fbcon: Silence fbcon logo on 'quiet' boots

On text-based systems the 'quiet' boot option will show printk levels
higher than CONSOLE_LOGLEVEL_QUIET.  The displaying of the Tux logo
during boot can cause some consoles to lose display data and as a result
confuse the end user.

Do not display the Tux logo on systems that are in 'quiet' boot.

v2: It helps to commit all my changes before sending them.  Remove extra
bracket.
v3: buildbot error fix: fbcon can be built as part of a module so export console_printk
v4: move console_printk change to separate patch, and drop logo cleanup
v5: Only set FBCON_LOGO_DONTSHOW for console loglevel

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Marko Myllynen <myllynen@redhat.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Yisheng Xie <ysxie@foxmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c
index fd430e6..cd059a8 100644 (file)
--- a/drivers/video/fbdev/core/fbcon.c
+++ b/drivers/video/fbdev/core/fbcon.c
@@ -656,11 +656,14 @@ static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
                kfree(save);
        }
 
+       if (logo_shown == FBCON_LOGO_DONTSHOW)
+               return;
+
        if (logo_lines > vc->vc_bottom) {
                logo_shown = FBCON_LOGO_CANSHOW;
                printk(KERN_INFO
                       "fbcon_init: disable boot-logo (boot-logo bigger than screen).\n");
-       } else if (logo_shown != FBCON_LOGO_DONTSHOW) {
+       } else {
                logo_shown = FBCON_LOGO_DRAW;
                vc->vc_top = logo_lines;
        }
@@ -1066,6 +1069,9 @@ static void fbcon_init(struct vc_data *vc, int init)
 
        cap = info->flags;
 
+       if (console_loglevel <= CONSOLE_LOGLEVEL_QUIET)
+               logo_shown = FBCON_LOGO_DONTSHOW;
+
        if (vc != svc || logo_shown == FBCON_LOGO_DONTSHOW ||
            (info->fix.type == FB_TYPE_TEXT))
                logo = 0;