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(GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200428132027eusmtrp1b8816ccb4cde4d447caa4a031d06fa5b~J-l8AjGCn1743317433eusmtrp1z; Tue, 28 Apr 2020 13:20:27 +0000 (GMT) X-AuditID: cbfec7f4-0e5ff7000001ed07-9a-5ea82d9c9b9d Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id 7E.96.08375.B9D28AE5; Tue, 28 Apr 2020 14:20:27 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200428132026eusmtip2dabf1824e2aabc8f7023ced4cd9531a2~J-l7ZkcxN1116911169eusmtip2W; Tue, 28 Apr 2020 13:20:26 +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: [RFC 09/17] drm: panfrost: fix sg_table nents vs. orig_nents misuse Date: Tue, 28 Apr 2020 15:19:57 +0200 Message-Id: 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Benjamin Gaignard , Robin Murphy , Sumit Semwal , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 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/gpu/drm/panfrost/panfrost_gem.c | 3 ++- drivers/gpu/drm/panfrost/panfrost_mmu.c | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c index 17b654e..22fec7c 100644 --- a/drivers/gpu/drm/panfrost/panfrost_gem.c +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c @@ -42,7 +42,8 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj) for (i = 0; i < n_sgt; i++) { if (bo->sgts[i].sgl) { dma_unmap_sg(pfdev->dev, bo->sgts[i].sgl, - bo->sgts[i].nents, DMA_BIDIRECTIONAL); + bo->sgts[i].orig_nents, + DMA_BIDIRECTIONAL); sg_free_table(&bo->sgts[i]); } } diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index ed28aeb..2d9b1f9 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -517,7 +517,9 @@ static int panfrost_mmu_map_fault_addr(struct panfrost_device *pfdev, int as, if (ret) goto err_pages; - if (!dma_map_sg(pfdev->dev, sgt->sgl, sgt->nents, DMA_BIDIRECTIONAL)) { + sgt->nents = dma_map_sg(pfdev->dev, sgt->sgl, sgt->orig_nents, + DMA_BIDIRECTIONAL); + if (!sgt->nents) { ret = -EINVAL; goto err_map; }