linux-kernel - Re: [RESEND] [PATCH] RTC: assure proper memory ordering with respect to RTC_DEV_BUSY flag (was Re: RTC: convert mutex to bitfield)

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Message-ID: <20071202231322.2c104d8c@i1501.lan.towertech.it>
Date:	Sun, 2 Dec 2007 23:13:22 +0100
From:	Alessandro Zummo <alessandro.zummo@...ertech.it>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	David Brownell <david-b@...bell.net>,
	Nickk Piggin <nickpiggin@...oo.com.au>,
	linux-kernel@...r.kernel.org
Subject: Re: [RESEND] [PATCH] RTC: assure proper memory ordering with
 respect to RTC_DEV_BUSY flag (was Re: RTC: convert mutex to bitfield)

On Sun, 2 Dec 2007 23:00:04 +0100 (CET)
Jiri Kosina <jkosina@...e.cz> wrote:

> [ nobody seems to have picked this up, resending. This is a fix for 
>   commit 8853c202b4 in Linus' tree ]
> 
> From: Jiri Kosina <jkosina@...e.cz>
> 
> RTC: assure proper memory ordering with respect to RTC_DEV_BUSY flag
> 
> We must make sure that the RTC_DEV_BUSY flag has proper lock semantics, 
> i.e. that the RTC_DEV_BUSY stores clearing the flag don't get reordered 
> before the preceeding stores and loads and vice versa.
> 
> Spotted by Nick Piggin.
> 
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

 missed it, sorry.

 
 Acked-by: Alessandro Zummo <a.zummo@...ertech.it>

-- 

 Best regards,

 Alessandro Zummo,
  Tower Technologies - Torino, Italy

  http://www.towertech.it

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