linux-kernel - Re: video: USB webcam fails since kernel 3.2

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Message-ID: <20120617171138.GK12429@burratino>
Date:	Sun, 17 Jun 2012 12:11:38 -0500
From:	Jonathan Nieder <jrnieder@...il.com>
To:	Martin-Éric Racine <martin-eric.racine@....fi>
Cc:	Jean-François Moine <moinejf@...e.fr>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: video: USB webcam fails since kernel 3.2

(cc-ing Hans de Goede, the new gspca maintainer.  Sorry I missed that before.)

>> Martin-Éric Racine wrote:
>>> usb 1-7: new high-speed USB device number 3 using ehci_hcd
[...]
>>> usb 1-7: Product: USB2.0 Web Camera
>>> usb 1-7: Manufacturer: Vimicro Corp.
[...]
>>> gspca_main: v2.14.0 registered
>>> gspca_main: vc032x-2.14.0 probing 0ac8:0321
[...]
>>> gspca_main: ISOC data error: [36] len=0, status=-71
>>> gspca_main: ISOC data error: [65] len=0, status=-71
[...]
>>> gspca_main: ISOC data error: [48] len=0, status=-71
>>> video_source:sr[3246]: segfault at 0 ip   (null) sp ab36de1c error 14 in cheese[8048000+21000]
>>> gspca_main: ISOC data error: [17] len=0, status=-71

Thanks again.

If you get a chance to test Hans's media-for_v3.5 branch, that would
be interesting.  It works like so:

 0. prerequisites:

	apt-get install git build-essential

 1. get the kernel history, if you don't already have it:

	git clone \
	  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. fetch gspca updates:

	cd linux
	git remote add gspca \
	  git://linuxtv.org/hgoede/gspca.git
	git fetch gspca

 3. configure, build, test:

	git checkout gspca/media-for_v3.5
	cp /boot/config-$(uname -r) .config; # current configuration
	scripts/config --disable DEBUG_INFO
	make localmodconfig; # optional: minimize configuration
	make deb-pkg; # optionally with -j<num> for parallel build
	dpkg -i ../<name of package>; # as root
	reboot
	... test test test ...

I ask because there have been some gspca core fixes cooking that are
not part of the 3.4.y tree, though none of them looks especially
relevant.

Hope that helps,
Jonathan
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