On Mon, Mar 11, Greg KH wrote:
> Hi,
>
> Since the latest USB patch went in that added a proper delay to the
> hub connection sequence, a lot of people have been reporting odd
> problems with some USB hubs, keyboards, and mice. I've seen this
> problem too. It is usually fixed by just replugging the device in, but
> not all of the time.
>
> The reason seems to be that usbmodules is getting called from the
> hotplug package at the same time the hub driver is talking to the
> device. Since we don't have control endpoint locking in the kernel USB
> code yet, this messes things up :)
>
> The patch below, from Olaf Hering, seems to fix the problem. Also just
> removing the usbmodules binary seems to fix it for other people, but
> that's not really a good fix.
>
> Let me know what you think about this.
>
> thanks,
>
> greg k-h
>
>
> Index: etc/hotplug/usb.agent
> ===================================================================
> RCS file: /cvsroot/linux-hotplug/admin/etc/hotplug/usb.agent,v
> retrieving revision 1.19
> diff -a -u -r1.19 usb.agent
> --- etc/hotplug/usb.agent 18 Jan 2002 03:10:42 -0000 1.19
> +++ etc/hotplug/usb.agent 11 Mar 2002 21:52:10 -0000
> @@ -297,6 +297,9 @@
> case $ACTION in
>
> add)
> + # Let the usb subsystem finish talking to the device, before we do
> + sleep 3
> +
> usb_convert_vars
>
> FOUND=false
That patch does indeed fix the problem with some devices, sometimes you
even need a sleep 5.
But since all that runs in background the bootscripts will continue to
run. And if gpm wants the /dev/input/mice node and the mousedriver is
not loaded ...
Or printer.o and rclpd, everything fails :)
The delay has to be added, either to the hotplug scripts or to the
usbdevfs core. But it will delay the driver loading in both cases, so
the startup scripts may fail. It depends on your configuration and the
speed of your cpu and/or IO.
Gruss Olaf
--
$ man clone
BUGS
Main feature not yet implemented...
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