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To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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       Michal Piotrowski <michal.k.k.piotrowski@gmail.com>,
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Subject: Re: [2/4] 2.6.22-rc3: known regressions
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From: Roland Dreier <rdreier@cisco.com>
Date: Thu, 31 May 2007 16:17:00 -0700
In-Reply-To: <alpine.LFD.0.98.0705311610440.26602@woody.linux-foundation.org> (Linus Torvalds's message of "Thu, 31 May 2007 16:12:02 -0700 (PDT)")
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What about the changes to fix the order that MSI-X irqs are returned
in (iirc, list_add had to be changed to list_add_tail in a couple of
places).  Without that change, multiple MSI-X interrupts seem to be
broken: the kernel programs the MSI-X table in the opposite order that
it gives the irq numbers to the driver.  The net effect is that if I
request, say, 3 MSI-X interrupts for a device, then when the device
generates the first interrupt, the driver thinks it generated the
third interrupt, and things go fairly haywire.

 - R.