Hi Daniel.

One detail I noticed while brosing the changes.

>  
> @@ -1064,9 +1062,13 @@ static void fbcon_init(struct vc_data *vc, int init)
>       int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256;
>       int cap, ret;
>  
> -     if (info_idx == -1 || info == NULL)
> +     if (WARN_ON(info_idx == -1))
>           return;
>  
> +     if (con2fb_map[vc->vc_num] == -1)
> +             con2fb_map[vc->vc_num] = info_idx;
> +
> +     info = registered_fb[con2fb_map[vc->vc_num]];
>       cap = info->flags;

When info is defined it is also assigned:
struct fb_info *info = registered_fb[con2fb_map[vc->vc_num]];

As the test for info is gone this assignment is no longer
requrired and can be deleted.

The code now assumes that there is always an fb_info if con2fb_map[]
is not set to -1. I could not determine if this is OK, but this
likely boils down to your locking concern of registered_fb.

        Sam

>  
>       if (logo_shown < 0 && console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
> @@ -3336,14 +3338,6 @@ static int fbcon_event_notify(struct notifier_block 
> *self,
>       struct fb_blit_caps *caps;
>       int idx, ret = 0;
>  
> -     /*
> -      * ignore all events except driver registration and deregistration
> -      * if fbcon is not active
> -      */
> -     if (fbcon_has_exited && !(action == FB_EVENT_FB_REGISTERED ||
> -                               action == FB_EVENT_FB_UNREGISTERED))
> -             goto done;
> -
>       switch(action) {
>       case FB_EVENT_SUSPEND:
>               fbcon_suspended(info);
> @@ -3396,7 +3390,6 @@ static int fbcon_event_notify(struct notifier_block 
> *self,
>               fbcon_remap_all(idx);
>               break;
>       }
> -done:
>       return ret;
>  }
>  
> @@ -3443,9 +3436,6 @@ static ssize_t store_rotate(struct device *device,
>       int rotate, idx;
>       char **last = NULL;
>  
> -     if (fbcon_has_exited)
> -             return count;
> -
>       console_lock();
>       idx = con2fb_map[fg_console];
>  
> @@ -3468,9 +3458,6 @@ static ssize_t store_rotate_all(struct device *device,
>       int rotate, idx;
>       char **last = NULL;
>  
> -     if (fbcon_has_exited)
> -             return count;
> -
>       console_lock();
>       idx = con2fb_map[fg_console];
>  
> @@ -3491,9 +3478,6 @@ static ssize_t show_rotate(struct device *device,
>       struct fb_info *info;
>       int rotate = 0, idx;
>  
> -     if (fbcon_has_exited)
> -             return 0;
> -
>       console_lock();
>       idx = con2fb_map[fg_console];
>  
> @@ -3514,9 +3498,6 @@ static ssize_t show_cursor_blink(struct device *device,
>       struct fbcon_ops *ops;
>       int idx, blink = -1;
>  
> -     if (fbcon_has_exited)
> -             return 0;
> -
>       console_lock();
>       idx = con2fb_map[fg_console];
>  
> @@ -3543,9 +3524,6 @@ static ssize_t store_cursor_blink(struct device *device,
>       int blink, idx;
>       char **last = NULL;
>  
> -     if (fbcon_has_exited)
> -             return count;
> -
>       console_lock();
>       idx = con2fb_map[fg_console];
>  
> @@ -3668,9 +3646,6 @@ static void fbcon_exit(void)
>       struct fb_info *info;
>       int i, j, mapped;
>  
> -     if (fbcon_has_exited)
> -             return;
> -
>  #ifdef CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER
>       if (deferred_takeover) {
>               dummycon_unregister_output_notifier(&fbcon_output_nb);
> @@ -3695,7 +3670,7 @@ static void fbcon_exit(void)
>               for (j = first_fb_vc; j <= last_fb_vc; j++) {
>                       if (con2fb_map[j] == i) {
>                               mapped = 1;
> -                             break;
> +                             con2fb_map[j] = -1;
>                       }
>               }
>  
> @@ -3718,8 +3693,6 @@ static void fbcon_exit(void)
>                               info->queue.func = NULL;
>               }
>       }
> -
> -     fbcon_has_exited = 1;
>  }
>  
>  void __init fb_console_init(void)
> -- 
> 2.20.1
> 
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