block: drbd: Convert semaphore to mutex
authorThomas Gleixner <tglx@linutronix.de>
Fri, 29 Jan 2010 20:39:07 +0000 (20:39 +0000)
committerPhilipp Reisner <philipp.reisner@linbit.com>
Thu, 11 Mar 2010 12:30:16 +0000 (13:30 +0100)
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>

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