret = fbcon_mode_deleted(info, mode);
-		break;
 	case FB_EVENT_SET_CONSOLE_MAP:
 		/* called with console lock held */
 		con2fb = event->data;
@@ -3353,9 +3348,6 @@ static int fbcon_event_notify(struct notifier_block *self,
 	case FB_EVENT_BLANK:
 		fbcon_fb_blanked(info, *(int *)event->data);
 		break;
-	case FB_EVENT_NEW_MODELIST:
-		fbcon_new_modelist(info);
-		break;
 	case FB_EVENT_GET_REQ:
 		caps = event->data;
 		fbcon_get_requirement(info, caps);

drivers/video/fbdev/core/fbmem.c

@@ -966,13 +966,8 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
 		/* make sure we don't delete the videomode of current var */
 		ret = fb_mode_is_equal(&mode1, &mode2);
 
-		if (!ret) {
-		    struct fb_event event;
-
-		    event.info = info;
-		    event.data = &mode1;
-		    ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event);
-		}
+		if (!ret)
+			fbcon_mode_deleted(info, &mode1);
 
 		if (!ret)
 			fb_delete_videomode(&mode1, &info->modelist);
@@ -1992,7 +1987,6 @@ subsys_initcall(fbmem_init);
 
 int fb_new_modelist(struct fb_info *info)
 {
-	struct fb_event event;
 	struct fb_var_screeninfo var = info->var;
 	struct list_head *pos, *n;
 	struct fb_modelist *modelist;
@@ -2012,14 +2006,12 @@ int fb_new_modelist(struct fb_info *info)
 		}
 	}
 
-	err = 1;
+	if (list_empty(&info->modelist))
+		return 1;
 
-	if (!list_empty(&info->modelist)) {
-		event.info = info;
-		err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
-	}
+	fbcon_new_modelist(info);
 
-	return err;
+	return 0;
 }
 
 MODULE_LICENSE("GPL");

include/linux/fb.h

@@ -126,8 +126,6 @@ struct fb_cursor_user {
 
 /*	The resolution of the passed in fb_info about to change */ 
 #define FB_EVENT_MODE_CHANGE		0x01
-/*      An entry from the modelist was removed */
-#define FB_EVENT_MODE_DELETE            0x04
 
 #ifdef CONFIG_GUMSTIX_AM200EPD
 /* only used by mach-pxa/am200epd.c */
@@ -142,9 +140,6 @@ struct fb_cursor_user {
 /*      A hardware display blank change occurred */
 #define FB_EVENT_BLANK                  0x09
 /*      Private modelist is to be replaced */
-#define FB_EVENT_NEW_MODELIST           0x0A
-/*	The resolution of the passed in fb_info about to change and
-        all vc's should be changed         */
 #define FB_EVENT_MODE_CHANGE_ALL	0x0B
 /*	A software display blank change occurred */
 #define FB_EVENT_CONBLANK               0x0C

include/linux/fbcon.h

@@ -9,6 +9,9 @@ void fbcon_fb_unregistered(struct fb_info *info);
 void fbcon_fb_unbind(struct fb_info *info);
 void fbcon_suspended(struct fb_info *info);
 void fbcon_resumed(struct fb_info *info);
+int fbcon_mode_deleted(struct fb_info *info,
+		       struct fb_videomode *mode);
+void fbcon_new_modelist(struct fb_info *info);
 #else
 static inline void fb_console_init(void) {}
 static inline void fb_console_exit(void) {}
@@ -17,6 +20,9 @@ static inline void fbcon_fb_unregistered(struct fb_info *info) {}
 static inline void fbcon_fb_unbind(struct fb_info *info) {}
 static inline void fbcon_suspended(struct fb_info *info) {}
 static inline void fbcon_resumed(struct fb_info *info) {}
+static inline int fbcon_mode_deleted(struct fb_info *info,
+				     struct fb_videomode *mode) { return 0; }
+static inline void fbcon_new_modelist(struct fb_info *info) {}
 #endif
 
 #endif /* _LINUX_FBCON_H */