udev and 30 files in /dev/

udev and 30 files in /dev/

[Daniel]

I've been working with irda under linux and
one problem that I'm unable to explain is
why udev creates /dev/ircomm0 to /dev/ircomm30

How do I configure udev to only create 2 such files?
Is this controlled by the udev rule set?

-Daniel



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Re: udev and 30 files in /dev/

[Greg KH]

On Thu, May 12, 2005 at 09:51:52PM -0700, Daniel wrote:
> 
> I've been working with irda under linux and
> one problem that I'm unable to explain is
> why udev creates /dev/ircomm0 to /dev/ircomm30
> 
> How do I configure udev to only create 2 such files?
> Is this controlled by the udev rule set?

No, it's controlled by the kernel.  What does
/sys/class/whereever_ircomm_is_at show?

It's probably the driver that is creating 30 devices.

thanks,

greg k-h


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Re: udev and 30 files in /dev/

[Daniel]

On Fri, 13 May 2005, Greg KH wrote:

> On Thu, May 12, 2005 at 09:51:52PM -0700, Daniel wrote:
> >
> > I've been working with irda under linux and
> > one problem that I'm unable to explain is
> > why udev creates /dev/ircomm0 to /dev/ircomm30
> >
> > How do I configure udev to only create 2 such files?
> > Is this controlled by the udev rule set?
>
> No, it's controlled by the kernel.  What does
> /sys/class/whereever_ircomm_is_at show?
>
> It's probably the driver that is creating 30 devices.


There is no ircomm or irda mentioned in any of the
subdirectories of /sys/class.  Could this be the problem?

If the driver is creating 30 devices through the kernel
does the kernel have a default setting for this?

-Daniel



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Re: udev and 30 files in /dev/

[Greg KH]

On Fri, May 13, 2005 at 12:54:36PM -0700, Daniel wrote:
> 
> 
> On Fri, 13 May 2005, Greg KH wrote:
> 
> > On Thu, May 12, 2005 at 09:51:52PM -0700, Daniel wrote:
> > >
> > > I've been working with irda under linux and
> > > one problem that I'm unable to explain is
> > > why udev creates /dev/ircomm0 to /dev/ircomm30
> > >
> > > How do I configure udev to only create 2 such files?
> > > Is this controlled by the udev rule set?
> >
> > No, it's controlled by the kernel.  What does
> > /sys/class/whereever_ircomm_is_at show?
> >
> > It's probably the driver that is creating 30 devices.
> 
> 
> There is no ircomm or irda mentioned in any of the
> subdirectories of /sys/class.  Could this be the problem?

Look in /sys/class/tty/ they should be in there.  And they have to be
somewhere, otherwise udev will not create the device nodes :)

> If the driver is creating 30 devices through the kernel
> does the kernel have a default setting for this?

In looking at the ircomm driver, it is the one registering 32 different
devices with the tty layer.  In order for it to only register the proper
devices (meaning, the ones that are actually present at that moment in
time), it would need to be modified.

So, unless you want to change the kernel, this is the way it is going to
work :)

thanks,

greg k-h


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Re: udev and 30 files in /dev/

[Daniel]

> Look in /sys/class/tty/ they should be in there.  And they have to be
> somewhere, otherwise udev will not create the device nodes :)

OK, they are in /sys/class/tty.  My mistake was looking for them
before loading the module.

>
> > If the driver is creating 30 devices through the kernel
> > does the kernel have a default setting for this?
>
> In looking at the ircomm driver, it is the one registering 32 different
> devices with the tty layer.  In order for it to only register the proper
> devices (meaning, the ones that are actually present at that moment in
> time), it would need to be modified.
>
> So, unless you want to change the kernel, this is the way it is going to
> work :)

At lest the reason is now clear.  I'll look at the code.
Maybe if it's something I can fix/change I'll do it.

Thanks!

-Daniel



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