linux-kernel - Re: [PATCH] Disable INTx when enabling MSI in forcedeth

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Message-ID: <4563C775.8020004@garzik.org>
Date:	Tue, 21 Nov 2006 22:43:49 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Linus Torvalds <torvalds@...l.org>
CC:	Daniel Barkalow <barkalow@...ervon.org>,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Roland Dreier <rdreier@...co.com>,
	Ayaz Abdulla <aabdulla@...dia.com>
Subject: Re: [PATCH] Disable INTx when enabling MSI in forcedeth

Linus Torvalds wrote:
> 
> On Tue, 21 Nov 2006, Daniel Barkalow wrote:
>> My nVidia ethernet card doesn't disable its own INTx when MSI is
>> enabled. This causes a steady stream of spurious interrupts that
>> eventually kills my SATA IRQ if MSI is used with forcedeth, which is
>> true by default. Simply disabling the INTx interrupt takes care of it.
>>
>> This is against -stable, and would be suitable once someone who knows the 
>> code verifies that it's correct.
> 
> I _really_ think that we should do this in pci_msi_enable().
> 
> Screw cards that are not PCI-2.3 compliant - just make the rule be that if 
> you use MSI, you _have_ to allow us to set the disable-INTx bit. It's then 
> up to the drivers to decide if they can use MSI or not.
> 
> (Even a number of cards that are not PCI-2.3 may simply not _implement_ 
> the disable-INTx bit, and in that case, they can use MSI if they disable 
> INTx automatically - the ).
> 
> Comments?

I agree.  And it's just a simple matter of remove the PCI-Express 
brackets AFAICS, like in the attached patch (untested).

	Jeff




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