linux-kernel - Re: [PATCH v2] n_tty: Fix unordered accesses to lockless read buffer

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Date:	Fri, 16 Jan 2015 10:55:18 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Denis Du <dudenis2000@...oo.ca>,
	Måns Rullgård <mans@...sr.com>,
	Christian Riesch <christian.riesch@...cron.at>
Subject: Re: [PATCH v2] n_tty: Fix unordered accesses to lockless read buffer

On 01/12/2015 08:47 PM, Peter Hurley wrote:
> Add commit_head buffer index, which the producer-side publishes
> after input processing in non-canon mode. This ensures the consumer-side
> observes correctly-ordered writes in non-canonical mode (ie., the buffer
> data is written before the buffer index is advanced). Fix consumer-side
> uses of read_cnt() to use commit_head instead.
> 
> Add required memory barriers to the tail index to guarantee
> the consumer-side has completed the loads before the producer-side
> begins writing new data. Open-code the producer-side receive_room()
> into the i/o loop.

Hi Greg,

Please don't apply this. I've been testing a v3 series that I should be
able to get to you today.

Regards,
Peter Hurley

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