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Mon, 6 May 2019 13:49:35 +0000 (GMT) Subject: Re: [PATCH 2/7] au1100fb: fix DMA API abuse To: Christoph Hellwig Cc: Ralf Baechle , Paul Burton , James Hogan , Ley Foon Tan , Michal Simek , linux-mips@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org From: Bartlomiej Zolnierkiewicz Message-ID: <7a63eeae-4ec3-c82e-c497-8adc7bcb3cea@samsung.com> Date: Mon, 6 May 2019 15:49:35 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 MIME-Version: 1.0 In-Reply-To: <20190430110032.25301-3-hch@lst.de> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-Brightmail-Tracker: H4sIAAAAAAAAA01SbUhTYRjt3d3u7oaT69R8UDEclhBpChHXDLGQuNWfsD9hUq28qOQ223Wa FeWPLJ0wv/qwYWiCmotU5rdl5pxT8Ss1TNNIUUuUqamRRbPc7gT/ned5znnPOfASmPSdwJtI VKYwaqU8SYaL+Y2W34NBN8I/xIbM6MVU1asuHlXaHk7l96zxqfm8KZzq0a0KqNHWYpzKNjYg au5HH5/SLVkwauRtQKSYzmzLw2mjIRunu6pe8+jC8UpEv5nIwOkl8wyftmkfYfS60e8cESM+ HsckJaYy6sMRV8QJQ4XlWPIX7GZ2bYMwA+VgWiQigDwC3ZkdSIvEhJR8iUA3bMO4YQOB2fgC 54Z1BA35Y2hHMlm0IeQOlQj6LctOiRXB/WUDz85y32Y1Fm86FB6kDOYXBxwmGFnNA52uwHHA yWOQ/9DgwBIyAuYraoR2zCcD4Ilet/0qQXiSFyC3P5CjuEHvszm+HYvIEChvNgnsGNvG5rJi J94HTdZiRyAgB4XwuE0n5GJHQVO93tnaHRa76517X/jXUsLjBNUIbFkLTnUTgsrCLZxjhUNn 97CAwyfgY2cubk8HpCuMW904Z1coaHyKcWsJZD2QcuwDUFtRi+94aVuqnBloaF+14HnIX7+r m35XH/2uPqUIMyAvRsMq4hk2VMmkBbNyBatRxgdfUymMaPtX9W11rzWjnyNXTYgkkMxFQsuG YqUCeSqbrjAhIDCZh0T+bTBWKomTp99i1KrLak0Sw5qQD8GXeUlu75m+KCXj5SnMdYZJZtQ7 Vx4h8s5Ap7UTM12ncqyW53H5nr6rQUWj/X+ss6k8ZB5pvZOoEb03hbXaPvkrL9kCzTAW0VO2 d2tlUVpEbqoUX3tZ3hwznZVWM5F1MsHlrndUmI/qlzRvtrpSbfz+OW2/nzJacL76TMzkvbMr qZF/ZVMLqujpuoWOAYXKfMgMJeV1RzUyPpsgDz2IqVn5f8RVZkNRAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrEIsWRmVeSWpSXmKPExsVy+t/xe7oF1hdiDD5/FbFYufook8WC/dYW E098YrF4OuEOm8WJvg+sFpd3zWGz6Ny0ldHiycfTLBZ9r48xW1zao+LA5dG6dwKbx6ZVnWwe R1euZfKYfGM5o8fumw1sHq+PPGTx+Ns1hdnj8ya5AI4oPZui/NKSVIWM/OISW6VoQwsjPUNL Cz0jE0s9Q2PzWCsjUyV9O5uU1JzMstQifbsEvYzzk5cyF9xlrujcsJW9gbGbuYuRk0NCwETi 9owv7F2MXBxCAksZJU5vPcTWxcgBlJCROL6+DKJGWOLPtS42iJrXjBJv921mBEkIAzVvm/MD zBYRUJJ4+uosI0TRSkaJxf/OsIA4zALrmCRaTs0Bq2ITsJKY2L4KzOYVsJN4umw9O4jNIqAi MW1WH9hJogIRErcedrBA1AhKnJz5BMzmFDCQWLrjECuIzSygJ7Hj+i8oW15i+9s5zBMYBWch aZmFpGwWkrIFjMyrGEVSS4tz03OLjfSKE3OLS/PS9ZLzczcxAuNv27GfW3Ywdr0LPsQowMGo xMProXQ+Rog1say4MvcQowQHs5IIb+KzczFCvCmJlVWpRfnxRaU5qcWHGE2BnpjILCWanA9M DXkl8YamhuYWlobmxubGZhZK4rwdAgdjhATSE0tSs1NTC1KLYPqYODilGhhTCi9XsvsLf3Ps dAw7oqGvrl3fYZuq4P5NL/XZV/U/S69P3vzomrDV3/mRZUUGj3n+v44/uT4l8Pf0T3FlT05O f+t3+VVL561lPI9/5LP9PHx6XfP8I7d+MW9rXMMZf0rqrvzt6cdZpPZG86jnmt/wYa8025MX 9MTuV80qE6n2F48NZFoDufcqsRRnJBpqMRcVJwIAhi4zqNUCAAA= X-CMS-MailID: 20190506134936eucas1p2bc1a530cb7ec454d489f04c1d17a1747 X-Msg-Generator: CA X-RootMTR: 20190430110118epcas2p24019c7551331cc6390e5b5e07b381dd9 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20190430110118epcas2p24019c7551331cc6390e5b5e07b381dd9 References: <20190430110032.25301-1-hch@lst.de> <20190430110032.25301-3-hch@lst.de> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/30/2019 01:00 PM, Christoph Hellwig wrote: > Virtual addresses return from dma(m)_alloc_coherent are opaque in what > backs then, and drivers must not poke into them. Switch the driver > to use the generic DMA API mmap helper to avoid these games. > > Signed-off-by: Christoph Hellwig Acked-by: Bartlomiej Zolnierkiewicz Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics