linux-kernel - Re: [2/4] 2.6.22-rc3: known regressions

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Message-ID: <adalkf4oa6r.fsf@cisco.com>
Date:	Thu, 31 May 2007 16:17:00 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Mike Miller (OS Dev)" <mikem@...rdog.cca.cpqcorp.net>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [2/4] 2.6.22-rc3: known regressions

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.
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