From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: Getting "BUG: sleeping function"
Date: Fri, 7 Jun 2013 10:54:01 +0200
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To: Eyal Cohen <eyalc@asocstech.com>
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* Eyal Cohen | 2013-05-09 11:46:11 [+0300]:

>Hello.
Hi,

>All seems to work smoothly, except I'm getting a BUG "sleeping function
>called from invalid context" print for calling "pci_unregister_driver()"
>from my module exit function.
>>>From what I understand, the exit function is called from the rmmod
>process, using a regular thread and should not be in atomic mode.
>Therefore it should be able to acquire spinlocks without problem, since
>it could sleep.
>So why is this happening?

My guess would be that you disabled interrupts somewhere in MPUExit().

Sebastian