From 593787e3b3ccccfc5e37bc7b7c4744266dc373b1 Mon Sep 17 00:00:00 2001
From: Shaun Ruffell <sruffell@digium.com>
Date: Mon, 3 Jan 2011 18:26:00 +0000
Subject: [PATCH] dahdi: If mutexes are not available use semaphores instead.

Mutexes were added in 2.6.16.  This will allow future changes to use the
mutex API without breaking on pre 2.6.16 kernels.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Kinsey Moore <kmoore@digium.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@9579 a0bf4364-ded3-4de4-8d8a-66a801d63aff
---
 include/dahdi/kernel.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/dahdi/kernel.h b/include/dahdi/kernel.h
index ce503d9..584eb8c 100644
--- a/include/dahdi/kernel.h
+++ b/include/dahdi/kernel.h
@@ -1317,6 +1317,12 @@ wait_for_completion_interruptible_timeout(struct completion *x,
 	struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
 #endif
 
+#ifndef DEFINE_MUTEX
+#define DEFINE_MUTEX DEFINE_SEMAPHORE
+#define mutex_lock(_x) down(_x)
+#define mutex_unlock(_x) up(_x)
+#endif
+
 #ifndef DMA_BIT_MASK
 #define DMA_BIT_MASK(n)	(((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
 #endif