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

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Date:	Mon, 10 Sep 2007 08:59:11 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Markus Armbruster <armbru@...hat.com>
cc:	linux-input@...ey.karlin.mff.cuni.cz, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Dmitry Torokhov <dtor@...l.ru>, akpm@...ux-foundation.org
Subject: Re: [PATCH] input: Fix interrupt enable in i8042_ctr when enabling
 interrupt fails


--
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.

Please apply.

-- Steve

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