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Subject[PATCH AUTOSEL 4.18 048/131] fbdev/core: Disable console-lock warnings when fb.lockless_register_fb is set
Date
From: Thomas Zimmermann <tzimmermann@suse.de>

[ Upstream commit 3f2ce54284a60500eb6dca1dca6fd615df8f9aa3 ]

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.

v3:
- manipulate ignore_console_lock_warning with atomic_{inc,dec}
v2:
- restore ignore_console_lock_warning if lock_fb_info() fails

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/video/fbdev/core/fbmem.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 609438d2465b..0b6a2d1eb5bb 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1691,17 +1691,22 @@ static int do_register_framebuffer(struct fb_info *fb_info)
event.info = fb_info;
if (!lockless_register_fb)
console_lock();
+ else
+ atomic_inc(&ignore_console_lock_warning);
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
+ atomic_dec(&ignore_console_lock_warning);
+ return ret;
}

static int do_unregister_framebuffer(struct fb_info *fb_info)
--
2.17.1
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