linux-kernel - [PATCH 19/20] UML - port mutex conversion

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Date:	Thu, 17 Jan 2008 16:40:50 -0500
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Daniel Walker <dwalker@...sta.com>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 19/20] UML - port mutex conversion

From: Daniel Walker <dwalker@...sta.com>

The port_sem is already used as a mutex since it's using DECLARE_MUTEX(),
but the underlying construct is still a semaphore .. This patch switches
it over to a struct mutex.

Signed-off-by: Daniel Walker <dwalker@...sta.com>
Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
---
 arch/um/drivers/port_kern.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: linux-2.6.22/arch/um/drivers/port_kern.c
===================================================================
--- linux-2.6.22.orig/arch/um/drivers/port_kern.c	2008-01-17 13:44:46.000000000 -0500
+++ linux-2.6.22/arch/um/drivers/port_kern.c	2008-01-17 13:47:39.000000000 -0500
@@ -6,6 +6,7 @@
 #include "linux/completion.h"
 #include "linux/interrupt.h"
 #include "linux/list.h"
+#include "linux/mutex.h"
 #include "asm/atomic.h"
 #include "init.h"
 #include "irq_kern.h"
@@ -120,7 +121,7 @@ static int port_accept(struct port_list 
 	return 0;
 }
 
-static DECLARE_MUTEX(ports_sem);
+static DEFINE_MUTEX(ports_mutex);
 static LIST_HEAD(ports);
 
 static void port_work_proc(struct work_struct *unused)
@@ -161,7 +162,7 @@ void *port_data(int port_num)
 	struct port_dev *dev = NULL;
 	int fd;
 
-	down(&ports_sem);
+	mutex_lock(&ports_mutex);
 	list_for_each(ele, &ports) {
 		port = list_entry(ele, struct port_list, list);
 		if (port->port == port_num)
@@ -216,7 +217,7 @@ void *port_data(int port_num)
  out_free:
 	kfree(port);
  out:
-	up(&ports_sem);
+	mutex_unlock(&ports_mutex);
 	return dev;
 }
 
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