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

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Message-Id: <20130301.170056.382924644594872197.davem@davemloft.net>
Date:	Fri, 01 Mar 2013 17:00:56 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, jslaby@...e.cz
Subject: Re: WARNING at tty_buffer.c:428 process_one_work()

From: David Miller <davem@...emloft.net>
Date: Fri, 01 Mar 2013 16:47:11 -0500 (EST)

> 
> I'm getting these non-stop right when the hypervisor console registers
> on sparc64, and the machine won't boot up properly.  This is with
> Linus's current tree.

As a quick addendum I'm looking at all of these tty_insert_flip_char()
conversions and I'm extremely disappointed.

Let's just look at just two of the sparc drivers converted in commit
92a19f9cec9a80ad93c06e115822deb729e2c6ad, namely sunhv.c and sunsab.c.

The changes to the uart_handle_sysrq_char() call sites are handled
completely differently in these two drivers, in nearly identical
situations.  How can this be correct?

In the sunhv.c case the uart_handle_sysrq_char() call is preserved
but the guarding test is changed from:

	if (tty == NULL)

into

	if (port->start == NULL)

Whereas in the sunsab.c case, the entire guarding test as well as
the uart_handle_sysrq_char() invocation itself are both
completly removed.

How in the world can that be right?

Either the receive_chars() method's invocations of
uart_handle_sysrq_char() should be retained, or this sysrq processing
is handled now elsewhere and in which case that should be documented
clearly and in detail in the commit log message.
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