> I agree that for driver modules it is fine to let cron take care of
> it. Mine is a user mode driver, though. The remove in the kernel
> neatly takes care of removing the /proc/bus/usb file, and the
> hotplug script, being single threaded, should call my remove before
> it calls the next add for the same device.

You might want to look at that some more.  Comments
about that invocation are out of date ... once all the
call_usermodehelper() invocations became asynchronous,
such guarantees disappeared.  Doesn't much help if each
helper is a single thread, when that change permits system
scheduling to arbitrarily shuffle those threads...

- Dave



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