diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 53af808..470d3a0 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -104,7 +104,6 @@
 static int sg_add(struct device *, struct class_interface *);
 static void sg_remove(struct device *, struct class_interface *);
 
-static DEFINE_MUTEX(sg_mutex);
 static DEFINE_SPINLOCK(sg_open_exclusive_lock);
 
 static DEFINE_IDR(sg_index_idr);
@@ -268,7 +267,6 @@
 	int res;
 	int retval;
 
-	mutex_lock(&sg_mutex);
 	nonseekable_open(inode, filp);
 	SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
 	sdp = sg_get_dev(dev);
@@ -350,7 +348,6 @@
 sg_put:
 	if (sdp)
 		sg_put_dev(sdp);
-	mutex_unlock(&sg_mutex);
 	return retval;
 }
 
@@ -808,7 +805,7 @@
 	return ret;
 }
 
-static int
+static long
 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 {
 	void __user *p = (void __user *)arg;
@@ -1118,18 +1115,6 @@
 	}
 }
 
-static long
-sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
-{
-	int ret;
-
-	mutex_lock(&sg_mutex);
-	ret = sg_ioctl(filp, cmd_in, arg);
-	mutex_unlock(&sg_mutex);
-
-	return ret;
-}
-
 #ifdef CONFIG_COMPAT
 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 {
@@ -1377,7 +1362,7 @@
 	.read = sg_read,
 	.write = sg_write,
 	.poll = sg_poll,
-	.unlocked_ioctl = sg_unlocked_ioctl,
+	.unlocked_ioctl = sg_ioctl,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl = sg_compat_ioctl,
 #endif