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=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 818D8C07E95 for ; Fri, 16 Jul 2021 06:34:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4C6E66023B for ; Fri, 16 Jul 2021 06:34:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4C6E66023B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BJHsDW+OHKxso25KYRN/TT/vQaB07AftB9v86MpYyQc=; b=Th97LaeyVYHzj5 AJpfy/Ro7/cgZWTeZ5t6caijqw4JOhaILcEf0jH13f6/J04RNlfCkAiU7+c/eOal3iUpinT3EC2UX dXrcnea0Wg1JLBVurUfYx/GENhYxo0oNhFVbSAGSrtM45HzOo6I4cmOoeZlZ0KYYtFF3VKfx5P5YY mKQw9Sz9YcvzGJDnKP1S7TfPytPZYb2phhUsUnJr5lmC6/02SG5jU9LRt4upLIGNXO5Wm3fhCJqW/ wLjOO8v+CfINmgxjXhZ+BUbZuujIJaQq0xXX/rRtFdDxboRcj00vyJnU+X1+atkP9g4quGuQfIjYG LG1zcrCyCk+k3+QbZgnA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4HPn-003N9d-LG; Fri, 16 Jul 2021 06:33:39 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m4HPi-003N7x-OU for linux-arm-kernel@lists.infradead.org; Fri, 16 Jul 2021 06:33:36 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id C874467373; Fri, 16 Jul 2021 08:33:32 +0200 (CEST) Date: Fri, 16 Jul 2021 08:33:32 +0200 From: Christoph Hellwig To: Logan Gunthorpe Cc: linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, iommu@lists.linux-foundation.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, Christoph Hellwig , Marek Szyprowski , Robin Murphy , Stephen Bates , Martin Oliveira Subject: Re: [PATCH v1 16/16] dma-mapping: Disallow .map_sg operations from returning zero on error Message-ID: <20210716063332.GD13345@lst.de> References: <20210715164544.6827-1-logang@deltatee.com> <20210715164544.6827-17-logang@deltatee.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210715164544.6827-17-logang@deltatee.com> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210715_233334_969266_6F4D8475 X-CRM114-Status: UNSURE ( 9.97 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Jul 15, 2021 at 10:45:44AM -0600, Logan Gunthorpe wrote: > @@ -194,6 +194,8 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, > else > ents = ops->map_sg(dev, sg, nents, dir, attrs); > > + WARN_ON_ONCE(ents == 0); Turns this into a negative error code while we're at it, just to keep the callers sane? _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel