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Wed, 13 May 2020 13:33:21 +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 v5 34/38] misc: fastrpc: fix common struct sg_table related issues Date: Wed, 13 May 2020 15:32:41 +0200 Message-Id: <20200513133245.6408-34-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200513133245.6408-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSe0hTURzHObu7u9ex5W0KHqwUJiZGqcOCS1oUhN0IIkIDDbWZ1we6Kbtq 2T+JYrj5Sk0ydSpqWD7STM3U8Jk6hysfmK80tbQUK3y3zNq80/77/j7n8zu/H4eDI6IW1BoP lUfRCrk0XMzjcxu6f+lOiDeb/Vymkx3JVJ2GQ/7J7MbIFznVKPm3IQMhh9d/8MiEkmoe+azi LYcsanUj14ZnOGTt3AhKDjXl88iqro8Y2f7zM3pOSFUWVALqtz4TUG82irjUq41PKNWqrsSo 6eQeDvWy9B41sTOHUFmjZYBqHovjUWl15YBarbW5KvDhuwfS4aExtML57E1+SG68HotMF935 ujWBxoGH5ipghkPiJExefI2oAB8XEU8B7J+fx9hiDcCmgXTAFqsA9mV0Ynstbcokk1UGYIm2 F9lvGZ4tQo0Wj5BA1bKKZ8yWRCKAvakCo4QQixxYkK/clSwIT5jfWGOQcJxL2MOq1SAjFhJn 4GzCEoedZgsratoQYzYz8MXJVq7xHkjoMFi80M9jpQtw6ks3wmYLuNhTZ1r1MNRmpZgaEgCc 0VVhbJEC4FB8DmAtNzip0+9ugRCOsLrJmcXnoWpdzzFiSByAo8sHjRgxxMyGRwiLhTDpvoi1 j8Lcnuf7Y9vfD5rWoWDXE6XpGTsBrN8c5D4Atrn/hxUBUA6s6GhGFkwzEjl924mRyphoebDT rQhZLTD8Ke1Oz0ojWB8M6AAEDsQCITne7CdCpTFMrKwDQBwRWwqvVBuQMFAae5dWRPgrosNp pgMcwrliK6Fr8TdfEREsjaLDaDqSVuydcnAz6zhgU/H4e5DttYBVv16vzaqNi14Owa6ppbZY UHOYJv/yBwEarWz0sTte4xEbC2e9004PSS75ZjFrfeqggfHrWdpw837obZ5IukTWF2aEZWuW 7CSeY+7beQteNxQr6nRBWOn4VosDMZE9kjd6PWrK44hmu9DT2t/uVGO22l7v9m5OzGVCpJJj iIKR/gOYlM9tTwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t/xu7pK33fHGXTu5rPoPXeSyeLvpGPs FhtnrGe1+L9tIrPFla/v2SyaF69ns1i5+iiTxYL91hZfrjxkstj0+BqrxeVdc9gs1h65y25x 8MMTVgdejzXz1jB6/P41idFj77cFLB7bvz1g9dg/dw27x/3u40wem5fUe9z+95jZY/KN5Ywe u282sHn0bVnF6PF5k1wAT5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJpZ6hsXmslZGpkr6d TUpqTmZZapG+XYJexqymX+wF/UIVL37cZm1gnMLfxcjJISFgInGgs4O9i5GLQ0hgKaPE6iXH 2SASMhInpzWwQtjCEn+udbFBFH1ilDi39TM7SIJNwFCi6y1EQkSgk1FiWvdHsFHMAp+YJI5c Ow02SlggSGLulElMXYwcHCwCqhJrP6eBhHkFbCUeNb9mgtggL7F6wwFmEJsTKP7qzn4WEFtI IF9i7+J9bBMY+RYwMqxiFEktLc5Nzy021CtOzC0uzUvXS87P3cQIjJptx35u3sF4aWPwIUYB DkYlHl6LW7vjhFgTy4orcw8xSnAwK4nw+q0HCvGmJFZWpRblxxeV5qQWH2I0BbppIrOUaHI+ MKLzSuINTQ3NLSwNzY3Njc0slMR5OwQOxggJpCeWpGanphakFsH0MXFwSjUwGlhOrvJftebF 40Qrl6Jn7UtSFiheqSgUNH0pcI57z5MPJdEFXQuWhnc59W6oTjv1WVdUuqWzaJXGHJ3tM5Pf PtvadmdVMYvus5Y1NStyDpb8u+jqaM3naZr2xFD3weSFp9JbOJP/Sb6v2LFF9ymratK9q6L3 fkxUyPV97eX7k8V+n2/fM76ZSizFGYmGWsxFxYkAFhuED7ACAAA= X-CMS-MailID: 20200513133322eucas1p19b55463a3926b7c1459034f2b02969f8 X-Msg-Generator: CA X-RootMTR: 20200513133322eucas1p19b55463a3926b7c1459034f2b02969f8 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200513133322eucas1p19b55463a3926b7c1459034f2b02969f8 References: <20200513132114.6046-1-m.szyprowski@samsung.com> <20200513133245.6408-1-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: Arnd Bergmann , Bartlomiej Zolnierkiewicz , David Airlie , Greg Kroah-Hartman , 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 --- For more information, see '[PATCH v5 00/38] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lore.kernel.org/linux-iommu/20200513132114.6046-1-m.szyprowski@samsung.com/T/ --- drivers/misc/fastrpc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index e3e085e..0b5b927 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -518,7 +518,7 @@ static struct fastrpc_invoke_ctx *fastrpc_context_alloc( table = &a->sgt; - if (!dma_map_sg(attachment->dev, table->sgl, table->nents, dir)) + if (!dma_map_sgtable(attachment->dev, table, dir, 0)) return ERR_PTR(-ENOMEM); return table; @@ -528,7 +528,7 @@ static void fastrpc_unmap_dma_buf(struct dma_buf_attachment *attach, struct sg_table *table, enum dma_data_direction dir) { - dma_unmap_sg(attach->dev, table->sgl, table->nents, dir); + dma_unmap_sgtable(attach->dev, table, dir, 0); } static void fastrpc_release(struct dma_buf *dmabuf)