linux-kernel - Re: BUG: pty.c in linux 2.6.31-rc5+

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Message-ID: <20110804143733.GC18468@kroah.com>
Date:	Thu, 4 Aug 2011 07:37:33 -0700
From:	Greg KH <greg@...ah.com>
To:	"MRU.Ilya" <utdilya@...l.ru>
Cc:	stable@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: BUG: pty.c  in linux 2.6.31-rc5+

On Thu, Aug 04, 2011 at 10:46:43AM +0400, MRU.Ilya wrote:
> Synchronic's line disciplines(ppp_synctty, hdlc) can't work with
> pseudo terminals.
> 
> If frames send very fast from one side(master/slave) to other one,
> frames merge in one (merge point "flip buffer") and the other side
> can read only one big frame.
> But sync line discipline need one frame in one read.
> 
> For push one frame to ldisc I propose small patch, but this regression for
> commit e043e42bdb66885b3ac10d27a01ccb9972e2b0a3.
> 
> I don't find any mutexes and other things forbidden in not user context,
> in function flush_to_ldisc() , and I think this patch
> is true and this function can called from any context. But I not sure.
> 
> Relative commit  86d23a057e718f73adc15e463c643d6e014a19cd.
> 
> 

> --- orig/pty.c	2011-07-13 07:29:43.000000000 +0400
> +++ work/pty.c	2011-08-03 20:59:01.000000000 +0400
> @@ -204,6 +204,7 @@
>  	clear_bit(TTY_OTHER_CLOSED, &tty->link->flags);
>  	set_bit(TTY_THROTTLED, &tty->flags);
>  	retval = 0;
> +	tty->low_latency = 1;

I really don't think this is correct.

Also, you forgot to read Documentation/SubmittingPatches for how to
properly format and send a patch and who to send it to...

thanks,

greg k-h
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