diff --git a/sound/oss/maestro3.c b/sound/oss/maestro3.c
index f3dec70..66044af 100644
--- a/sound/oss/maestro3.c
+++ b/sound/oss/maestro3.c
@@ -144,6 +144,8 @@
 #include <linux/spinlock.h>
 #include <linux/ac97_codec.h>
 #include <linux/wait.h>
+#include <linux/mutex.h>
+
 
 #include <asm/io.h>
 #include <asm/dma.h>
@@ -205,7 +207,7 @@
 		when irqhandler uses s->lock
 		and m3_assp_read uses card->lock ?
 		*/
-    struct semaphore open_sem;
+    struct mutex open_mutex;
     wait_queue_head_t open_wait;
     mode_t open_mode;
 
@@ -2013,17 +2015,17 @@
     file->private_data = s;
 
     /* wait for device to become free */
-    down(&s->open_sem);
+    mutex_lock(&s->open_mutex);
     while (s->open_mode & file->f_mode) {
         if (file->f_flags & O_NONBLOCK) {
-            up(&s->open_sem);
+            mutex_unlock(&s->open_mutex);
             return -EWOULDBLOCK;
         }
-        up(&s->open_sem);
+        mutex_unlock(&s->open_mutex);
         interruptible_sleep_on(&s->open_wait);
         if (signal_pending(current))
             return -ERESTARTSYS;
-        down(&s->open_sem);
+        mutex_lock(&s->open_mutex);
     }
     
     spin_lock_irqsave(&c->lock, flags);
@@ -2047,7 +2049,7 @@
     set_fmt(s, fmtm, fmts);
     s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
 
-    up(&s->open_sem);
+    mutex_unlock(&s->open_mutex);
     spin_unlock_irqrestore(&c->lock, flags);
     return nonseekable_open(inode, file);
 }
@@ -2062,7 +2064,7 @@
     if (file->f_mode & FMODE_WRITE)
         drain_dac(s, file->f_flags & O_NONBLOCK);
 
-    down(&s->open_sem);
+    mutex_lock(&s->open_mutex);
     spin_lock_irqsave(&card->lock, flags);
 
     if (file->f_mode & FMODE_WRITE) {
@@ -2083,7 +2085,7 @@
     s->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
 
     spin_unlock_irqrestore(&card->lock, flags);
-    up(&s->open_sem);
+    mutex_unlock(&s->open_mutex);
     wake_up(&s->open_wait);
 
     return 0;
@@ -2679,7 +2681,7 @@
         init_waitqueue_head(&s->dma_adc.wait);
         init_waitqueue_head(&s->dma_dac.wait);
         init_waitqueue_head(&s->open_wait);
-        init_MUTEX(&(s->open_sem));
+        mutex_init(&(s->open_mutex));
         s->magic = M3_STATE_MAGIC;
 
         m3_assp_client_init(s);