linux-kernel - Re: Device hang when offlining a CPU due to IRQ misrouting

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Message-ID: <20070619005136.GF9751@tree.beaverton.ibm.com>
Date:	Mon, 18 Jun 2007 17:51:36 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com
Subject: Re: Device hang when offlining a CPU due to IRQ misrouting

On Mon, Jun 18, 2007 at 04:54:34PM -0700, Siddha, Suresh B wrote:

> > <call to set_affinity>
> > [  256.298787] irq=4341 affinity=d
> > <ethernet on irq 4341 stops working>
> 
> And just to make sure, at this point, your MSI irq 4341 affinity
> (/proc/irq/4341/smp_affinity) still points to '2'?

Actually, it's 0xD.  From the kernel's perspective the mask has been
updated (and I even stuck a printk into set_msi_irq_affinity to verify
that the writes are happening) but ... the hardware doesn't seem to
reflect this.  I also tried putting read_msi_msg right afterwards to
compare contents, though it complained about all the MSIs _except_ for
4341.  (Of course, I could just be way off on the effectiveness of
that.)

--D

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