Contigfree takes too much time that cuases PCIe driver unload to take up to 30 minutes

[Ryan Stone]

I'm not sure why configfree() would be taking a long time, but
configmalloc() can be extraordinarily expensive when it needs to
defragment memory to meet the request.  Does your application really
require a lot of physically contiguous memory?  if you can restructure
to not require contigmalloc() all -- maybe by using S/G DMA -- you may
find your life significantly easier.