linux-kernel - Re: [PATCH] input: Fix interrupt enable in i8042

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Message-ID: <d120d5000709100614l7a4a651dl4baf64cee1414835@mail.gmail.com>
Date:	Mon, 10 Sep 2007 09:14:52 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Markus Armbruster" <armbru@...hat.com>
Cc:	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] input: Fix interrupt enable in i8042_ctr when enabling interrupt fails

Hi Steven, Markus,

On 9/10/07, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> --
> On Mon, 10 Sep 2007, Markus Armbruster wrote:
> >
> > I believe this possible, but unlikely (perhaps not so unlikely on
> > virtual machines).  Scenarios involve enable succeeding the first
> > time, failing the second time, and succeeding the third time.  I can
> > provide details, but the point I'd like to make is not that this is
> > broken (although it is, strictly speaking), but that it is not
> > obviously correct where it easily could be: just clear the interrupt
> > enable bits when writing them to the hardware failed, like the old
> > code did.
> >
>
> I also want to stress that this is more of a clean up for "technically
> correct" code than a bug fix.  This bug probably would never happen on
> baremetal unless it was running on broken hardware.
>
>  BUT!!!
>
> With more and more systems going to a virtual environment, having a bug or
> some other anomaly can trigger the error that this patch prevents. The
> patch will also trigger a print in the case of running on a buggy virtual
> machine, which would help out the developers of that virtual machine to
> fix their code.
>

The patch is in my tree and will be merged in the next window.

-- 
Dmitry
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