Re: gspca, what do I am wrong?

[Thomas Kaiser <linux-dvb@kaiser-linux.li>]

Hans de Goede wrote:
> Thomas Kaiser wrote:
>> Hello Jean-Francois
>>
>> I got some time and I would like to test the new gspca V2 v4l2 driver 
>> but with this issues I will get up soon :-(
>>
>> I have about 20 webcams laying around which I would like to test with 
>> the new gspca V2 "in kernel" drive with a "stock distribution 
>> (Ubuntu)" kernel.
>>
> 
> Please don't give up we would really like to have you onboard, you did a 
> greta job with the gspcav1 pixart drivers and I'm sure you will make a 
> valuable contributor!
> 
> The problem is that gspca now is part of the v4l-dvb tree, so when you 
> build it now you rebuild the entire v4l subsystem really, this means 
> that you must make sure that all v4l modules, including videodev.ko are 
> unloaded before trying to modprobe for example gspca_pac207, so that the 
> new version of videodev.ko gets loaded.
> 
> This has been working fine for me both with older and newer kernels (on 
> Fedora), so if you are really sure no old modules are loaded, it might 
> be there is something funny / weird going on with the way your 
> distribution provides kernel sources for building out of tree modules 
> (as Thierry hints at).
> 
> To give you an idea, here is how I test gspca:
> 
> --- begin test.sh ---
> #!/bin/bash
> 
> set -e
> 
> make
> sudo make install
> 
> sudo rmmod gspca_sonixb || :
> sudo rmmod gspca_spca501 || :
> sudo rmmod gspca_spca561 || :
> sudo rmmod gspca_pac207 || :
> sudo rmmod gspca_pac7311 || :
> sudo rmmod gspca_ov519 || :
> sudo rmmod gspca_zc3xx || :
> sudo rmmod gspca_main || :
> sudo rmmod tuner || :
> sudo rmmod msp3400 || :
> sudo rmmod bttv || :
> sudo rmmod compat_ioctl32 || :
> sudo rmmod videodev || :
> sudo rmmod v4l1_compat || :
> sudo rmmod ir_common || :
> 
> sudo modprobe gspca_main debug=15
> sudo modprobe gspca_sonixb
> sudo modprobe gspca_spca501
> sudo modprobe gspca_spca561
> sudo modprobe gspca_pac207
> sudo modprobe gspca_pac7311
> sudo modprobe gspca_ov519
> sudo modprobe gspca_zc3xx
> sudo modprobe bttv
> --- end test.sh ---
> 
> Regards,
> 
> Hans
> 

Hello Hans

I didn't gave up, yet ;-)

Recently, there was a kernel upgrade for Ubuntu. I updated and built the 
v4l-dvb tree new, without doing a "make install". After that I insmoded 
the needed modules (videodev, gspac_main, gspca_....) by hand and the 
cam worked :-)

After that I check the kernel log and found "Unknown symbol" from gspca 
again! But now I recognized that these errors are coming from the old 
gspca module which ubuntu tried to load as I plugged the cam.

I blacklist the gspca module, did a "make install", rebooted, plugged 
the cam and it was working with the new gspca module. No "Unknown 
symbol" messages anymore in the kernel log :-)

But I still don't know why it did not work before. Anyway I am happy at 
the moment :-)

Thomas



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