linux-kernel - Re: [PATCH 0/2] fixes for empty tx buffer breakage

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Date:	Thu, 10 Jul 2014 16:14:32 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	Seth Bollinger <sethb@...i.com>,
	Aaro Koskinen <aaro.koskinen@....fi>,
	Sam Ravnborg <sam@...nborg.org>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: Re: [PATCH 0/2] fixes for empty tx buffer breakage

On Sun, Jul 06, 2014 at 11:29:51AM -0400, Peter Hurley wrote:
> Cc: Seth Bollinger <sethb@...i.com>
> Cc: Aaro Koskinen <aaro.koskinen@....fi>
> Cc: Sam Ravnborg <sam@...nborg.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
> 
> Greg,
> 
> I completed the audit of serial drivers after reports that
> several Sun serial drivers were broken by
> commit 717f3bbab3c7628736ef738fdbf3d9a28578c26c,
> 'serial_core: Fix conditional start_tx on ring buffer not empty'.
> 
> I apologize for not submitting this sooner. The delay was due to
> an ongoing analysis of serial flow control prompted by Sam Ravnborg's
> question:
> 
> On 06/10/2014 03:24 PM, Sam Ravnborg wrote:
> > I also noticed the typical pattern is:
> > 
> >      if (uart_circ_empty(xmit) || uart_tx_stopped(port))
> > 
> > Should you use this pattern also in sunsab.c?
> 
> Unfortunately, that analysis revealed that tx flow control is
> largely SMP-unsafe, and it's fairly easy to corrupt the hardware
> state wrt. the tty flow control state.
> 
> I'm still working on the solutions to that; they're too
> extensive to submit for 3.16 anyway.

So these should go into 3.16-final?  Or 3.17?

confused,

greg k-h
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