linux-kernel - Re: [PATCH 2.6.21-rc5] MSI: read-flush MSI-X table (rev 2)

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Message-ID: <460BF68E.9030806@redhat.com>
Date:	Thu, 29 Mar 2007 13:25:34 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Mitch Williams <mitch.a.williams@...el.com>
CC:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	auke-jan.h.kok@...el.com
Subject: Re: [PATCH 2.6.21-rc5] MSI: read-flush MSI-X table (rev 2)

Mitch Williams wrote:
> This patch fixes a kernel bug which is triggered when using the
> irqbalance daemon with MSI-X hardware.
> 
> Because both MSI-X interrupt messages and MSI-X table writes are posted,
> it's possible for them to cross while in-flight.  This results in
> interrupts being received long after the kernel thinks they're disabled,
> and in interrupts being sent to stale vectors after rebalancing.
> 
> This patch performs a read flush after writes to the MSI-X table for
> mask/unmask and rebalancing operations.
> 
> This patch has been validated with (unreleased) network hardware which
> uses MSI-X.
> 
> Revised with input from Eric Biederman.
> 
> Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
> 

Are you going to post one for 2.6.20 as well? Some people might be
interested...


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