API consolidation spin_lock/spin_unlock to spin_unlock_wait

Hi !

This patch set proposes a small API consolidation. replacing:

	spin_lock(lock);
	spin_unlock(lock);
by:
	spin_unlock_wait(lock);

in a number of locations.

patch and compile testing is against linux-next 3.13.0-rc4 (git pull today)

thx!
hofrat