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charset="us-ascii" Content-Transfer-Encoding: 7bit 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. Fix the code to refer to proper nents or orig_nents entries. This driver checks for a buffer contiguity in DMA address space, so it should test sg_table->nents entry. 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/gpu/drm/omapdrm/omap_gem.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c index c259411..cbcb361 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -48,7 +48,7 @@ struct omap_gem_object { * OMAP_BO_MEM_DMA_API flag set) * * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set) - * if they are physically contiguous (when sgt->orig_nents == 1) + * if they are physically contiguous (when sgt->nents == 1) * * - buffers mapped through the TILER when dma_addr_cnt is not zero, in * which case the DMA address points to the TILER aperture @@ -1279,7 +1279,7 @@ struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size, union omap_gem_size gsize; /* Without a DMM only physically contiguous buffers can be supported. */ - if (sgt->orig_nents != 1 && !priv->has_dmm) + if (sgt->nents != 1 && !priv->has_dmm) return ERR_PTR(-EINVAL); gsize.bytes = PAGE_ALIGN(size); @@ -1293,7 +1293,7 @@ struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size, omap_obj->sgt = sgt; - if (sgt->orig_nents == 1) { + if (sgt->nents == 1) { omap_obj->dma_addr = sg_dma_address(sgt->sgl); } else { /* Create pages list from sgt */ -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel