linux-kernel - Re: 3.4.4: disabling irq

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Date:	Sun, 15 Jul 2012 17:55:40 +0200
From:	Udo van den Heuvel <udovdh@...all.nl>
To:	linux-usb@...r.kernel.org
CC:	Alan Stern <stern@...land.harvard.edu>,
	Jan Ceuleers <jan.ceuleers@...puter.org>,
	Clemens Ladisch <clemens@...isch.de>,
	Simon Jones <sijones2010@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 3.4.4: disabling irq

On 2012-07-15 17:35, Alan Stern wrote:
> echo 0000:00:13.1 >/sys/bus/pci/drivers/ohci_hcd/unbind

Afterwards I did:

> echo 0000:00:13.1 >/sys/bus/pci/drivers/ohci_hcd/bind

And I saw:

Jul 15 17:50:30 surfplank2 kernel: ohci_hcd 0000:00:13.1: remove, state 1
Jul 15 17:50:30 surfplank2 kernel: usb usb4: USB disconnect, device number 1
Jul 15 17:50:30 surfplank2 kernel: usb 4-3: USB disconnect, device number 2
Jul 15 17:50:30 surfplank2 kernel: ohci_hcd 0000:00:13.1: USB bus 4
deregistered
Jul 15 17:50:37 surfplank2 kernel: ohci_hcd 0000:00:13.1: OHCI Host
Controller
Jul 15 17:50:37 surfplank2 kernel: ohci_hcd 0000:00:13.1: new USB bus
registered, assigned bus number 4
Jul 15 17:50:37 surfplank2 kernel: ohci_hcd 0000:00:13.1: irq 18, io mem
0xfe02a000
Jul 15 17:50:37 surfplank2 kernel: usb usb4: New USB device found,
idVendor=1d6b, idProduct=0001
Jul 15 17:50:37 surfplank2 kernel: usb usb4: New USB device strings:
Mfr=3, Product=2, SerialNumber=1
Jul 15 17:50:37 surfplank2 kernel: usb usb4: Product: OHCI Host Controller
Jul 15 17:50:37 surfplank2 kernel: usb usb4: Manufacturer: Linux 3.4.4
ohci_hcd
Jul 15 17:50:37 surfplank2 kernel: usb usb4: SerialNumber: 0000:00:13.1
Jul 15 17:50:37 surfplank2 kernel: hub 4-0:1.0: USB hub found
Jul 15 17:50:37 surfplank2 kernel: hub 4-0:1.0: 3 ports detected
Jul 15 17:50:37 surfplank2 kernel: usb 4-3: new full-speed USB device
number 2 using ohci_hcd
Jul 15 17:50:38 surfplank2 kernel: usb 4-3: New USB device found,
idVendor=0471, idProduct=0311
Jul 15 17:50:38 surfplank2 kernel: usb 4-3: New USB device strings:
Mfr=0, Product=0, SerialNumber=1
Jul 15 17:50:38 surfplank2 kernel: usb 4-3: SerialNumber: 01690000A5000000
Jul 15 17:50:38 surfplank2 mtp-probe: checking bus 4, device 2:
"/sys/devices/pci0000:00/0000:00:13.1/usb4/4-3"
Jul 15 17:50:38 surfplank2 mtp-probe: bus: 4, device: 2 was not an MTP
device
Jul 15 17:50:38 surfplank2 kernel: pwc: Philips PCVC740K (ToUCam
Pro)/PCVC840 (ToUCam II) USB webcam detected.
Jul 15 17:50:39 surfplank2 kernel: pwc: Registered as video0.
Jul 15 17:50:39 surfplank2 kernel: input: PWC snapshot button as
/devices/pci0000:00/0000:00:13.0/usb3/3-2/input/input8
Jul 15 17:50:39 surfplank2 kernel: pwc: Philips PCVC740K (ToUCam
Pro)/PCVC840 (ToUCam II) USB webcam detected.
Jul 15 17:50:39 surfplank2 kernel: pwc: Registered as video1.
Jul 15 17:50:39 surfplank2 kernel: input: PWC snapshot button as
/devices/pci0000:00/0000:00:13.1/usb4/4-3/input/input9
Jul 15 17:50:39 surfplank2 kernel: usbcore: registered new interface
driver Philips webcam
Jul 15 17:50:39 surfplank2 colord[3375]: (colord:3375): Cd-WARNING **:
CdMain: failed to emit DeviceAdded: failed to register object: An object
is already exported for the interface
org.freedesktop.ColorManager.Device at
/org/freedesktop/ColorManager/devices/sysfs_0471_0311

So I have two webcams on this controller, each on a different port.
The final line is an issue that cam with Fedora 17, nobody could foresee
that one could need a colord *and* have two identical webcams too. (I do
not need colord but have two webcams to be clear)

After doing this I could modprobe pwc and start mrtg without problem.

So now I can wait for the next occurrence.

Kind regards,
Udo

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