linux-kernel - Re: [PATCH v5 28/44] tty: Remove ldsem recursion support

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Date:	Mon, 18 Mar 2013 20:01:01 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, Sasha Levin <levinsasha928@...il.com>,
	Dave Jones <davej@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Shawn Guo <shawn.guo@...aro.org>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH v5 28/44] tty: Remove ldsem recursion support

On Mon, 2013-03-18 at 16:59 -0700, Greg Kroah-Hartman wrote:
> On Mon, Mar 11, 2013 at 04:44:48PM -0400, Peter Hurley wrote:
> > Read lock recursion is no longer required for ldisc references;
> > remove mechanism.
> > 
> > Signed-off-by: Peter Hurley <peter@...leysoftware.com>
> > ---
> >  drivers/tty/tty_ldsem.c   | 83 +++++------------------------------------------
> >  include/linux/tty_ldisc.h |  2 --
> >  2 files changed, 8 insertions(+), 77 deletions(-)
> 
> Wait, why did you add something 3 patches ago, only to remove it here?
> Why not just smush these patches together in the first place?

>From [PATCH v5 00/44] ldisc patchset...

On Mon, 2013-03-11 at 16:44 -0400, Peter Hurley wrote: 
> v5 changes:
> 
> After completing an audit of the recursive use of ldisc
> references, I discovered the _blocking_ recursive acquisition
> of ldisc references was limited to line disciplines misusing
> the tty_perform_flush() function.
> With that now resolved in,
>   'tty: Fix recursive deadlock in tty_perform_flush()'
> the recursion design in ldsem has been removed.
> 
> The recursion removal is in its own patch,
>   'tty: Remove ldsem recursion support'
> to ease review for those that have already reviewed the
> ldsem implementation.

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