linux-kernel - Re: [PATCH] drivers/isdn/gigaset: new M101 driver

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Message-ID: <45C72320.5040103@imap.cc>
Date:	Mon, 05 Feb 2007 13:29:20 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Karsten Keil <kkeil@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	i4ldeveloper@...tserv.isdn4linux.de, linux-serial@...r.kernel.org,
	Hansjoerg Lipp <hjlipp@....de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] drivers/isdn/gigaset: new M101 driver

Andrew Morton schrieb:
> On Mon, 05 Feb 2007 02:42:09 +0100 Tilman Schmidt <tilman@...p.cc> wrote:
> 
>> It's a pointer. Are reads and writes of pointer sized objects
>> guaranteed to be atomic on every platform?
> 
> Yup - we make the same assumption about longs in various places.
> 
> It's a bit strange to read a pointer which can be changing at the
> same time.  Because the local copy will no longer represent the
> thing which it was just copied from.

It's not that bad. The only possible concurrent change is from NULL
to non-NULL. Fearing an inconsistent read in that event was too
paranoid apparently.

Thanks for all your suggestions. I'll prepare a new patch based on
them.

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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