From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750917AbdAXPLt (ORCPT ); Tue, 24 Jan 2017 10:11:49 -0500 Received: from mail-dm3nam03on0089.outbound.protection.outlook.com ([104.47.41.89]:48096 "EHLO NAM03-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750714AbdAXPLr (ORCPT ); Tue, 24 Jan 2017 10:11:47 -0500 Authentication-Results: spf=pass (sender IP is 204.128.141.23) smtp.mailfrom=infinera.com; lists.infradead.org; dkim=none (message not signed) header.d=none;lists.infradead.org; dmarc=bestguesspass action=none header.from=infinera.com; From: Joakim Tjernlund To: "linux-mtd@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "marek.vasut@gmail.com" , "dwmw2@infradead.org" , "dcb314@hotmail.com" Subject: Re: fs/jffs2/readinode.c:189: faulty logic ? Thread-Topic: fs/jffs2/readinode.c:189: faulty logic ? 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X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by mail.home.local id v0OFC5hI021104 On Tue, 2017-01-24 at 15:52 +0100, Marek Vasut wrote: > On 01/24/2017 09:15 AM, David Binderman wrote: > > Hello there, > > > > fs/jffs2/readinode.c:189]: (style) Condition 'tn.fn.ofs>=offset' is always true > > > > Source code is > > > > if (tn->fn->ofs < offset) > > next = tn->rb.rb_right; > > else if (tn->fn->ofs >= offset) > > next = tn->rb.rb_left; > > else > > break; > > > > Maybe better code > > > > if (tn->fn->ofs < offset) > > next = tn->rb.rb_right; > > else if (tn->fn->ofs > offset) > > next = tn->rb.rb_left; > > else > > break; > > This changes the logic of the code for equality case, please elaborate > why this is OK. There is something odd with current code: next = tn_root->rb_node; while (next) { tn = rb_entry(next, struct jffs2_tmp_dnode_info, rb); if (tn->fn->ofs < offset) next = tn->rb.rb_right; else if (tn->fn->ofs >= offset) next = tn->rb.rb_left; else break; } The else break; is never reached so the above change makes the break work for == Weather this is correct or not I cannot say. Jocke