linux-kernel - Re: [PATCH 0/4]: Resolve MSI vs. INTX

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Date:	Wed, 24 Oct 2007 12:52:07 -0400 (EDT)
From:	Daniel Barkalow <barkalow@...ervon.org>
To:	David Miller <davem@...emloft.net>
cc:	linux-kernel@...r.kernel.org, jeff@...zik.org,
	linas@...tin.ibm.com, chunhao.huang@...mail.com, gregkh@...e.de,
	htejun@...il.com, brice.goglin@...il.com,
	david.gaarenstroom@...il.com, linux-pci@...ey.karlin.mff.cuni.cz,
	shane.huang@....com, linux-ide@...r.kernel.org, brice@...i.com,
	mchan@...adcom.com
Subject: Re: [PATCH 0/4]: Resolve MSI vs. INTX_DISABLE quirks.

On Tue, 23 Oct 2007, David Miller wrote:

> From: Daniel Barkalow <barkalow@...ervon.org>
> Date: Wed, 24 Oct 2007 00:58:45 -0400 (EDT)
> 
> > I'm not sure all of the pci_intx() calls in msi.c should be skipped when 
> > the quirk applies; I think some of them might be there so that the legacy 
> > interrupt won't be delivered while MSI is turned off (since the handler 
> > isn't listening for the legacy interrupts). I'd guess this would cause 
> > people to have their MSI-capable device kill their non-MSI-capable device 
> > when they restore their laptop (and the shared interrupt fires and gets 
> > stuck at just the wrong time). No idea if this is a real concern, but I'm 
> > pretty sure that not all of those calls are recent.
> 
> I don't think it's a real concern.

Okay, good. As long as someone more clueful than me has thought about it, 
because I couldn't tell off hand.

> > There's a couple of ATA drivers that look like they might be trying to 
> > work around the same bug, but it's a bit hard to tell. It might be good to 
> > have them use the quirk (or set the flag) because it's cleaner.
> 
> I noticed these cases as well, and I would hope that Jeff would help
> out here using the infrastructure my patches created.

Or coordinate with someone with the quirky hardware, yes.

	-Daniel
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