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

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Message-Id: <20130305.143940.1976678289652676624.davem@davemloft.net>
Date:	Tue, 05 Mar 2013 14:39:40 -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 12:01:06 +0100

> I left that "if (port->start == NULL)" in sunhv in place because it
> behaves completely differently. It checks port->start on all paths prior
> dereferencing it. And it does not stop interrupts on ->shutdown.

But this code really does care if a TTY is attached, because it wants
to make sure that SYSRQ handling occurs unconditionally, even if there
is no TTY to queue the characters to.

This is critically important during bootup before the initial shell
is spawned, if you want to do a SYSRQ register dump or reset out of
a hung boot.

Whether that test is now ->state == NULL or whatever, the same logic
still needs to exist in all of these places.
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