Hello,
some persons are reporting -ENOSPC errors from usb_submit_urb() in the
sn9c102 driver for some unkown reasons. I can't reproduce this bug, although
I tested and compiled the driver against the same version of the kernel used
by one of the above users (default kubuntu 2.6.20-15-generic namely).
Everything is working fine on my machine, so for now I can't give you further
details about this issue. I suspect there have been some changes in the USB
internals affecting usb_submit_urb(). Is this the reason in your opinion?
Below is another bug report. The latest version of the sn9c102 used in these
tests is available at http://www.linux-projects.org or included in
2.6.21-mm2.
Best regards
Luca
---------- Forwarded Message ----------
Subject: sn9c102 vs 2.6.21 problems
Date: sabato 12 maggio 2007
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
I have a Chicony DC-2110 webcam. It was chosen to avoid the need for
external linux drivers. Thank you for your contribution to the linux
community by making a lot of webcam owners happy around the world.
However unfortunately things sometimes go wrong, and I want to report an
error here. My webcam have been working fine using Ekiga and sonic-snap
until a recent kernel upgrade.
I'm using the Hardened favour of Gentoo Linux. First I wasn't sure if the
hardening features (PaX, grsecurity) may interfere with the driver, but
after I've got exactly the same error messages using a vanilla kernel from
kernel.org it was clear that it's not related to these special security
additions.
The symptom is, that previously functioning v4l2 programs fail to handle
or even find the device.
1. the kernel log says:
***
May 11 03:03:36 hostname usb 3-1: new full speed USB device using uhci_hcd
and address 4
May 11 03:03:36 hostname usb 3-1: configuration #1 chosen from 1 choice
May 11 03:03:36 hostname usb 3-1: SN9C10[12] PC Camera Controller detected
(vid/pid 0x0C45:0x600D)
May 11 03:03:36 hostname usb 3-1: PAS106B image sensor detected
May 11 03:03:36 hostname usb 3-1: Initialization succeeded
May 11 03:03:36 hostname usb 3-1: V4L2 device registered as /dev/video0
May 11 03:03:36 hostname usb 3-1: Optional device control through 'sysfs'
interface ready
May 11 03:04:31 hostname usb 3-1: usb_submit_urb() failed, error -28
***
It repeats the last line as many times I try to access the device by any
program.
2. sonic-snap fails like this:
***
sonic-snap-gui
Cannot open '/dev/video0': 28, No space left on device
***
3. Ekiga even won't find the webcam.
I have a basic knowledge of the kernel, and it's clear, that the driver
calls this function pretty clearly. I also suspect, that the data transfer
completely fails. I've noticed, that with 2.6.21, a version bump happened
regarding sn9c102, with a couple of new features. I reverted the driver to
the previous version, and even after this I couldn't get it to work.
It seems to me, that some changes were introduced in the USB layer with
the advent of 2.6.21 blocking this driver to function correctly.
I assume, that I'm not the only one with this complain. I hope, that I've
found the right person, and I'll try to do my best to help you to fix this
issue. Do you have any webcams failing with vanilla 2.6.21?
Please let me know, what should I do next.
Regards,
Attila
--
dr Tóth Attila, Radiológus Szakorvos jelölt, 06-20-825-8057, 06-30-5962-962
Attila Toth MD, Radiologist in Training, +36-20-825-8057, +36-30-5962-962
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