diff --git a/include/linux/libps2.h b/include/linux/libps2.h
index a710bdd..08a450a 100644
--- a/include/linux/libps2.h
+++ b/include/linux/libps2.h
@@ -28,7 +28,7 @@
 	struct serio *serio;
 
 	/* Ensures that only one command is executing at a time */
-	struct semaphore cmd_sem;
+	struct mutex cmd_mutex;
 
 	/* Used to signal completion from interrupt handler */
 	wait_queue_head_t wait;
diff --git a/include/linux/serio.h b/include/linux/serio.h
index aa4d649..582db23 100644
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -18,6 +18,7 @@
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/spinlock.h>
+#include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 
@@ -42,7 +43,7 @@
 	struct serio *parent, *child;
 
 	struct serio_driver *drv;	/* accessed from interrupt, must be protected by serio->lock and serio->sem */
-	struct semaphore drv_sem;	/* protects serio->drv so attributes can pin driver */
+	struct mutex drv_mutex;		/* protects serio->drv so attributes can pin driver */
 
 	struct device dev;
 	unsigned int registered;	/* port has been fully registered with driver core */
@@ -151,17 +152,17 @@
  */
 static inline int serio_pin_driver(struct serio *serio)
 {
-	return down_interruptible(&serio->drv_sem);
+	return mutex_lock_interruptible(&serio->drv_mutex);
 }
 
 static inline void serio_pin_driver_uninterruptible(struct serio *serio)
 {
-	down(&serio->drv_sem);
+	mutex_lock(&serio->drv_mutex);
 }
 
 static inline void serio_unpin_driver(struct serio *serio)
 {
-	up(&serio->drv_sem);
+	mutex_unlock(&serio->drv_mutex);
 }