From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Sun, 20 Jul 2014 21:22:51 -0700
Subject: How to prevent a module from unloading when in used
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On Mon, Jul 21, 2014 at 09:09:02AM +0530, Chetan Nanda wrote:
> I try to debug the hang when unloading of driver. I am using kernel v3.10
> and it hangs in 'wait_for_zero_refcount'.
> I checked that this function has been removed in kernel 3.13.
> But I am not able to find the patch for this change.
> 
> Is there an easy way to find the patch which cause removal of wait from
> module unloading in v3.13.

You have the full git tree, it should be very easy to find, you don't
need help from me.

good luck,

greg k-h