--- x/mm/filemap.c
+++ y/mm/filemap.c
@@ -2800,7 +2800,7 @@ generic_file_read_iter(struct kiocb *ioc
 			iocb->ki_pos += retval;
 			count -= retval;
 		}
-		if (retval != -EIOCBQUEUED)
+		else if (retval != -EIOCBQUEUED)
 			iov_iter_revert(iter, count - iov_iter_count(iter));
 
 		/*