Using udevstart as hotplug program.

Using udevstart as hotplug program.

[Nori, Soma Sekhar]

Hi,

I am running a 2.6.10 kernel (from kernel.org)

I am trying to use udevstart (version 055) as the hotplug program
for USB plug and unplug events.

I compiled the kernel with CONFIG_HOTPLUG=y and CONFIG_KOBJECT_UEVENT=y

Also, before connecting any USB devices I do:
echo "/sbin/udevstart" > /proc/sys/kernel/hotplug

But, after connecting a USB mouse, /dev/usb/hiddev0 does not get created

automatically. But, if I run udevstart manually, the device node does 
get created.

I guess /sbin/udevstart is not getting called by the hotplug subsystem.
From what I understand, any program given in /proc/sys/kernel/hotplug 
should get called whenever a USB plug/unplug occurs. 

I know that the USB subsystem is working correctly since I can 
cat /dev/usb/hiddev0 and see the mouse movements getting dumped.
(So the device must have enumerated correctly)

Note that I do not have /sbin/hotplug on my filesystem. But I guess its
not 
necessary to have it.

What am I missing here? Is there any USB specific configuration for
generating
hotplug events? I could'nt find any such config though. Please let me
know.

Thanks,
Sekhar Nori


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Re: Using udevstart as hotplug program.

[Greg KH]

On Thu, Jun 16, 2005 at 02:30:37PM +0530, Nori, Soma Sekhar wrote:
> 
> Hi,
> 
> I am running a 2.6.10 kernel (from kernel.org)
> 
> I am trying to use udevstart (version 055) as the hotplug program
> for USB plug and unplug events.

Why udevstart?  That program can't handle netlink or hotplug events.
It's only supposed to be used at boot time.

I think you mean 'udevsend' :)

thanks,

greg k-h


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RE: Using udevstart as hotplug program.

[Nori, Soma Sekhar]

> > I am trying to use udevstart (version 055) as the hotplug program
> > for USB plug and unplug events.
> 
> Why udevstart?  That program can't handle netlink or hotplug events.
> It's only supposed to be used at boot time.

I am trying to have my fs in ~400K and as I already had the udevstart on
my fs
I was trying to piggyback to save space..

> 
> I think you mean 'udevsend' :)

I installed all the udev binaries and scripts by doing:
make; make install

Here are my observations:

When using udevstart/udevsend as the hotplug program:

1) The device node does not get created when the mouse is plugged in for
the first time. The node gets created after I unplug the mouse. The
device
node gets created if I plugin two mouses (mice) using a hub.

2) After the initial laziness in creating the node, node is created (and
is also destroyed in case of udevsend) after each connect and
disconnect.

When using udev as the hotplug program:

1) The device nodes get created the first time I plug in the mouse and
gets removed as I unplug it. Everything is hunky-dory!

I enabled the debug in lib/kobject_uevent.c and saw that kobject_hotplug

is calling call_usermodehelper (thrice) for each plug and unplug event. 

What can be going wrong in case of udevsend? Where should I start
debugging from?

I still do not have /sbin/hotplug on my fs. Is it necessary to have if
using udev?

Thanks,
Sekhar Nori.



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Re: Using udevstart as hotplug program.

[David Brownell]

On Friday 17 June 2005 4:04 am, Nori, Soma Sekhar wrote:
> 
> I still do not have /sbin/hotplug on my fs. Is it necessary to have if
> using udev?

Something will need to "modprobe -q $MODALIAS", unless your kernel has
all drivers statically linked, and /sbin/hotplug is the usual place for it.

- Dave


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