udev device nodes won't come back

udev device nodes won't come back

[Anthony DiSante]

Hello,

I'm running udev 030 on a Gentoo / 2.6.8 system, and I'm having some trouble 
with my tv tuner card.  While trying to get things working, I noticed that 
the /dev/v4l directory was only present when the bttv module was loaded. 
But at one point after a system lockup, /dev/v4l was there even though bttv 
was *not* loaded.

So I deleted /dev/v4l expecting it to be properly re-created when I loaded 
bttv... but that didn't happen.  How can I fix this?

Thanks,
Anthony DiSante
http://nodivisions.com/


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Re: udev device nodes won't come back

[Kay Sievers]

On Wed, 2004-09-29 at 03:10 -0400, Anthony DiSante wrote:
> Hello,
> 
> I'm running udev 030 on a Gentoo / 2.6.8 system, and I'm having some trouble 
> with my tv tuner card.  While trying to get things working, I noticed that 
> the /dev/v4l directory was only present when the bttv module was loaded. 
> But at one point after a system lockup, /dev/v4l was there even though bttv 
> was *not* loaded.
> 
> So I deleted /dev/v4l expecting it to be properly re-created when I loaded 
> bttv... but that didn't happen.  How can I fix this?

Does running /sbin/udevstart create the node?

What is in the db?
  [kay@pim ~]$ udevinfo -q all -p /sys/class/video4linux/video0
  P: /sys/class/video4linux/video0
  N: video0
  T: c
  M: 020660
  S: video
  O: root
  G: root
  F: /etc/udev/rules.d/50-udev.rules
  L: 33
  U: 45486

What does udevtest print?
  [kay@pim ~]$ udevtest /sys/class/video4linux/video0
  version 032
  looking at '/class/video4linux/video0'
  configured rule in '/etc/udev/rules.d/50-udev.rules' at line 33 applied, 'video0' becomes '%k'
  creating device node '/dev/video0', major = '81', minor = '0', mode = '020660', uid = '0', gid = '0'

How does the corresponding /sys-device entry look like?
  [kay@pim ~]$ tree /sys/class/video4linux/
  /sys/class/video4linux/
  `-- video0
      |-- bridge
      |-- brightness
      |-- contrast
      |-- custom_id
      |-- dev
      |-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb3/3-1
      |-- driver -> ../../../bus/usb/drivers/usb
      |-- exposure
      |-- hue
      |-- model
      |-- name
      |-- saturation
      `-- sensor

Good luck,
Kay



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Re: udev device nodes won't come back

[Anthony DiSante]

Kay Sievers wrote:
> Does running /sbin/udevstart create the node?
> 
> What is in the db?
>   [kay@pim ~]$ udevinfo -q all -p /sys/class/video4linux/video0
>   P: /sys/class/video4linux/video0
>   N: video0
>   T: c
>   M: 020660
>   S: video
>   O: root
>   G: root
>   F: /etc/udev/rules.d/50-udev.rules
>   L: 33
>   U: 45486
> 
> What does udevtest print?
>   [kay@pim ~]$ udevtest /sys/class/video4linux/video0
>   version 032
>   looking at '/class/video4linux/video0'
>   configured rule in '/etc/udev/rules.d/50-udev.rules' at line 33 applied, 'video0' becomes '%k'
>   creating device node '/dev/video0', major = '81', minor = '0', mode = '020660', uid = '0', gid = '0'
> 
> How does the corresponding /sys-device entry look like?
>   [kay@pim ~]$ tree /sys/class/video4linux/
>   /sys/class/video4linux/
>   `-- video0
>       |-- bridge
>       |-- brightness
>       |-- contrast
>       |-- custom_id
>       |-- dev
>       |-- device -> ../../../devices/pci0000:00/0000:00:1d.1/usb3/3-1
>       |-- driver -> ../../../bus/usb/drivers/usb
>       |-- exposure
>       |-- hue
>       |-- model
>       |-- name
>       |-- saturation
>       `-- sensor

I had all the tv-related modules rmmoded overnight, and today when I 
modprobed bttv, all the nodes got created properly.  Very strange... I guess 
there's some kind of timeout in the code somewhere?

I'll try these tests next time though; since problems with my tv-tuner 
card(s) are never-ending, I'm sure I'll get the chance to.

Thanks,
Anthony DiSante
http://nodivisions.com/


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