Julius Werner, the author of the commit in question, has found the problem and 
created a patch. The problem is in the place that I identified, but specific 
regression-triggering details are different that I originally thought. The 
patch is available here:
https://lkml.org/lkml/2014/7/8/571

I tested this patch and can confirm that it fixes the regression in kernel 
3.2.x. Newer kernels have not been affected by the regression, as it is masked 
by another code change that has not been backported to 3.2. Here is the link 
for the discussion:
http://thread.gmane.org/gmane.linux.usb.general/110685

As I understand it, we are now waiting for Julius' patch to be pulled to
the mainline kernel.

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https://bugs.launchpad.net/bugs/1330530

Title:
  [Dell Vostro 430] Regression: Kernel 3.2.0-64 problems with USB3
  controller

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