linux-kernel - Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Date:	Wed, 15 Nov 2006 11:31:04 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...l.org, jeff@...zik.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

At Tue, 14 Nov 2006 19:21:17 -0800 (PST),
David Miller wrote:
> 
> From: Linus Torvalds <torvalds@...l.org>
> Date: Tue, 14 Nov 2006 19:10:42 -0800 (PST)
> 
> > Yours was still an example of "nice". And it had absolutely nothing
> > to do with the _PROBLEM_.
> 
> Understood.
> 
> BTW, some drivers have taken the approch to add MSI self-tests
> inside of the driver to ensure correct option of MSI on a given
> machine.  There's a lot of resistence to that, the reasons for
> which I grok fully, but I'm not sure other suggestions such as
> black lists are any better.

The snd-hda-intel driver has a test of MSI, but it seems not working
on every machine.  It caused non-cared interrupts and the kernel
disabled that irq.

> Given current experience maybe white-lists are in fact the way
> to go.

Could it be whitelisted in the PCI driver side?  I don't think it's
good to have a huge white/blacklist in each device driver.


Takashi
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