tree 3781c5443068f2fc79c2bb70c8793075b608d1f0
parent c3c1250e93a7ab1327a9fc49d2a22405672f4204
author Juan Gutierrez <jgutierrez@ti.com> 1315290616 +0300
committer Ohad Ben-Cohen <ohad@wizery.com> 1316623532 +0300

hwspinlock/core: use a mutex to protect the radix tree

Since we're using non-atomic radix tree allocations, we
should be protecting the tree using a mutex and not a
spinlock.

Non-atomic allocations and process context locking is good enough,
as the tree is manipulated only when locks are registered/
unregistered/requested/freed.

The locks themselves are still protected by spinlocks of course,
and mutexes are not involved in the locking/unlocking paths.

Cc: <stable@kernel.org>
Signed-off-by: Juan Gutierrez <jgutierrez@ti.com>
[ohad@wizery.com: rewrite the commit log, #include mutex.h, add minor
commentary]
[ohad@wizery.com: update register/unregister parts in hwspinlock.txt]
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>