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=-13.6 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,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 934C9C433E6 for ; Tue, 1 Sep 2020 20:24:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6F023206FA for ; Tue, 1 Sep 2020 20:24:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728419AbgIAUYu (ORCPT ); Tue, 1 Sep 2020 16:24:50 -0400 Received: from foss.arm.com ([217.140.110.172]:49856 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726326AbgIAUYt (ORCPT ); Tue, 1 Sep 2020 16:24:49 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3BAF91063; Tue, 1 Sep 2020 13:24:49 -0700 (PDT) Received: from [10.57.40.122] (unknown [10.57.40.122]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 5C94E3F66F; Tue, 1 Sep 2020 13:24:47 -0700 (PDT) Subject: Re: [PATCH v9 31/32] media: pci: fix common ALSA DMA-mapping related codes To: Marek Szyprowski , dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Cc: Christoph Hellwig , Bartlomiej Zolnierkiewicz , linux-arm-kernel@lists.infradead.org, David Airlie , Daniel Vetter , Mauro Carvalho Chehab , linux-media@vger.kernel.org References: <20200826063316.23486-1-m.szyprowski@samsung.com> <20200826063316.23486-32-m.szyprowski@samsung.com> From: Robin Murphy Message-ID: <925232f3-7371-c7eb-ad31-4b041cbbca4f@arm.com> Date: Tue, 1 Sep 2020 21:24:46 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <20200826063316.23486-32-m.szyprowski@samsung.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-08-26 07:33, Marek Szyprowski wrote: > The Documentation/DMA-API-HOWTO.txt states that dma_map_sg returns the > numer of the created entries in the DMA address space. However the > subsequent calls to dma_sync_sg_for_{device,cpu} and dma_unmap_sg must be > called with the original number of entries passed to dma_map_sg. The > sg_table->nents in turn holds the result of the dma_map_sg call as stated > in include/linux/scatterlist.h. Adapt the code to obey those rules. > > Signed-off-by: Marek Szyprowski > --- > drivers/media/pci/cx23885/cx23885-alsa.c | 2 +- > drivers/media/pci/cx25821/cx25821-alsa.c | 2 +- > drivers/media/pci/cx88/cx88-alsa.c | 2 +- > drivers/media/pci/saa7134/saa7134-alsa.c | 2 +- > 4 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/pci/cx23885/cx23885-alsa.c b/drivers/media/pci/cx23885/cx23885-alsa.c > index df44ed7393a0..3f366e4e4685 100644 > --- a/drivers/media/pci/cx23885/cx23885-alsa.c > +++ b/drivers/media/pci/cx23885/cx23885-alsa.c > @@ -129,7 +129,7 @@ static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev) > if (!buf->sglen) > return 0; > > - dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); > + dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, PCI_DMA_FROMDEVICE); If we're touching these lines anyway, we should update them to use the modern DMA_FROM_DEVICE definitions too. Robin. > buf->sglen = 0; > return 0; > } > diff --git a/drivers/media/pci/cx25821/cx25821-alsa.c b/drivers/media/pci/cx25821/cx25821-alsa.c > index 301616426d8a..c40304d33776 100644 > --- a/drivers/media/pci/cx25821/cx25821-alsa.c > +++ b/drivers/media/pci/cx25821/cx25821-alsa.c > @@ -193,7 +193,7 @@ static int cx25821_alsa_dma_unmap(struct cx25821_audio_dev *dev) > if (!buf->sglen) > return 0; > > - dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE); > + dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, PCI_DMA_FROMDEVICE); > buf->sglen = 0; > return 0; > } > diff --git a/drivers/media/pci/cx88/cx88-alsa.c b/drivers/media/pci/cx88/cx88-alsa.c > index 7d7aceecc985..3c6fe6ceb0b7 100644 > --- a/drivers/media/pci/cx88/cx88-alsa.c > +++ b/drivers/media/pci/cx88/cx88-alsa.c > @@ -332,7 +332,7 @@ static int cx88_alsa_dma_unmap(struct cx88_audio_dev *dev) > if (!buf->sglen) > return 0; > > - dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, > + dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, > PCI_DMA_FROMDEVICE); > buf->sglen = 0; > return 0; > diff --git a/drivers/media/pci/saa7134/saa7134-alsa.c b/drivers/media/pci/saa7134/saa7134-alsa.c > index 544ca57eee75..398c47ff473d 100644 > --- a/drivers/media/pci/saa7134/saa7134-alsa.c > +++ b/drivers/media/pci/saa7134/saa7134-alsa.c > @@ -313,7 +313,7 @@ static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev) > if (!dma->sglen) > return 0; > > - dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->sglen, PCI_DMA_FROMDEVICE); > + dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->nr_pages, PCI_DMA_FROMDEVICE); > dma->sglen = 0; > return 0; > } >