From: Chuck Ebbert <cebbert@redhat.com>
To: Mitch Williams <mitch.a.williams@intel.com>
Cc: gregkh@suse.de, linux-kernel@vger.kernel.org, auke-jan.h.kok@intel.com
Subject: Re: [PATCH 2.6.21-rc5] MSI: read-flush MSI-X table (rev 2)
Date: Thu, 29 Mar 2007 13:25:34 -0400 [thread overview]
Message-ID: <460BF68E.9030806@redhat.com> (raw)
In-Reply-To: <1175186462.21369.4.camel@strongmad>
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@intel.com>
>
Are you going to post one for 2.6.20 as well? Some people might be
interested...
next prev parent reply other threads:[~2007-03-29 17:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-29 16:41 [PATCH 2.6.21-rc5] MSI: read-flush MSI-X table (rev 2) Mitch Williams
2007-03-29 16:59 ` Eric W. Biederman
2007-03-29 22:01 ` Williams, Mitch A
2007-03-29 17:25 ` Chuck Ebbert [this message]
2007-03-29 17:31 ` Randy Dunlap
2007-03-29 22:05 ` Williams, Mitch A
2007-03-29 22:14 ` Chuck Ebbert
2007-03-30 5:02 ` Eric W. Biederman
2007-03-30 5:03 ` Eric W. Biederman
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