[PATCH v2 1/1] fbdev/core: Disable console-lock warnings when fb.lockless_register_fb is set

[Thomas Zimmermann]

If the console is unlocked during registration, the console subsystem
generates significant amounts of warnings, which obfuscate actual
debugging messages. Setting ignore_console_lock_warning while debugging
console registration avoid the noise.

v2:
	- restore ignore_console_lock_warning if lock_fb_info() fails

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 drivers/video/fbdev/core/fbmem.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 9e2f9d3c760e..432c26eeabfb 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1627,6 +1627,7 @@ static int do_register_framebuffer(struct fb_info *fb_info)
 	int i, ret;
 	struct fb_event event;
 	struct fb_videomode mode;
+	bool saved_ignore_console_lock_warning = ignore_console_lock_warning;
 
 	if (fb_check_foreignness(fb_info))
 		return -ENOSYS;
@@ -1691,17 +1692,23 @@ static int do_register_framebuffer(struct fb_info *fb_info)
 	event.info = fb_info;
 	if (!lockless_register_fb)
 		console_lock();
+	else
+		ignore_console_lock_warning = true;
 	if (!lock_fb_info(fb_info)) {
-		if (!lockless_register_fb)
-			console_unlock();
-		return -ENODEV;
+		ret = -ENODEV;
+		goto unlock_console;
 	}
+	ret = 0;
 
 	fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
 	unlock_fb_info(fb_info);
+unlock_console:
 	if (!lockless_register_fb)
 		console_unlock();
-	return 0;
+	else
+		ignore_console_lock_warning =
+			saved_ignore_console_lock_warning;
+	return ret;
 }
 
 static int do_unregister_framebuffer(struct fb_info *fb_info)
-- 
2.18.0