diff --git a/fs/logfs/dev_bdev.c b/fs/logfs/dev_bdev.c
index 223b673..92ca6fb 100644
--- a/fs/logfs/dev_bdev.c
+++ b/fs/logfs/dev_bdev.c
@@ -298,9 +298,9 @@
 	return sync_request(page, bdev, WRITE);
 }
 
-static void bdev_put_device(struct super_block *sb)
+static void bdev_put_device(struct logfs_super *s)
 {
-	close_bdev_exclusive(logfs_super(sb)->s_bdev, FMODE_READ|FMODE_WRITE);
+	close_bdev_exclusive(s->s_bdev, FMODE_READ|FMODE_WRITE);
 }
 
 static int bdev_can_write_buf(struct super_block *sb, u64 ofs)
diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index 9e3dbe3..7466e9d 100644
--- a/fs/logfs/dev_mtd.c
+++ b/fs/logfs/dev_mtd.c
@@ -230,9 +230,9 @@
 	__mtd_writeseg(sb, ofs, ofs >> PAGE_SHIFT, len >> PAGE_SHIFT);
 }
 
-static void mtd_put_device(struct super_block *sb)
+static void mtd_put_device(struct logfs_super *s)
 {
-	put_mtd_device(logfs_super(sb)->s_mtd);
+	put_mtd_device(s->s_mtd);
 }
 
 static int mtd_can_write_buf(struct super_block *sb, u64 ofs)
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index 5d2e66b..446c0f1 100644
--- a/fs/logfs/logfs.h
+++ b/fs/logfs/logfs.h
@@ -136,6 +136,7 @@
 	int	(*erase_segment)(struct logfs_area *area);
 };
 
+struct logfs_super;	/* forward */
 /**
  * struct logfs_device_ops - device access operations
  *
@@ -156,7 +157,7 @@
 			int ensure_write);
 	int (*can_write_buf)(struct super_block *sb, u64 ofs);
 	void (*sync)(struct super_block *sb);
-	void (*put_device)(struct super_block *sb);
+	void (*put_device)(struct logfs_super *s);
 };
 
 /**
diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index f57a150..f07d40e 100644
--- a/fs/logfs/super.c
+++ b/fs/logfs/super.c
@@ -529,7 +529,7 @@
 	logfs_cleanup_rw(sb);
 	if (super->s_erase_page)
 		__free_page(super->s_erase_page);
-	super->s_devops->put_device(sb);
+	super->s_devops->put_device(super);
 	logfs_mempool_destroy(super->s_btree_pool);
 	logfs_mempool_destroy(super->s_alias_pool);
 	kfree(super);
@@ -586,8 +586,8 @@
 	deactivate_locked_super(sb);
 	return err;
 err0:
+	super->s_devops->put_device(super);
 	kfree(super);
-	//devops->put_device(sb);
 	return err;
 }