diff --git a/drivers/net/irda/irtty-sir.c b/drivers/net/irda/irtty-sir.c
index 101750b..6a98b7a 100644
--- a/drivers/net/irda/irtty-sir.c
+++ b/drivers/net/irda/irtty-sir.c
@@ -33,6 +33,7 @@
 #include <asm/uaccess.h>
 #include <linux/smp_lock.h>
 #include <linux/delay.h>
+#include <linux/mutex.h>
 
 #include <net/irda/irda.h>
 #include <net/irda/irda_device.h>
@@ -338,7 +339,7 @@
 /*****************************************************************/
 
 /* serialize ldisc open/close with sir_dev */
-static DECLARE_MUTEX(irtty_sem);
+static DEFINE_MUTEX(irtty_mutex);
 
 /* notifier from sir_dev when irda% device gets opened (ifup) */
 
@@ -348,11 +349,11 @@
 	struct tty_struct *tty;
 
 	/* serialize with ldisc open/close */
-	down(&irtty_sem);
+	mutex_lock(&irtty_mutex);
 
 	priv = dev->priv;
 	if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
-		up(&irtty_sem);
+		mutex_unlock(&irtty_mutex);
 		return -ESTALE;
 	}
 
@@ -363,7 +364,7 @@
 	/* Make sure we can receive more data */
 	irtty_stop_receiver(tty, FALSE);
 
-	up(&irtty_sem);
+	mutex_unlock(&irtty_mutex);
 	return 0;
 }
 
@@ -375,11 +376,11 @@
 	struct tty_struct *tty;
 
 	/* serialize with ldisc open/close */
-	down(&irtty_sem);
+	mutex_lock(&irtty_mutex);
 
 	priv = dev->priv;
 	if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
-		up(&irtty_sem);
+		mutex_unlock(&irtty_mutex);
 		return -ESTALE;
 	}
 
@@ -390,7 +391,7 @@
 	if (tty->driver->stop)
 		tty->driver->stop(tty);
 
-	up(&irtty_sem);
+	mutex_unlock(&irtty_mutex);
 
 	return 0;
 }
@@ -514,13 +515,13 @@
 	priv->dev = dev;
 
 	/* serialize with start_dev - in case we were racing with ifup */
-	down(&irtty_sem);
+	mutex_lock(&irtty_mutex);
 
 	dev->priv = priv;
 	tty->disc_data = priv;
 	tty->receive_room = 65536;
 
-	up(&irtty_sem);
+	mutex_unlock(&irtty_mutex);
 
 	IRDA_DEBUG(0, "%s - %s: irda line discipline opened\n", __FUNCTION__, tty->name);
 
diff --git a/drivers/net/irda/sir_dongle.c b/drivers/net/irda/sir_dongle.c
index 8d22592..d7e32d9 100644
--- a/drivers/net/irda/sir_dongle.c
+++ b/drivers/net/irda/sir_dongle.c
@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/smp_lock.h>
 #include <linux/kmod.h>
+#include <linux/mutex.h>
 
 #include <net/irda/irda.h>
 
@@ -28,7 +29,7 @@
  */
 
 static LIST_HEAD(dongle_list);			/* list of registered dongle drivers */
-static DECLARE_MUTEX(dongle_list_lock);		/* protects the list */
+static DEFINE_MUTEX(dongle_list_lock);		/* protects the list */
 
 int irda_register_dongle(struct dongle_driver *new)
 {
@@ -38,25 +39,25 @@
 	IRDA_DEBUG(0, "%s : registering dongle \"%s\" (%d).\n",
 		   __FUNCTION__, new->driver_name, new->type);
 
-	down(&dongle_list_lock);
+	mutex_lock(&dongle_list_lock);
 	list_for_each(entry, &dongle_list) {
 		drv = list_entry(entry, struct dongle_driver, dongle_list);
 		if (new->type == drv->type) {
-			up(&dongle_list_lock);
+			mutex_unlock(&dongle_list_lock);
 			return -EEXIST;
 		}
 	}
 	list_add(&new->dongle_list, &dongle_list);
-	up(&dongle_list_lock);
+	mutex_unlock(&dongle_list_lock);
 	return 0;
 }
 EXPORT_SYMBOL(irda_register_dongle);
 
 int irda_unregister_dongle(struct dongle_driver *drv)
 {
-	down(&dongle_list_lock);
+	mutex_lock(&dongle_list_lock);
 	list_del(&drv->dongle_list);
-	up(&dongle_list_lock);
+	mutex_unlock(&dongle_list_lock);
 	return 0;
 }
 EXPORT_SYMBOL(irda_unregister_dongle);
@@ -75,7 +76,7 @@
 		return -EBUSY;
 	
 	/* serialize access to the list of registered dongles */
-	down(&dongle_list_lock);
+	mutex_lock(&dongle_list_lock);
 
 	list_for_each(entry, &dongle_list) {
 		drv = list_entry(entry, struct dongle_driver, dongle_list);
@@ -109,14 +110,14 @@
 	if (!drv->open  ||  (err=drv->open(dev))!=0)
 		goto out_reject;		/* failed to open driver */
 
-	up(&dongle_list_lock);
+	mutex_unlock(&dongle_list_lock);
 	return 0;
 
 out_reject:
 	dev->dongle_drv = NULL;
 	module_put(drv->owner);
 out_unlock:
-	up(&dongle_list_lock);
+	mutex_unlock(&dongle_list_lock);
 	return err;
 }