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From: Alan <alan@lxorguk.ukuu.org.uk>
To: "Jan Beulich" <jbeulich@novell.com>
Cc: <alan@redhat.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH, RFC] adjust legacy IDE resource setting
Date: Wed, 14 Feb 2007 15:40:14 +0000	[thread overview]
Message-ID: <20070214154014.7fa76711@localhost.localdomain> (raw)
In-Reply-To: <45D33344.76E4.0078.0@novell.com>

On Wed, 14 Feb 2007 15:05:24 +0000
"Jan Beulich" <jbeulich@novell.com> wrote:

> The change to force legacy mode IDE channels' resources to fixed
> non-zero values confuses (at least some versions of) X, because the
> values reported by the kernel and those readable from PCI config space
> aren't consistent anymore. Therefore, this patch arranges for the
> respective BARs to also get updated if possible.

If X is getting confused fix X. Those BARs are *undefined* in legacy
mode. The value in them is undefined, the results that end up there if
you do write to them are undefined too. If X believes those BAR values
blindly it'll do the wrong thing in some freaky cases.

Which specific versions of X are problematic ?

As to the implementation:
	start and end as passed are the real I/O values so you don't need
to mask them that I can see.

I've no fundamental problem with writing the BAR values back to avoid
confusing some apparently broken X, but I'd like to know what X, what
circumstances and that X is also getting fixed.

Alan

  reply	other threads:[~2007-02-14 15:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-14 15:05 Jan Beulich
2007-02-14 15:40 ` Alan [this message]
2007-02-14 15:46   ` Jan Beulich
2007-02-14 16:09     ` Alan
2007-03-07 18:10       ` Petri Kaukasoina

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