[linux-dvb] dvb v4l code break webcam drivers

jon bird news at onastick.clara.co.uk
Tue Jun 23 21:33:10 CEST 2009


I replaced my stock Linux V4l/dvb drivers with the versions from cvs on 
linuxtv.org whilst attempting to resolve problems with my Nova-T stick 
(a red herring as it happens). However what I've discovered since is 
that they argue quite badly with drivers for the 2 webcams I have (of 
course the webcam drivers themselves may be at fault here but I thought 
it worth pointing out....).

Replacing the linux kernel modules (2.6.26) resolves the problem and 
both these and the DVB side work.

here's the log from the snapshot I took 2 days ago:

Jun 22 17:17:55 fridge kernel: ------------[ cut here ]------------
Jun 22 17:17:55 fridge kernel: WARNING: at 
/opt2/data/kernel/v4l-dvb-6c50c4b2ef70/v4l/v4l2-dev.c:434 
video_register_device_index+0x3a/0x354 [videodev]()
Jun 22 17:17:55 fridge kernel: Modules linked in: gspca(+) videodev 
v4l1_compat af_packet nfsd exportfs usbserial ppdev parport_pc lp 
parport snd_pcm_oss snd_mixer_oss snd_via82xx snd_ac97_codec ac97_bus 
snd_pcm snd_timer snd_page_alloc snd_mpu401_uart snd_rawmidi 
snd_seq_device snd soundcore xt_TCPMSS xt_DSCP ipt_MASQUERADE ipt_LOG 
ipt_REDIRECT xt_state joydev evdev dvb_usb_dib0700 dib7000p dib7000m 
dvb_usb dvb_core firmware_class dib3000mc dibx000_common dib0070 
uhci_hcd ohci_hcd ehci_hcd usbcore ipv6 8139too mii ipt_REJECT 
iptable_mangle iptable_nat nf_nat iptable_filter nf_conntrack_ipv4 
nf_conntrack ip_tables mt2060 i2c_core sata_via libata dock 8250 
serial_core
Jun 22 17:17:55 fridge kernel: Pid: 3853, comm: modprobe Not tainted 
2.6.26 #9
Jun 22 17:17:55 fridge kernel:  [warn_on_slowpath+62/91] 
warn_on_slowpath+0x3e/0x5b
Jun 22 17:17:55 fridge kernel:  [<c0117690>] warn_on_slowpath+0x3e/0x5b
Jun 22 17:17:55 fridge kernel:  [__wake_up+15/21] __wake_up+0xf/0x15
Jun 22 17:17:55 fridge kernel:  [<c0114aa9>] __wake_up+0xf/0x15
Jun 22 17:17:55 fridge kernel:  [wake_up_klogd+43/45] 
wake_up_klogd+0x2b/0x2d
Jun 22 17:17:55 fridge kernel:  [<c0118109>] wake_up_klogd+0x2b/0x2d
Jun 22 17:17:55 fridge kernel:  [<f8982405>] 
usb_internal_control_msg+0x54/0x61 [usbcore]
Jun 22 17:17:55 fridge kernel:  [<f8982490>] usb_control_msg+0x7e/0x8b 
[usbcore]
Jun 22 17:17:55 fridge kernel:  [printk+14/17] printk+0xe/0x11
Jun 22 17:17:55 fridge kernel:  [<c0117cdc>] printk+0xe/0x11
Jun 22 17:17:55 fridge kernel:  [<f8ca5a6d>] 
spca5xx_getcapability+0xa2/0xad [gspca]
Jun 22 17:17:55 fridge kernel:  [<f8c353ae>] 
video_register_device_index+0x3a/0x354 [videodev]
Jun 22 17:17:55 fridge kernel:  [<f8c35372>] 
video_register_device+0x7/0x9 [videodev]
Jun 22 17:17:55 fridge kernel:  [<f8caa441>] spca5xx_probe+0x1f4/0x287 
[gspca]
Jun 22 17:17:55 fridge kernel:  [<f8983b95>] 
usb_probe_interface+0xb3/0xde [usbcore]
Jun 22 17:17:55 fridge kernel:  [__driver_attach+0/85] 
__driver_attach+0x0/0x55
Jun 22 17:17:55 fridge kernel:  [<c0227384>] __driver_attach+0x0/0x55
Jun 22 17:17:55 fridge kernel:  [really_probe+112/226] 
really_probe+0x70/0xe2
Jun 22 17:17:55 fridge kernel:  [<c022725d>] really_probe+0x70/0xe2
Jun 22 17:17:55 fridge kernel:  [driver_probe_device+54/62] 
driver_probe_device+0x36/0x3e
Jun 22 17:17:55 fridge kernel:  [<c022731a>] 
driver_probe_device+0x36/0x3e
Jun 22 17:17:55 fridge kernel:  [__driver_attach+55/85] 
__driver_attach+0x37/0x55
Jun 22 17:17:55 fridge kernel:  [<c02273bb>] __driver_attach+0x37/0x55
Jun 22 17:17:55 fridge kernel:  [bus_for_each_dev+53/89] 
bus_for_each_dev+0x35/0x59
Jun 22 17:17:55 fridge kernel:  [<c02267b6>] bus_for_each_dev+0x35/0x59
Jun 22 17:17:55 fridge kernel:  [driver_attach+17/19] 
driver_attach+0x11/0x13
Jun 22 17:17:55 fridge kernel:  [<c02273ea>] driver_attach+0x11/0x13
Jun 22 17:17:55 fridge kernel:  [__driver_attach+0/85] 
__driver_attach+0x0/0x55
Jun 22 17:17:55 fridge kernel:  [<c0227384>] __driver_attach+0x0/0x55
Jun 22 17:17:55 fridge kernel:  [bus_add_driver+138/306] 
bus_add_driver+0x8a/0x132
Jun 22 17:17:55 fridge kernel:  [<c0226cf4>] bus_add_driver+0x8a/0x132
Jun 22 17:17:55 fridge kernel:  [driver_register+104/136] 
driver_register+0x68/0x88
Jun 22 17:17:55 fridge kernel:  [<c0227716>] driver_register+0x68/0x88
Jun 22 17:17:55 fridge kernel:  [<f898409b>] 
usb_register_driver+0x52/0x9c [usbcore]
Jun 22 17:17:55 fridge kernel:  [<f8b37014>] usb_spca5xx_init+0x14/0x31 
[gspca]
Jun 22 17:17:55 fridge kernel:  [<c0131660>] sys_init_module+0x84/0x173
Jun 22 17:17:55 fridge kernel:  [syscall_call+7/11] syscall_call+0x7/0xb
Jun 22 17:17:55 fridge kernel:  [<c0102a22>] syscall_call+0x7/0xb
Jun 22 17:17:55 fridge kernel:  =======================
Jun 22 17:17:55 fridge kernel: ---[ end trace be190c3dbfd1c67f ]---


this happens with the spca5xx webcam driver and the old Logitech 
quickcam express driver.


-- 
== jon bird - software engineer
== <reply to address _may_ be invalid, real mail below>
== <reduce rsi, stop using the shift key>
== posted as: news 'at' onastick 'dot' clara.co.uk




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