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Date: Thu, 12 Mar 2009 18:09:55 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Markus Armbruster <armbru@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
       "xen-devel\@lists.xensource.com" <xen-devel@lists.xensource.com>,
       Ian Jackson <Ian.Jackson@eu.citrix.com>,
       Anders Kaseorg <andersk@MIT.EDU>, Jeremy Fitzhardinge <jeremy@goop.org>,
       Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] IRQ handling race and spurious IIR read in
 serial/8250.c
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> Ian Jackson recently debugged a problem reported by Anders Kaseorg, and
> posted a fix (see http://lkml.org/lkml/2009/2/11/240).  As far as I can
> see, the patch has been dropped on the floor.

It was proposed as a band aid fix not a real fix. The real fix involves
finishing sorting out any locking issues Ian identified. I've not seen a
patch for that yet.

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] IRQ handling race and spurious IIR read in
 serial/8250.c
Date: Thu, 12 Mar 2009 18:09:55 +0000
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To: Markus Armbruster <armbru@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Ian, Jackson <Ian.Jackson@eu.citrix.com>, linux-kernel@vger.kernel.org, Anders Kaseorg <andersk@MIT.EDU>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, linux-serial@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
List-Id: linux-serial@vger.kernel.org

> Ian Jackson recently debugged a problem reported by Anders Kaseorg, and
> posted a fix (see http://lkml.org/lkml/2009/2/11/240).  As far as I can
> see, the patch has been dropped on the floor.

It was proposed as a band aid fix not a real fix. The real fix involves
finishing sorting out any locking issues Ian identified. I've not seen a
patch for that yet.