You pretty much have three options at this point
1- Roll the dice and continue with what you have and see if your driver works with the 4K kernel stacks
2- Check on the links in
this thread. Snecklifter has a kernel available that gets around the 4K stacks issue
3 - Compile your own kernel and disable 4K stacks
Of course there is also complaining to Red Hat and asking why ALL their stock kernels have to have 4K stacks enabled. I would think that they could compile one or two that don't have this "feature".