linux-kernel - Re: [RFC PATCH arm: initial TI-Nspire support]

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Message-ID: <op.wu8ng3wyu7prd4@fabians-laptop.fritz.box>
Date:	Mon, 08 Apr 2013 22:06:29 +0200
From:	"Fabian Vogt" <fabian@...ter-vogt.de>
To:	"Arnd Bergmann" <arnd@...db.de>
Cc:	"Daniel Tang" <dt.tangr@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	"Lionel Debroux" <lionel_debroux@...oo.fr>,
	linux-kernel@...r.kernel.org,
	"Linus Walleij" <linus.walleij@...aro.org>
Subject: Re: [RFC PATCH arm: initial TI-Nspire support]

> On Monday 08 April 2013, Fabian Vogt wrote:
>> The latest kernel it seems to get stuck at
>> console_lock() in do_register_framebuffer (drivers/video/fbmem.c:1655)
>> if the LCD-controller is enabled. (Early printk and serial console works
>> fine)
>> CONFIG_NO_HZ is not activated, it works completely.
>> Could this be a kernel bug or is this an issue with our timer
>> configuration?
>
> This usually happens when the console driver or anything it uses
> calls a function that does a printk(), which means you get a recursive
> call into the console code and try to get the same lock again.
Yes, I've heard that before, but than it would work/not work independently
of NO_HZ. Can printk's be executet within console_lock() ..  
console_unlock() blocks?
If not, it could be fb_notifier_call_chain, too, but that wouldn't be  
likely at all.
I also tried spinlock/mutex debugging and soft lockup detection,
but neither of them outputs anything.
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