diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 97c73d610eeb4..dd72e75beb82e 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -229,6 +229,7 @@ static void put_ep (struct ep_data *data)
  */
 
 static const char *CHIP;
+static DEFINE_MUTEX(sb_mutex);		/* Serialize superblock operations */
 
 /*----------------------------------------------------------------------*/
 
@@ -2013,13 +2014,20 @@ gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
 {
 	struct inode	*inode;
 	struct dev_data	*dev;
+	int		rc;
 
-	if (the_device)
-		return -ESRCH;
+	mutex_lock(&sb_mutex);
+
+	if (the_device) {
+		rc = -ESRCH;
+		goto Done;
+	}
 
 	CHIP = usb_get_gadget_udc_name();
-	if (!CHIP)
-		return -ENODEV;
+	if (!CHIP) {
+		rc = -ENODEV;
+		goto Done;
+	}
 
 	/* superblock */
 	sb->s_blocksize = PAGE_SIZE;
@@ -2056,13 +2064,17 @@ gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
 	 * from binding to a controller.
 	 */
 	the_device = dev;
-	return 0;
+	rc = 0;
+	goto Done;
 
-Enomem:
+ Enomem:
 	kfree(CHIP);
 	CHIP = NULL;
+	rc = -ENOMEM;
 
-	return -ENOMEM;
+ Done:
+	mutex_unlock(&sb_mutex);
+	return rc;
 }
 
 /* "mount -t gadgetfs path /dev/gadget" ends up here */
@@ -2084,6 +2096,7 @@ static int gadgetfs_init_fs_context(struct fs_context *fc)
 static void
 gadgetfs_kill_sb (struct super_block *sb)
 {
+	mutex_lock(&sb_mutex);
 	kill_litter_super (sb);
 	if (the_device) {
 		put_dev (the_device);
@@ -2091,6 +2104,7 @@ gadgetfs_kill_sb (struct super_block *sb)
 	}
 	kfree(CHIP);
 	CHIP = NULL;
+	mutex_unlock(&sb_mutex);
 }
 
 /*----------------------------------------------------------------------*/