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

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Date:	Thu, 30 Nov 2006 17:16:57 -0800
From:	Chris Wright <chrisw@...s-sol.org>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Daniel Barkalow <barkalow@...ervon.org>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jeff@...zik.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 (torvalds@...l.org) 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 ).

Hmm, what do you recommend we do in the meantime, since it's a real
problem and the -stable tree has no fix?  Only issue I had with Daniel's
patch is that it's only half-tested.

thanks,
-chris
-
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