From 0df7deaff0cac77b7601538f1c2c3b667c6b57bd Mon Sep 17 00:00:00 2001
From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Sat, 24 May 2008 23:15:19 +0000
Subject: [PATCH] Fixed configure check for linux/mutex.h

---
 configure.ac          | 3 +++
 include/linux/mutex.h | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 6870c149..0673d8ae 100644
--- a/configure.ac
+++ b/configure.ac
@@ -135,6 +135,9 @@ AC_ARG_ENABLE([kbuild], [  --enable-kbuild	Force use (or not) of kernel's Kbuild
 	[ENABLE_KBUILD=$enableval], [])
 AM_CONDITIONAL([CONFIG_KBUILD], [test ${ENABLE_KBUILD} = "yes"])
 COMEDI_CHECK_HAVE_MUTEX_H([$LINUX_SRC_DIR], [HAVE_MUTEX_H="yes"], [HAVE_MUTEX_H="no"])
+if test ${HAVE_MUTEX_H} = "yes" ; then
+	AC_DEFINE([CONFIG_COMEDI_HAVE_MUTEX_H], [true], [Define if Linux kernel has mutex.h header])
+fi
 AS_LINUX_CONFIG_OPTION_MODULE(CONFIG_ISA)
 
 AC_DEFINE(CONFIG_COMEDI_DEBUG, true, [Define if debugging is enabled])
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 90218156..ee3f9ac5 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -25,7 +25,9 @@
 #ifndef __COMPAT_LINUX_MUTEX_H_
 #define __COMPAT_LINUX_MUTEX_H_
 
-#ifdef HAVE_MUTEX_H
+#include <linux/config.h>
+
+#ifdef CONFIG_COMEDI_HAVE_MUTEX_H
 
 #include_next <linux/mutex.h>
 
-- 
2.26.2