diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
index 3747a43..6a265ab 100644
--- a/sound/pci/es1968.c
+++ b/sound/pci/es1968.c
@@ -103,6 +103,8 @@
 #include <linux/slab.h>
 #include <linux/gameport.h>
 #include <linux/moduleparam.h>
+#include <linux/mutex.h>
+
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/mpu401.h>
@@ -569,7 +571,7 @@
 	u16 maestro_map[32];
 	int bobclient;		/* active timer instancs */
 	int bob_freq;		/* timer frequency */
-	struct semaphore memory_mutex;	/* memory lock */
+	struct mutex memory_mutex;	/* memory lock */
 
 	/* APU states */
 	unsigned char apu[NR_APUS];
@@ -1356,13 +1358,13 @@
 	struct list_head *p;
 	int max_size = 0;
 	
-	down(&chip->memory_mutex);
+	mutex_lock(&chip->memory_mutex);
 	list_for_each(p, &chip->buf_list) {
 		struct esm_memory *buf = list_entry(p, struct esm_memory, list);
 		if (buf->empty && buf->buf.bytes > max_size)
 			max_size = buf->buf.bytes;
 	}
-	up(&chip->memory_mutex);
+	mutex_unlock(&chip->memory_mutex);
 	if (max_size >= 128*1024)
 		max_size = 127*1024;
 	return max_size;
@@ -1375,20 +1377,20 @@
 	struct list_head *p;
 	
 	size = ((size + ESM_MEM_ALIGN - 1) / ESM_MEM_ALIGN) * ESM_MEM_ALIGN;
-	down(&chip->memory_mutex);
+	mutex_lock(&chip->memory_mutex);
 	list_for_each(p, &chip->buf_list) {
 		buf = list_entry(p, struct esm_memory, list);
 		if (buf->empty && buf->buf.bytes >= size)
 			goto __found;
 	}
-	up(&chip->memory_mutex);
+	mutex_unlock(&chip->memory_mutex);
 	return NULL;
 
 __found:
 	if (buf->buf.bytes > size) {
 		struct esm_memory *chunk = kmalloc(sizeof(*chunk), GFP_KERNEL);
 		if (chunk == NULL) {
-			up(&chip->memory_mutex);
+			mutex_unlock(&chip->memory_mutex);
 			return NULL;
 		}
 		chunk->buf = buf->buf;
@@ -1400,7 +1402,7 @@
 		list_add(&chunk->list, &buf->list);
 	}
 	buf->empty = 0;
-	up(&chip->memory_mutex);
+	mutex_unlock(&chip->memory_mutex);
 	return buf;
 }
 
@@ -1409,7 +1411,7 @@
 {
 	struct esm_memory *chunk;
 
-	down(&chip->memory_mutex);
+	mutex_lock(&chip->memory_mutex);
 	buf->empty = 1;
 	if (buf->list.prev != &chip->buf_list) {
 		chunk = list_entry(buf->list.prev, struct esm_memory, list);
@@ -1428,7 +1430,7 @@
 			kfree(chunk);
 		}
 	}
-	up(&chip->memory_mutex);
+	mutex_unlock(&chip->memory_mutex);
 }
 
 static void snd_es1968_free_dmabuf(struct es1968 *chip)
@@ -2579,7 +2581,7 @@
 	INIT_LIST_HEAD(&chip->buf_list);
 	INIT_LIST_HEAD(&chip->substream_list);
 	spin_lock_init(&chip->ac97_lock);
-	init_MUTEX(&chip->memory_mutex);
+	mutex_init(&chip->memory_mutex);
 	tasklet_init(&chip->hwvol_tq, es1968_update_hw_volume, (unsigned long)chip);
 	chip->card = card;
 	chip->pci = pci;