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Fri, 30 Jul 2021 06:15:52 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=X/PGh6GTfJ6ZdtihVioh5gR+sLDdDHokoaBTKsSS/Sc=; b=Cl0pwajPUF0MbvvK+bH3m8G15c iHGMTRHjC70auqPKPrfU/+fnjiDq8xpUMiFyYl3bcXjcpeMj0bAqbgfhD+GY9+ktWOOjLziknbBpV eOrDDhbu2P6PbvlVWSvYgPEnlp2BricnQaa43UTkbJu+XUYXR7je7h3vqOKBtF35iiPZChQvy2Y6T SQk28+qNruG/mX+ypm5KCA5pmv+A8RtK+979e9bCfNDpbieX0+q4/AvvQXFkzgOrHSbjqtMqcmzC3 ChuWTdKg/GFTa5IPAkYTKqDInd6tjgcT2Sy8uBUU77cbYGKw3nkXhBa/lC9mrNgps7kOEZnUPfeL7 SViD+cFQ==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m9CRZ-0008VM-Dl; Thu, 29 Jul 2021 14:15:50 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1m9CRW-0001UQ-LZ; Thu, 29 Jul 2021 14:15:46 -0600 From: Logan Gunthorpe To: 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 Date: Thu, 29 Jul 2021 14:15:39 -0600 Message-Id: <20210729201539.5602-22-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210729201539.5602-1-logang@deltatee.com> References: <20210729201539.5602-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-parisc@vger.kernel.org, xen-devel@lists.xenproject.org, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, sbates@raithlin.com, martin.oliveira@eideticom.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 21/21] dma-mapping: Disallow .map_sg operations from returning zero on error X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Robin Murphy , Martin Oliveira , Stephen Bates , Logan Gunthorpe , Christoph Hellwig , Marek Szyprowski Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Now that all the .map_sg operations have been converted to returning proper error codes, drop the code to handle a zero return value, add a warning if a zero is returned. Signed-off-by: Logan Gunthorpe --- kernel/dma/mapping.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 9f0bb56eb9aa..cbcbdc877458 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -196,8 +196,8 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, if (ents > 0) debug_dma_map_sg(dev, sg, nents, ents, dir); - else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM && - ents != -EIO && ents != 0)) + else if (WARN_ON_ONCE((ents != -EINVAL && ents != -ENOMEM && + ents != -EIO) || ents == 0)) return -EIO; return ents; @@ -262,9 +262,7 @@ int dma_map_sgtable(struct device *dev, struct sg_table *sgt, int nents; nents = __dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs); - if (nents == 0) - return -EIO; - else if (nents < 0) + if (nents < 0) return nents; sgt->nents = nents; -- 2.20.1