[gentoo-user] prevent udev from loading a kernel module

[gentoo-user] prevent udev from loading a kernel module

[Bo Ørsted Andresen]

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I haven't been able to figure out how to prevent that the new udev (090) loads 
the ipw2100 (wireless lan) during boot. I don't use it very often, and I have 
set the button that enables/disables the transmitter to also load/unload the 
kernel module. Any hints or pointers appreciated?

-- 
Bo Andresen

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Re: [gentoo-user] prevent udev from loading a kernel module

[Richard Fish]

On 6/12/06, Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
> I haven't been able to figure out how to prevent that the new udev (090) loads
> the ipw2100 (wireless lan) during boot. I don't use it very often, and I have
> set the button that enables/disables the transmitter to also load/unload the
> kernel module. Any hints or pointers appreciated?

The most reliable method I have found is to remove the ipwNNNN lines
from /lib/modules/`uname -r`/modules.alias and modules.pcimap.

-Richard

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Re: [gentoo-user] prevent udev from loading a kernel module

[Bo Ørsted Andresen]

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On Monday 12 June 2006 11:46, Richard Fish wrote:
> The most reliable method I have found is to remove the ipwNNNN lines
> from /lib/modules/`uname -r`/modules.alias and modules.pcimap.

Surely they must have plans to make this possible in a config file? Anyway it 
works. Thx.

-- 
Bo Andresen

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Re: [gentoo-user] prevent udev from loading a kernel module

[Richard Fish]

On 6/12/06, Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
> On Monday 12 June 2006 11:46, Richard Fish wrote:
> > The most reliable method I have found is to remove the ipwNNNN lines
> > from /lib/modules/`uname -r`/modules.alias and modules.pcimap.
>
> Surely they must have plans to make this possible in a config file? Anyway it
> works. Thx.

Ok, here is the 'correct' way to do it (I was too lazy to figure it
out until now...)

In /lib/modules/`uname -r`/modules.alias, you will find lines for the
ipw adapter liike this (run depmod -a to regenerate this file after
following my previous advice)

alias pci:v00008086d00004222sv*sd*bc*sc*i* ipw3945
alias pci:v00008086d00004227sv*sd*bc*sc*i* ipw3945

Add those same lines to a file in /etc/modules.d/.  I used ipw3945,
you will probably want ipw2100:

grep ipw /lib/modules/`uname -r`/modules.alias >>/etc/modules.d/ipw3945

Now edit the /etc/modules.d/ file and change the last setting from
ipw3945/ipw2100 to 'off':

carcharias rjf # grep alias /etc/modules.d/ipw3945
alias pci:v00008086d00004222sv*sd*bc*sc*i* off
alias pci:v00008086d00004227sv*sd*bc*sc*i* off

Now run modules-update, and udev should no longer load the module for
the ipw adapater.

HTH,
-Richard

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Re: [gentoo-user] prevent udev from loading a kernel module

[Bo Ørsted Andresen]

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On Monday 12 June 2006 18:23, Richard Fish wrote:
> Ok, here is the 'correct' way to do it (I was too lazy to figure it
> out until now...)

Excellent. It does work. Thank you very much. :)

-- 
Bo Andresen

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Re: [gentoo-user] prevent udev from loading a kernel module

[Neil Bothwick]

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On Mon, 12 Jun 2006 09:23:28 -0700, Richard Fish wrote:

> Ok, here is the 'correct' way to do it (I was too lazy to figure it
> out until now...)

Before doing this, try listing the module in /etc/hotplug/blacklist, this
is supposed to prevent its automatic loading.


-- 
Neil Bothwick

Don't let the computer bugs bite!

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Re: [gentoo-user] prevent udev from loading a kernel module

[Bo Ørsted Andresen]

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On Monday 12 June 2006 19:21, Neil Bothwick wrote:
> Before doing this, try listing the module in /etc/hotplug/blacklist, this
> is supposed to prevent its automatic loading.

$ grep ipw /etc/hotplug/blacklist
# Don't hotplug ipw2100
ipw2100
$ ls -l /etc/hotplug/blacklist
-rw-r--r-- 1 root root 829 2006-06-07 11:48 /etc/hotplug/blacklist

So I did that 5 days ago. Didn't work. :)

-- 
Bo Andresen

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Re: [gentoo-user] prevent udev from loading a kernel module

[Richard Fish]

On 6/12/06, Bo Ørsted Andresen <bo.andresen@zlin.dk> wrote:
> On Monday 12 June 2006 19:21, Neil Bothwick wrote:
> > Before doing this, try listing the module in /etc/hotplug/blacklist, this
> > is supposed to prevent its automatic loading.
>
> $ grep ipw /etc/hotplug/blacklist
> # Don't hotplug ipw2100
> ipw2100
> $ ls -l /etc/hotplug/blacklist
> -rw-r--r-- 1 root root 829 2006-06-07 11:48 /etc/hotplug/blacklist
>
> So I did that 5 days ago. Didn't work. :)

Yep, that only works for when udev runs /sbin/udev_run_hotplugd.

The current 090 udev appears to do two things for a pci 'hotplug' event:

1. /sbin/modprobe pci:v...
2. /sbin/udev_run_hotplugd pci

My alias tricks above take care of #1, but you still need blacklist to
take care of #2.

-Richard

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