block: drbd: Convert semaphore to mutex

The bm_change semaphore is semantically a mutex. Convert it to a real
mutex.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
This commit is contained in:
Thomas Gleixner 2010-01-29 20:39:07 +00:00 • committed by Philipp Reisner
commit 8a03ae2a5b