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Wed, 26 Aug 2020 06:35:44 +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 v9 28/32] misc: fastrpc: fix common struct sg_table related issues Date: Wed, 26 Aug 2020 08:33:12 +0200 Message-Id: <20200826063316.23486-29-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200826063316.23486-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrLKsWRmVeSWpSXmKPExsWy7djP87oHmdziDQ61cVr0njvJZPF30jF2 i40z1rNa/N82kdniytf3bBbNi9ezWaxcfZTJYsF+a4svVx4yWWx6fI3V4vKuOWwWa4/cZbc4 +OEJqwOvx5p5axg9fv+axOix99sCFo/t3x6weuyfu4bd4373cSaPzUvqPW7/e8zsMfnGckaP 3Tcb2Dz6tqxi9Pi8SS6AJ4rLJiU1J7MstUjfLoEro+3sfdaCKwIV17/fZWlg/MDbxcjJISFg IrF4xx3mLkYuDiGBFYwSaz/dYoJwvjBKrFz8kA3C+cwoMf9uIwtMy57nU6CqljNKnP1xgx2u 5e+KS8wgVWwChhJdb7vYQGwRgVZGiRO9PCBFzAKvmCTmzelkBUkIC4RInDx8DayBRUBVomUi RJxXwE7i5MQJ7BDr5CVWbzgAVsMJFD/e3Q92k4TAKXaJ6XtXM0MUuUgcevGKDcIWlnh1fAtU s4zE/53zmSAamhklHp5byw7h9DBKXG6awQhRZS1x59wvoG4OoPs0Jdbv0ocIO0pcmPSfBSQs IcAnceOtIEiYGcictG06M0SYV6KjTQiiWk1i1vF1cGsPXrgEdZqHxPEFP6HhOJFR4sLJKywT GOVnISxbwMi4ilE8tbQ4Nz212CgvtVyvODG3uDQvXS85P3cTIzBRnf53/MsOxl1/kg4xCnAw KvHwLmBzjRdiTSwrrsw9xCjBwawkwut09nScEG9KYmVValF+fFFpTmrxIUZpDhYlcV7jRS9j hQTSE0tSs1NTC1KLYLJMHJxSDYwcjaaBfdVx2hfyK7vfTuy98fbeA2ae5bEK3w58DZedZ29V OuOytvvmO+mcXA1pa5o/HJtR1b0wX9x006HoRbF356549FbdZX2h+Ns3Hd3aemfbH4kKmS1L 3pDjo7LsSVnqmoquM1unNn+MdhCY9VQn5V5MVlz3t3eFr1VtROT+zG1kN0qsfqXEUpyRaKjF XFScCADsbkboUAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t/xe7oHmNziDbYe0bfoPXeSyeLvpGPs FhtnrGe1+L9tIrPFla/v2SyaF69ns1i5+iiTxYL91hZfrjxkstj0+BqrxeVdc9gs1h65y25x 8MMTVgdejzXz1jB6/P41idFj77cFLB7bvz1g9dg/dw27x/3u40wem5fUe9z+95jZY/KN5Ywe u282sHn0bVnF6PF5k1wAT5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJpZ6hsXmslZGpkr6d TUpqTmZZapG+XYJeRtvZ+6wFVwQqrn+/y9LA+IG3i5GTQ0LARGLP8ylMILaQwFJGiU07mSHi MhInpzWwQtjCEn+udbF1MXIB1XxilNh2/wxYA5uAoUTXW4iEiEAno8S07o/sIA6zwCcmiSPX TrOBVAkLBEksP7sUbCyLgKpEy8ROsLG8AnYSJydOYIdYIS+xesMBsBpOoPjx7n42iJNsJU6v ncE8gZFvASPDKkaR1NLi3PTcYiO94sTc4tK8dL3k/NxNjMCo2Xbs55YdjF3vgg8xCnAwKvHw LmBzjRdiTSwrrsw9xCjBwawkwut09nScEG9KYmVValF+fFFpTmrxIUZToKMmMkuJJucDIzqv JN7Q1NDcwtLQ3Njc2MxCSZy3Q+BgjJBAemJJanZqakFqEUwfEwenVANjf2aO2lyrHUKqn2Y1 XT4jKsxWLPiRY+4S9pd8i1+WxsfKsYVHOq+1PR8cfIfvr9qMyEnxuh+09N5vD1nfov55i+l8 Ba8TbYU6gb2TGsx/XBXR/npO7tLXsDdm5YU/Z//RDQjcEN1yaGnTF68VP033HXucW3bx7+e9 6pc8lzpZ/poVKZY3u/KREktxRqKhFnNRcSIAobSgz7ACAAA= X-CMS-MailID: 20200826063544eucas1p15980885bbdbc43e35f350f228994bee7 X-Msg-Generator: CA X-RootMTR: 20200826063544eucas1p15980885bbdbc43e35f350f228994bee7 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200826063544eucas1p15980885bbdbc43e35f350f228994bee7 References: <20200826063316.23486-1-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 --- drivers/misc/fastrpc.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) -- 2.17.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel Reviewed-by: Robin Murphy diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c index 7939c55daceb..9d6867749316 100644 --- a/drivers/misc/fastrpc.c +++ b/drivers/misc/fastrpc.c @@ -518,7 +518,7 @@ fastrpc_map_dma_buf(struct dma_buf_attachment *attachment, 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)