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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 80136C43460 for ; Sun, 18 Apr 2021 08:14:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4AA0161002 for ; Sun, 18 Apr 2021 08:14:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230100AbhDRIPS (ORCPT ); Sun, 18 Apr 2021 04:15:18 -0400 Received: from mout02.posteo.de ([185.67.36.66]:49089 "EHLO mout02.posteo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229671AbhDRIPR (ORCPT ); Sun, 18 Apr 2021 04:15:17 -0400 Received: from submission (posteo.de [89.146.220.130]) by mout02.posteo.de (Postfix) with ESMTPS id 39AB72400FC for ; Sun, 18 Apr 2021 10:14:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1618733688; bh=bl3UDLdYZz9aw9ENMX943zhNbIJ/5yxXivl5iyw3ZD0=; h=From:To:Cc:Subject:Date:From; b=A+Zt2Fuk5LF5fw+rAkqkvR/UB1b3pe0/28xjKx6YFAsbXYGRXemgVOk8UF3BLggV8 Jn6wnyerU4XMzF98GVqAHL8hKjxWyVjQ9eoNtt1vFa6H6evoV/NFYudnP+1iYcga9H H1Wvwe6uvMKxujWuIdzy03+p8iUP4riPnVVB7HOlB0ijzEHqjjAMvT0K7H48Nk14o6 nNEU43KXa56GQFSjoc0YIKh30mF4VkmQ0rqw9POMNB3pYfhfhhVrOyjXE4/sc1L8bn GjW40OQ9McKGuSdw27JKrTkXzaKq2PscZcjs1aCrTuvJ2bd8D4u3IB8nOFAJi4dXU6 3RsvzkV9tYCig== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4FNN5z5jgjz9rxH; Sun, 18 Apr 2021 10:14:47 +0200 (CEST) From: Alexander Egorenkov To: linux-kernel@vger.kernel.org Cc: Alexander Egorenkov Subject: [PATCH 1/1] lib: scatterlist: Fix SGL length in sg_split() if !CONFIG_NEED_SG_DMA_LENGTH Date: Sun, 18 Apr 2021 08:14:41 +0000 Message-Id: <20210418081441.5040-1-egorenar-dev@posteo.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If CONFIG_NEED_SG_DMA_LENGTH is NOT enabled then sg_dma_len() is an alias for the length field in a SGL. In that case sg_split() wrongly resets the length of split SGLs to zero after it was set correctly before. Signed-off-by: Alexander Egorenkov --- lib/sg_split.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/sg_split.c b/lib/sg_split.c index 60a0babebf2e..3d9b32084d78 100644 --- a/lib/sg_split.c +++ b/lib/sg_split.c @@ -92,7 +92,8 @@ static void sg_split_phys(struct sg_splitter *splitters, const int nb_splits) out_sg->offset = 0; } sg_dma_address(out_sg) = 0; - sg_dma_len(out_sg) = 0; + if (IS_ENABLED(CONFIG_NEED_SG_DMA_LENGTH)) + sg_dma_len(out_sg) = 0; in_sg = sg_next(in_sg); } out_sg[-1].length = split->length_last_sg; -- 2.31.1