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Tue, 5 May 2020 08:46:33 +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 Cc: Marek Szyprowski , Christoph Hellwig , Robin Murphy , Bartlomiej Zolnierkiewicz , linux-arm-kernel@lists.infradead.org, David Airlie , Daniel Vetter , Mauro Carvalho Chehab , Laurent Pinchart , Kieran Bingham , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH v3 18/25] drm: rcar-du: fix common struct sg_table related issues Date: Tue, 5 May 2020 10:46:07 +0200 Message-Id: <20200505084614.30424-18-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200505084614.30424-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0VSe0hTYRztu3f37ipOrtP0Q0Nr9CAhTY24spIkqUsFCv1RCGlLr1N0Uza1 VKJhKs5H+CCbFmHh++18lE7xgTZNGuELLR/TWaDhI2emIprzqv13fud3zu8cPj4C5fdh9kSY NJqRSUURAtyc0/xpU3dh4Vx9wMX83ctUpq4foepVtRi125yNUsN/lnGqvLIXoQo7hNTqaDqg lNlFXGpteAah1IZRjBpqfYNTGXVNGNU0v4RQ1T2TXKpEvY1QXStz2DWSrnpbBej29UIO/To1 H6PVFUqc/rCux+jpdC1CNxQ9o7/vGFA6d6wU0JpxBU6/aKwAtFHt6Gfhb34lmIkIi2Vkrl4P zUNbNLeipsknwzlCBcizTANmBCQvwaSsUk4aMCf4ZBmAZQ3JODusAdhXn4yygxHA3hINfmjp L9cfLEoBLFhqw44sFd9SuSYVTrrBtMW0fYcNmbx3K9PCJELJbRQm/TLdJQhr8i5sf+lgghzy DGxJSTDJeaQX1I02ImyYE6ys60RN2GyPNwxO7NeD5BQXGhNrDhr5wE717AG2hgvaRi6LT8CB 3AwOa3gO4IyumssOGQAOJaoAqxLCCd0WbmqBkudhbasrS3vDlVnVPg1JSzi2aGWi0T2Y0/wK ZWkeTE3hs+qzsEBbcxTb9XUQZTEN9fofgH2fXgCLN5XcLOBU8D+sEIAKYMfEyCViRu4uZR67 yEUSeYxU7BIUKVGDvf81sKNd+whatx91A5IAAgvefWNtAB8TxcrjJN0AEqjAhleyURfA5wWL 4uIZWWSgLCaCkXcDB4IjsON5vJ9/wCfFomgmnGGiGNnhFiHM7BWgSD+y4uPhu5TTjt5715eU P1Ta/cVqcHq5JyTcc+TOcc0NR7/PsqncBJWz61OlU+DVk6ktUVnt7prQ28U1bTvW173H8m7a i4OmV1ulc6ij0HemJyFjpuFnwVAAlM7ZbJ3KmTS62P6WbZxGbBVSjZUz8BQf84fxIVmgwzCu dfor4MhDRW7OqEwu+gcVeaL4WwMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrJIsWRmVeSWpSXmKPExsVy+t/xu7qv1DfGGay6I2LRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8elaN6NF58Ql7BZfrjxkstj0+BqrxeVdc9gsejZsZbXY +vIdk8XaI3fZLZZt+sNkcfDDE1YHAY8189Yweuz9toDFY3bHTFaPTas62Ty2f3vA6nG/+ziT x+Yl9R63/z1m9ph8Yzmjx+6bDWwefVtWMXp83iQXwBOlZ1OUX1qSqpCRX1xiqxRtaGGkZ2hp oWdkYqlnaGwea2VkqqRvZ5OSmpNZllqkb5egl7Fzt1fBfYGKK5OsGxin8XUxcnJICJhInFz5 gBnEFhJYyihxdz43RFxG4uS0BlYIW1jiz7Uuti5GLqCaT4wSd87eYQNJsAkYSnS9hUiICHQy Skzr/sgO4jALtLBILO25DtYuLBAosa/7BJDNwcEioCqxs60aJMwrYCdx7toWJogN8hKrNxwA u4ITKP74EsQCIYFCiQ/nv7NOYORbwMiwilEktbQ4Nz232EivODG3uDQvXS85P3cTIzCath37 uWUHY9e74EOMAhyMSjy8G76ujxNiTSwrrsw9xCjBwawkwrvsx4Y4Id6UxMqq1KL8+KLSnNTi Q4ymQDdNZJYSTc4HRnpeSbyhqaG5haWhubG5sZmFkjhvh8DBGCGB9MSS1OzU1ILUIpg+Jg5O qQbGa+t5C1pub5nEF8C18XKowK6j8Z3vvzgrnmne6rw3UzLh0Prw/tV+c6a4zbpyoeyix9t1 zVMcZicGHdw2JXjv5Hm2e6s+7n2jVOWZGXT41y7X/8b/eVOPftp2/sry255/tK0mKv47XZX9 YW97tP4Ei6PvhJZ3TYya/npHk19fuHloichtzzlb25RYijMSDbWYi4oTAS4gPqG8AgAA X-CMS-MailID: 20200505084634eucas1p1e0ea160dd77afbf6d2f7e6154ded40d0 X-Msg-Generator: CA X-RootMTR: 20200505084634eucas1p1e0ea160dd77afbf6d2f7e6154ded40d0 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200505084634eucas1p1e0ea160dd77afbf6d2f7e6154ded40d0 References: <20200505083926.28503-1-m.szyprowski@samsung.com> <20200505084614.30424-1-m.szyprowski@samsung.com> Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 the 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. A common mistake was to ignore a result of the dma_map_sg function and don't use the sg_table->orig_nents at all. To avoid such issues, lets use common dma-mapping wrappers operating directly on the struct sg_table objects and adjust references to the nents and orig_nents respectively. Signed-off-by: Marek Szyprowski --- For more information, see '[PATCH v3 00/25] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/5/187 --- drivers/media/platform/vsp1/vsp1_drm.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/media/platform/vsp1/vsp1_drm.c b/drivers/media/platform/vsp1/vsp1_drm.c index a4a45d6..8a2624b 100644 --- a/drivers/media/platform/vsp1/vsp1_drm.c +++ b/drivers/media/platform/vsp1/vsp1_drm.c @@ -912,8 +912,9 @@ int vsp1_du_map_sg(struct device *dev, struct sg_table *sgt) * skip cache sync. This will need to be revisited when support for * non-coherent buffers will be added to the DU driver. */ - return dma_map_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents, - DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); + return dma_map_sgtable_attrs(vsp1->bus_master, sgt, DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); + return sgt->nents; } EXPORT_SYMBOL_GPL(vsp1_du_map_sg); @@ -921,8 +922,8 @@ void vsp1_du_unmap_sg(struct device *dev, struct sg_table *sgt) { struct vsp1_device *vsp1 = dev_get_drvdata(dev); - dma_unmap_sg_attrs(vsp1->bus_master, sgt->sgl, sgt->nents, - DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC); + dma_unmap_sgtable_attrs(vsp1->bus_master, sgt, DMA_TO_DEVICE, + DMA_ATTR_SKIP_CPU_SYNC); } EXPORT_SYMBOL_GPL(vsp1_du_unmap_sg);