linux-kernel - Re: [PATCH 10/13] tty: untangle locking of wait_until

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Date:	Wed, 5 May 2010 20:59:05 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, Greg KH <gregkh@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Kacur <jkacur@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 10/13] tty: untangle locking of wait_until_sent

> Some wait_until_sent versions require the big
> tty mutex, others don't and some callers of
> wait_until_sent already hold it while other don't.
> That leads to recursive use of the BTM in these
> functions, which we're trying to get rid of.

I don't believe any of the currently live ones do.

>  drivers/char/amiserial.c      |    6 +++---
>  drivers/char/generic_serial.c |    2 +-

Both ex drivers

>  drivers/char/hvc_console.c    |    2 +-
>  drivers/char/hvcs.c           |    2 +-

Doesn't seemn to need it

>  drivers/char/ip2/ip2main.c    |   20 +++++++++++++++++---

I don't think we care - the driver is a mess, its probably not been used
in years

>  drivers/char/serial167.c      |    6 +++---

Historical value only and broken

>  drivers/char/specialix.c      |    2 +-

Broken

>  drivers/serial/68328serial.c  |    2 +-
>  drivers/serial/68360serial.c  |    5 ++---

Both defunct

>  drivers/serial/crisv10.c      |   12 +++++++-----

Defunct

>  net/irda/ircomm/ircomm_tty.c  |    2 +-

Semi-defunct at best

This makes me think that now might be a good time to consign the broken
crap to the bitbucket unless someone stands up with hardware and who
wants to maintain it.


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