linux-kernel - Re: [PATCH tty-next] n_tty: Fix termios

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Date:	Mon, 12 Aug 2013 08:53:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jiri Slaby <jslaby@...e.cz>,
	Belisko Marek <marek.belisko@...il.com>
Subject: Re: [PATCH tty-next] n_tty: Fix termios_rwsem lockdep false positive

On Mon, Aug 12, 2013 at 09:39:01AM -0400, Peter Hurley wrote:
> On 08/12/2013 09:19 AM, Sergey Senozhatsky wrote:
> >On (08/12/13 08:55), Peter Hurley wrote:
> >>>>>[..]
> >>>>>  drivers/tty/n_tty.c | 25 +++++++++++--------------
> >>>>>  1 file changed, 11 insertions(+), 14 deletions(-)
> >>>>>
> >>>
> >>>I hate to do this, but isn't it actually my patch posted here
> >>>https://lkml.org/lkml/2013/8/1/510
> >>>
> >>>which was tagged as `wrong'?
> >>
> >>Sergey,
> >>
> >>My apologies; I was mistaken regarding this problem being a lockdep
> >>regression (although it's still a false positive from lockdep). Once
> >>I had worked around some issues with the nouveau driver, I was able to
> >>reproduce the lockdep report on 3.10.
> >>
> >no problem.
> >
> >>I included Artem's lockdep report in the changelog because I received
> >>that first, on 30 July.
> >>
> >>My patch below is not the same as your patch of 1 Aug. This patch
> >>preserves the protected access of termios.c_cc[VMIN] and termios.c_cc[VTIME]
> >>(via the MIN_CHAR() and TIME_CHAR() macros).
> >
> >fair enough. v3 was protecting VMIN/VTIME (my bad, I noticed this a bit later),
> >but I didn't submit it since v2 did not get positive response.
> >
> >>If you'd prefer, I could add to changelog:
> >>
> >>    Patch based on original posted here https://lkml.org/lkml/2013/8/1/510
> >>    by Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> >
> >if you don't mind, that would be great.
> 
> Ok.
> 
> Greg,
> Should I re-spin a v2 to include the note above
> (or can you add it with Artem's Tested-by)?

I'll add it, no need to resend.

greg k-h
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