/sbin/hotplug and hal.dev timeouts

[Kay Sievers]

On Sun, 2004-08-29 at 18:30 +0200, David Zeuthen wrote:
> On Sat, 2004-08-28 at 04:08 +0200, Kay Sievers wrote:
> > I've discovered some strange behavior with HAL and a lot of USB devices
> > connected. My printer wasn't properly recognized, cause udev needed 25
> > seconds  to send the dev.d/ event to HAL. This is caused by the lot of
> > sleep calls to wait for sysfs files and device nodes in the /etc/hotplug
> > scripts. These sleeps take longer than the 10 second timeout of udevd
> > and udevd will delay for another 10 seconds.
> 
> Interesting - the kernel is more or less broken is this regard, I think
> even Greg KH admits that, hopefully someone will fix it some day. 
> 
> Even more interesting is the fact that some files in sysfs doesn't
> always show up (such as name of vendor for USB device) so it's
> definitely worthwhile to only wait for a subset of them; that's what
> hal.hotplug tries to achieve; though it could use some love. The SEQNUM
> from udev and having a file to read the initial seqnum from will also
> help a bit here.
> 
> > It can be fixed (as far as /sbin/hotplug if fixable at all :))
> 
> Hopefully the work Robert and yourself is doing on D-BUS love in the
> kernel will alleviate this someday.

I'm on it the whole weekend. Will post something tonight. Notification
of "hotplug" and "block device claiming by filesystem code" is working
here :)

> >  by
> > reordering the execution of the holplug helpers. I've added the 10- and
> > 20- and it's working now.
> > 
> > [root at pim hal]# tree /etc/hotplug.d
> > /etc/hotplug.d
> > `-- default
> >     |-- 10-udev.hotplug -> /sbin/udevsend
> >     |-- 20-hal.hotplug -> /usr/libexec/hal.hotplug
> >     `-- default.hotplug
> > 
> > Did anybody discovered something similar?
> > 
> 
> Not really, guess I need to buy some more exotic devices, heh. This is a
> useful suggestion though, you should send that upstream. I'm changing
> hal to install 20-hal.hotplug and 10-hal.dev because of this.

Ok, will send it.

Thanks,
Kay

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