--- x/fs/f2fs/file.c
+++ y/fs/f2fs/file.c
@@ -519,25 +519,17 @@ static loff_t f2fs_llseek(struct file *f
 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct inode *inode = file_inode(file);
-	int ret = 0;
 
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
 		return -EIO;
 
-	inode_lock(inode);
-
-	if (!f2fs_is_compress_backend_ready(inode)) {
-		ret = -EOPNOTSUPP;
-		goto out_unlock;
-	}
+	if (!f2fs_is_compress_backend_ready(inode))
+		return -EOPNOTSUPP;
 
 	file_accessed(file);
 	vma->vm_ops = &f2fs_file_vm_ops;
 	set_inode_flag(inode, FI_MMAP_FILE);
-
-out_unlock:
-	inode_unlock(inode);
-	return ret;
+	return 0;
 }
 
 static int f2fs_file_open(struct inode *inode, struct file *filp)