linux-kernel - Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

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Date:	Fri, 25 May 2007 09:17:35 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Greg KH <gregkh@...e.de>
Cc:	Jay Cliburn <jacliburn@...lsouth.net>,
	Grzegorz Krzystek <ninex@...eX.eu.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...e.de>, ninex@...pl,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	Michael Ellerman <michael@...erman.id.au>,
	David Miller <davem@...emloft.net>,
	Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH 1/2] msi: Invert the sense of the MSI enables.

Greg KH <gregkh@...e.de> writes:

> Originally I would have thought this would be a good idea, but now that
> Vista is out, which supports MSI, I don't think we are going to need
> this in the future.  All new chipsets should support MSI fine and this
> table will only grow in the future, while the blacklist should not need
> to have many new entries added to it.
>
> So I don't think this is a good idea, sorry.

- The current situation is broken
- In spec hardware does not require MSI to generate interrupts
  Which leaves enabling MSI optional.

Do you have a better idea to solve the current brokenness?

MSI appears to have enough problems that enabling it in a kernel
that is supposed to run lots of different hardware (like a distro
kernel) is a recipe for disaster.

Eric
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