From c5afd9e2f7eb81a77d19cea263528d42d8ea171e Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@linutronix.de>
Date: Sun, 26 Jul 2009 00:55:00 +0200
Subject: [PATCH] xfs: semaphore cleanup

commit 13a12e586373a8dd7a078d07921044f84f6e2601 in tip.

bp->b_sema claims to be a mutex, but it is a semaphore with non
obvious semantics. Make it a real semaphore.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc:  Christoph Hellwig <hch@lst.de>

diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index 77b8be8..ddd2fc2 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -236,7 +236,7 @@ _xfs_buf_initialize(
 	init_completion(&bp->b_iowait);
 	INIT_LIST_HEAD(&bp->b_list);
 	INIT_LIST_HEAD(&bp->b_hash_list);
-	init_MUTEX_LOCKED(&bp->b_sema); /* held, no waiters */
+	sema_init(&bp->b_sema, 0); /* held, no waiters */
 	XB_SET_OWNER(bp);
 	bp->b_target = target;
 	bp->b_file_offset = range_base;
-- 
1.7.1.1