linux-kernel - Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt responses)

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Message-ID: <alpine.LNX.2.00.1303182301450.9529@pobox.suse.cz>
Date:	Mon, 18 Mar 2013 23:04:21 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Harald Arnesen <skogtun.linux@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Peter Hurley <peter@...leysoftware.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Thomas Meyer <thomas@...3r.de>,
	Shawn Starr <shawn.starr@...ers.com>,
	USB list <linux-usb@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org, Daniel Vetter <daniel.vetter@...ll.ch>,
	Imre Deak <imre.deak@...el.com>,
	Daniel Kurtz <djkurtz@...omium.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [3.9-rc1] irq 16: nobody cared (was [3.9-rc1] very poor interrupt
 responses)

On Mon, 18 Mar 2013, Daniel Vetter wrote:

> Yep, there's a big comment in the irq handler for that chipset that we
> have a gaping race with when using MSI interrupts. Although the comment
> bodly claims that the race is small enough to avoid the dreaded "nobody
> cared" message. Looks like gmbus is good at hitting that race - on newer
> chips it already brought up a similar race in handling pch interrupts.

I see ... will target my focus in that direction, thanks.

> Can you please give the below patch a whirl? It removes the probably race
> msi race avoidance code and replaces it with the same trick Paulo used to
> fix pch irq handling races.

Unfortunately it didn't change anything, the spurious interrupt report is 
still there.

-- 
Jiri Kosina
SUSE Labs
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