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

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Date:	Wed, 15 Nov 2006 13:30:34 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Linus Torvalds <torvalds@...l.org>
CC:	Roland Dreier <rdreier@...co.com>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

Linus Torvalds wrote:
> The spec is just so much toilet paper. The ONLY thing that matters is what 
> real hardware does. So please please please PLEASE don't start quoting 
> specs as a way to "prove your point". It is totally meaningless.

Amen.


> End result: I think that at least for 2.6.19, and at least for the HDA 
> sound driver, keeping it disabled by default is the right choice. We 
> should probably _also_ make "pci_msi_supported()" just return an error 
> (probably by just clearing "pci_msi_enable") for any non-intel host bridge 
> for now.

If you update, pci_msi_{enable,supported} then you can -- and should -- 
revert the HD-audio driver change.  Just reviewed the driver, and it 
properly checks all the return values from PCI MSI API functions.

(though, HD-audio shouldn't be using IRQF_DISABLED at all, and shouldn't 
be using IRQF_SHARED for PCI MSI interrupts)

Though maybe for 2.6.19 the current state of things is at least a stable 
state.

	Jeff


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