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Fri, 19 Jun 2020 10:37:15 +0000 (GMT) From: Marek Szyprowski To: dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 33/36] rapidio: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:33 +0200 Message-Id: <20200619103636.11974-34-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200619103636.11974-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSa0hTYRjm27nsuJydpuCHVsIiQclrEYc0yZA43SCoP5qXlh7vOtucZf5w 6LRYGi0RdUhoCJrXvKSls1SsKeYUNZ2ppBmaec15wZma85j9e573fZ73efj4CETQhNkQEbHx jCRWFC3EeWj9p40eJ//suUBX/Ywdlanr5FDfS/UIVZ1bhVE79SqEGlhdxKlXZR85VMEHD2pl YIJD1UwOYlR/Yz5OVbSPcansnnWEal36gV3g0+UvygHdvFaA0u/UY1w6Y06B0Q1r4xj97YmW Q9cWJdMj25MInaUvBnTTsBynn9aVAtpQc/yGuR/PM4SJjkhgJC5ed3jhQ9OdnLgBwYNajRyT g67DSmBGQPIMXDcMcZSARwjIEgCbc8b3yQqAhpIanCUGAEe38rj/LLUNGxi7KAZQ2dENDixr hTOoSYWTblA5r8RN2IpMA7Aj09yEEXKBA9sNjiZsSV6DlcbNvasoeRLmbc7sXiUIPukF6zQo G2YHy163ICZstjueVbTuBUNSx4XbKW0IK/KBut40jMWW8Je2br/pUdiVlYGyhlQAJ3QVXJZk ANifkgtYlQcc1RlxUzJCOsCqRhd27A3fpGv2CkHSAurnj7D9LeDz+hyEHfPh43QBq7aHam3l QWxrb99+NRp+nZzdfywVgLmFy/gzYKf+H1YAQCmwZmTSmDBG6h7L3HeWimKkstgw52BxTA3Y /VJd29qVt6Dxz902QBJAaM7/eWs2UICJEqSJMW0AEojQin+xuytQwA8RJT5kJOIgiSyakbYB WwIVWvNPv5wJEJBhongmimHiGMm/LYcws5GDattB76lpK1wV1PIZr31/0789ams1NGl5RDzc qR5yvnxOvLy0Q/ks+vbhc4WeqCzclTjrpWpeKZMrkpNcnL4Izes3ppPpSHWrOO56ZLBDYWL0 lXn7qUcJRQG/85e5J3gL7saGdn3CvaRL7orQqw3MqfOpt/0OtRwzNvsqHFI0QlQaLnJzRCRS 0V/Z4WygTgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t/xe7oxU9/EGaw9y27Re+4kk8WjVTeY LTbOWM9q8X/bRGaLK1/fs1msXH2UyWLBfmuLL1ceMllsenyN1eLyrjlsFmuP3GW3mHr+O7PF wQ9PWB14PdbMW8PosffbAhaPnbPusnv0vGlh9dj+7QGrx/3u40wem5fUe9z+95jZY/KN5Ywe u282sHn0bVnF6PF5k1wAT5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJpZ6hsXmslZGpkr6d TUpqTmZZapG+XYJexvXnJ5kKrghVbN7TwNrAeJq/i5GTQ0LARGLz9p+sXYxcHEICSxklFrxc xQKRkJE4Oa2BFcIWlvhzrYsNougTo8STqbeYQBJsAoYSXW8hEiICnYwS07o/soM4zALfmCQm Lb3FBlIlLOAjse7Xb3YQm0VAVWLm75dAYzk4eAXsJLbsgdomL7F6wwFmEJsTKPy65SDYZiEB W4nlC94zT2DkW8DIsIpRJLW0ODc9t9hIrzgxt7g0L10vOT93EyMwarYd+7llB2PXu+BDjAIc jEo8vC9CXscJsSaWFVfmHmKU4GBWEuF1Ons6Tog3JbGyKrUoP76oNCe1+BCjKdBNE5mlRJPz gRGdVxJvaGpobmFpaG5sbmxmoSTO2yFwMEZIID2xJDU7NbUgtQimj4mDU6qB8ZDlDLNfl/Vb LtQHx95bLzf16aGWb5W6a0WSlVZslUqR8pv/5Hb7bqcoizWCWifeHBMJX20W/aD/fPwttzCt hOkxTxr+vbvBzjXntFpFSe2isLlnij9dsXbeHzhH6Olnx/7Luf2fuB3uHe2pnFD1p/pG/rSI G9bF2+frBTws8N81jU2HRzakQImlOCPRUIu5qDgRAL+/YhqwAgAA X-CMS-MailID: 20200619103716eucas1p1b7c50f7b421fb29829050b9355e3e644 X-Msg-Generator: CA X-RootMTR: 20200619103716eucas1p1b7c50f7b421fb29829050b9355e3e644 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103716eucas1p1b7c50f7b421fb29829050b9355e3e644 References: <20200619103636.11974-1-m.szyprowski@samsung.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bartlomiej Zolnierkiewicz , David Airlie , Alexandre Bounine , Matt Porter , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function returns the number of the created entries in the DMA address space. However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and dma_unmap_sg must be called with the original number of the entries passed to the dma_map_sg(). struct sg_table is a common structure used for describing a non-contiguous memory buffer, used commonly in the DRM and graphics subsystems. It consists of a scatterlist with memory pages and DMA addresses (sgl entry), as well as the number of scatterlist entries: CPU pages (orig_nents entry) and DMA mapped pages (nents entry). It turned out that it was a common mistake to misuse nents and orig_nents entries, calling DMA-mapping functions with a wrong number of entries or ignoring the number of mapped entries returned by the dma_map_sg() function. To avoid such issues, lets use a common dma-mapping wrappers operating directly on the struct sg_table objects and use scatterlist page iterators where possible. This, almost always, hides references to the nents and orig_nents entries, making the code robust, easier to follow and copy/paste safe. Signed-off-by: Marek Szyprowski --- drivers/rapidio/devices/rio_mport_cdev.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel Reported-by: kernel test robot diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index 451608e960a1..98c572627c8c 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -573,8 +573,7 @@ static void dma_req_free(struct kref *ref) refcount); struct mport_cdev_priv *priv = req->priv; - dma_unmap_sg(req->dmach->device->dev, - req->sgt.sgl, req->sgt.nents, req->dir); + dma_unmap_sgtable(req->dmach->device->dev, &req->sgt, req->dir, 0); sg_free_table(&req->sgt); if (req->page_list) { unpin_user_pages(req->page_list, req->nr_pages); @@ -930,9 +929,8 @@ rio_dma_transfer(struct file *filp, u32 transfer_mode, xfer->offset, xfer->length); } - nents = dma_map_sg(chan->device->dev, - req->sgt.sgl, req->sgt.nents, dir); - if (nents == 0) { + ret = dma_map_sgtable(chan->device->dev, &req->sgt, dir, 0); + if (ret) { rmcd_error("Failed to map SG list"); ret = -EFAULT; goto err_pg;