linux-kernel - Re: WARNING at tty_buffer.c:428 process_one

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Date:	Tue, 05 Mar 2013 15:33:58 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	jslaby@...e.cz
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: WARNING at tty_buffer.c:428 process_one_work()

From: Jiri Slaby <jslaby@...e.cz>
Date: Tue, 05 Mar 2013 21:27:59 +0100

> On 03/05/2013 09:03 PM, David Miller wrote:
>> From: Jiri Slaby <jslaby@...e.cz>
>> Date: Tue, 05 Mar 2013 20:44:49 +0100
>> 
>>> Hi, I must admit I don't understand. I now checked both of them and they
>>> call uart_handle_sysrq_char unconditionally, or?
>> 
>> Nope, in the sunsab.c receive function, we used to handle the SYSRQ
>> stuff before break checking when TTY is NULL, now we don't.
> 
> But how could tty be NULL in there? subsab enables interrupts after the
> TTY is open and disables before it is closed/hupped. So the tty couldn't
> be NULL there, right?

TTY is NULL until bootup and SYSRQ works perfectly fine during this
time when sunsab is the console, which via sunsab_console_setup()
invokes sunsab_startup() which requests the IRQ.
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