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(GMT) Received: from eusmgms1.samsung.com (unknown [182.198.249.179]) by eusmtrp1.samsung.com (KnoxPortal) with ESMTP id 20200505084637eusmtrp10bd85c1ae40dc41b984d18a142bc75ac~MFX2d2rLe0969509695eusmtrp1D; Tue, 5 May 2020 08:46:37 +0000 (GMT) X-AuditID: cbfec7f2-ef1ff7000001ef66-bd-5eb127ee01b8 Received: from eusmtip1.samsung.com ( [203.254.199.221]) by eusmgms1.samsung.com (EUCPMTA) with SMTP id 70.24.08375.DE721BE5; Tue, 5 May 2020 09:46:37 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip1.samsung.com (KnoxPortal) with ESMTPA id 20200505084637eusmtip141ccbb722e7764196913fe16c0e77997~MFX15Hfo30686606866eusmtip1O; Tue, 5 May 2020 08:46:37 +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 v3 23/25] rapidio: fix common struct sg_table related issues Date: Tue, 5 May 2020 10:46:12 +0200 Message-Id: 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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 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/rapidio/devices/rio_mport_cdev.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c index 4029637..df7dba8 100644 --- a/drivers/rapidio/devices/rio_mport_cdev.c +++ b/drivers/rapidio/devices/rio_mport_cdev.c @@ -574,8 +574,7 @@ static void dma_req_free(struct kref *ref) struct mport_cdev_priv *priv = req->priv; unsigned int i; - 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); sg_free_table(&req->sgt); if (req->page_list) { for (i = 0; i < req->nr_pages; i++) @@ -927,9 +926,8 @@ static int do_dma_request(struct mport_dma_req *req, 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); + if (ret) { rmcd_error("Failed to map SG list"); ret = -EFAULT; goto err_pg;