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

From: Chris Wright
Date: Thu Nov 30 2006 - 20:14:16 EST


* Linus Torvalds (torvalds@xxxxxxxx) 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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/