From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A432AC43381 for ; Sat, 30 Mar 2019 18:30:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7CC7D2082C for ; Sat, 30 Mar 2019 18:30:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="qWDl7DJw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731119AbfC3Sai (ORCPT ); Sat, 30 Mar 2019 14:30:38 -0400 Received: from mail-lf1-f65.google.com ([209.85.167.65]:44517 "EHLO mail-lf1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731052AbfC3SaQ (ORCPT ); Sat, 30 Mar 2019 14:30:16 -0400 Received: by mail-lf1-f65.google.com with SMTP id u9so3532819lfe.11 for ; Sat, 30 Mar 2019 11:30:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=FurKqlti6iolFnGNzTOVMo3Q5vZlOYrmsUdCDGaEJfs=; b=qWDl7DJwFa8EKzxPDmPuC2RcaWihI4Y4TX3HR5qydmDvFpNctZqp6UEYIzyW8UaDdZ LKyG1GrP/s9F2UtHIL/7lGpdSHEEIVmTu0/d+7hXYnkwBRroY5CiC7BGxslEBZiwsIgl h+JFGVzYqpUnY+TPXdbR557MaEC2zXGVjtgHhNQsB/GIgrGzpLWjLMv1BEq+Q6U0Bjmo gbkFhk/N8G2K1al9y5rFA8ZPxaeq2Pi5ElHDsTzqBdnR2SCIPFSf1jVDGP5tVgpYrEAh dG5jz4FBRmOssWCBHFH10Cr+AscBPjV5xXqQH/hxXGyHW/EiuCmNMpZU95B8mXY6zgzw aX5w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=FurKqlti6iolFnGNzTOVMo3Q5vZlOYrmsUdCDGaEJfs=; b=Doh6a42AOIX8b56QUggKYzp7zTz5ayCKyqJSYImCfx3/cA4avA4mDT12RRXqvSeVRJ /Tx01C2Z+Os1JerrM5oe8VczrcGgrW9dJ6IGPCy+J0oDvhvkhMWC3rsRIfUVDrlAvKC1 6yEm5qBHjEaK3WccnTFy1xZGxxPWvRlkQe2tk6bQdJTuK1ENxsLA/Tg54Kn5mQG/RZaG uFspxFZYrOzZNMSbXLRTJ9aGhwbl6tnvAzBQYKzXaKllhuHquez5L9HgUfoAJmMG+Ak0 AcuxQaXHGu2thYG0fIiRt/+DnnISkynICXue3zP+a7Zvl6xzImmKghtAHuWRhseAsEBf E3Gg== X-Gm-Message-State: APjAAAW1JhcgTtxXXyOkeN0Xn2vEqe/4piWrYFq+uZS+fdxGa69+cqAs OxBBlf/RPQFdjGFJbZU42mt3cTYz X-Google-Smtp-Source: APXvYqxpxnfDyg3KgZZDIhvMyKBIwTco37hNNa/jAKuyDLwmVhgtJCtBM0zsIry7EcJwGKH1nqCFNQ== X-Received: by 2002:a19:9145:: with SMTP id y5mr30373021lfj.35.1553970614323; Sat, 30 Mar 2019 11:30:14 -0700 (PDT) Received: from localhost.localdomain (v902-731.aalto.fi. [130.233.10.238]) by smtp.gmail.com with ESMTPSA id o7sm1060058ljj.23.2019.03.30.11.30.12 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 30 Mar 2019 11:30:13 -0700 (PDT) From: Ferdinand Blomqvist To: linux-kernel@vger.kernel.org Cc: Thomas Gleixner Subject: [RFC PATCH 5/7] rslib: Fix handling of of caller provided syndrome Date: Sat, 30 Mar 2019 20:29:45 +0200 Message-Id: <20190330182947.8823-6-ferdinand.blomqvist@gmail.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20190330182947.8823-1-ferdinand.blomqvist@gmail.com> References: <20190330182947.8823-1-ferdinand.blomqvist@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check if the syndrome provided by the caller is zero, and act accordingly. Signed-off-by: Ferdinand Blomqvist --- lib/reed_solomon/decode_rs.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/lib/reed_solomon/decode_rs.c b/lib/reed_solomon/decode_rs.c index 78629bbe6590..7ecc449e57e9 100644 --- a/lib/reed_solomon/decode_rs.c +++ b/lib/reed_solomon/decode_rs.c @@ -42,8 +42,16 @@ BUG_ON(pad < 0 || pad >= nn - nroots); /* Does the caller provide the syndrome ? */ - if (s != NULL) - goto decode; + if (s != NULL) { + for (i = 0; i < nroots; i++) { + /* The syndrome is in index form, so nn represents zero */ + if (s[i] != nn) + goto decode; + } + + /* syndrome is zero, no errors to correct */ + return 0; + } /* form the syndromes; i.e., evaluate data(x) at roots of * g(x) */ -- 2.17.2