On Thu, 1 Sep 2016, Vaibhav Hiremath wrote:

> >> I can put prints to trace the execution flow, lets see what comes out
> >> from it.
> > How easily can you reproduce the problem?
> 
> Very easily. I would say 7-8 times out of 10.

Then you can add a printk in hub_activate() just before the call to
device_lock().  Maybe print out the values of the count, owner, and
magic fields of hdev->dev.mutex.  Or anything else you can think of
that might be helpful.

Alan Stern

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