linux-kernel - Re: Nobody cared about IRQs at shutdown

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Message-ID: <4CEE8B67.2050701@gmail.com>
Date:	Thu, 25 Nov 2010 21:14:31 +0500
From:	"Alexander E. Patrakov" <patrakov@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: Nobody cared about IRQs at shutdown

25.11.2010 21:06, Alan Stern wrote:
> On Thu, 25 Nov 2010, Alexander E. Patrakov wrote:
>
>> Hello.
>>
>> After switching my Gentoo desktop from sysvinit + openrc to systemd, I
>> started getting "nobody cared" messages about IRQs 16 and 19 (common
>> thing: they are assigned to the USB controllers, that's why CC:
> According to your listing, they are used by uhci-hcd.  Do the messages
> go away if you unload uhci-hcd before shutting down?

It is not a module here, so I have to recompile the kernel in order to 
try this. Will do that tomorrow.

> You may need to debug the uhci-hcd driver. Look into
> drivers/usb/host/uhci-hcd.c; the uhci_shutdown() routine ought to be
> called and it ought to call uhci_hc_died(), which in turn calls
> uhci_reset_hc() in pci-quirks.c, which is supposed to prevent the
> controller from generating any IRQs.

OK, tomorrow I will add some printks there.

> Do you have any USB devices attached to bus 3 or bus 6?

Yes:

Bus 006 Device 002: ID 05d8:4002 Ultima Electronics Corp. Artec Ultima 
2000 (GT6801 based)/Lifetec LT9385/ScanMagic 1200 UB Plus Scanner

Should I unplug it and retest the bug now?

-- 
Alexander E. Patrakov
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