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Tue, 28 Apr 2020 13:20:30 +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 15/17] drm: xen: fix sg_table nents vs. orig_nents misuse Date: Tue, 28 Apr 2020 15:20:03 +0200 Message-Id: <20200428132005.21424-16-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200428132005.21424-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSaUwTQRzFM7vtdqktroWECRDRGiASuaIkk2A4IsY1xsgX/WAUrLIBhBZs KYqJAeqFBeT0iFyNitw3FgQMh2AFIhpADgWRQwIEULlUEkCWBfz2/m/ey+8/kyFxST3fnAxU hDFKhSxYSgh5+rd/P9hn2ef6OPVn2qH4jlYMZZdEC1DZ4xI+0jS1EWhNn4Sj7sUfBMoraMFQ WmIFhnT1rmihexhD5aM9fNRVk06gouZBAWr8OcZHbYPzAo+ddGFmIaBfL+l49EBPHUFXLX3j 00OxBoyueB5Jf1kdxemUvhxA1/ZHEfT9ynxAz5fv9t5xVnjYjwkODGeUjm4XhAGGhHsgNI28 Nv7SPgosElpgRELqENTqNbgWCEkJlQtg6vAE4IYFANs7FjA2JaHmASy8K91qrDz6hHGhHAAf 5n8mthsPJqoAmyIoZ6id0W4wTKnbAL6LF7EhnNLjcCynWaAFJGlCHYNz09ZshkdZw55K1jYi xZQbnH32C3A0K1hQ2oCz2mjdzx75vgGDVKcAVkx83byEFxyq+SPgtAmcMlRuaku49ioL4wo3 ARzuKBJwQxyAXZrHmwhXONCxTLAb4dR+WFLjyNmesK4hF2dtSBnDvpldrI2vy2T9o01bDGPu SLi0DXxiKN7GNn7sxDlNw6yUHj73QEkAtsX0E4nA6sl/mA6AfGDGqFVyf0blrGCuOqhkcpVa 4e9wKUReDta/VfuqYa4aLHZebAIUCaQicako10fCl4WrIuRNAJK41FQ8EvDCRyL2k0VcZ5Qh vkp1MKNqAhYkT2omPvh08ryE8peFMUEME8oot04x0sg8Cpzhtdo7eaVqimJFxdNxJ9J/tziV 2YAMMi3Pwta/68iSZYQ6UusZJkz3Q0g+F+0bc17z5vKyotGlROK+WLt3NlkYu6+YMNYd9xm8 Ye3av+dUoUXQZIhNu4uHVe/KyQwzpfpAqJ1373uR4EW2+5T5UdME3bl91bdqTicH2F4ZP+ks 5akCZM52uFIl+wfy1I6pUgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrAIsWRmVeSWpSXmKPExsVy+t/xe7rzdVfEGbS8FbLoPXeSyWLp+kZ2 i40z1rNaNB06xWbxf9tEZosrX9+zWaxcfZTJYvaEzUwWC/ZbW3y58pDJYtPja6wWl3fNYbNY e+Quu8XBD09YLU7d/czuwO+xZt4aRo+93xaweNy5tofNY/u3B6we97uPM3lsXlLvcfvfY2aP yTeWM3rsvtnA5tG3ZRWjx+dNcgHcUXo2RfmlJakKGfnFJbZK0YYWRnqGlhZ6RiaWeobG5rFW RqZK+nY2Kak5mWWpRfp2CXoZx/s7GQtmc1Q826rbwPiVrYuRk0NCwETi7/SrTF2MXBxCAksZ JQ4s2M4EkZCRODmtgRXCFpb4c62LDaLoE6PExBWLwbrZBAwlut5CJEQEOhklpnV/ZAdxmAUO MEt0nz8JNIqDQ1jAXeLTG1WQBhYBVYlrW46wg9i8AnYS7xZ/ZITYIC+xesMBZhCbEyi+9NFT NpBWIQFbicstuRMY+RYwMqxiFEktLc5Nzy021CtOzC0uzUvXS87P3cQIjJ1tx35u3sF4aWPw IUYBDkYlHt4NPCvihFgTy4orcw8xSnAwK4nwPspYFifEm5JYWZValB9fVJqTWnyI0RToponM UqLJ+cC4ziuJNzQ1NLewNDQ3Njc2s1AS5+0QOBgjJJCeWJKanZpakFoE08fEwSnVwKhR+57j csKto0w5yndivDgWVBru4nzg02oV+e3A2cS/gVWPpx+98b/P3Prjvtw+ebvAHHPFh78S9oqe vj7TY4/2WZfvrz1PVJ0/VXWd+/Dr7FY2F0ezi6e2q+Sx/zx9r53BlN3by+Uwh7Dy7embYwOU b5bp9Euf7peQPXRlk2P3M5lOl4ASUSWW4oxEQy3mouJEAEbx8fSzAgAA X-CMS-MailID: 20200428132031eucas1p1e7a72bf0de5acea2af652cd8337a8ed5 X-Msg-Generator: CA X-RootMTR: 20200428132031eucas1p1e7a72bf0de5acea2af652cd8337a8ed5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200428132031eucas1p1e7a72bf0de5acea2af652cd8337a8ed5 References: <20200428132005.21424-1-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: Bartlomiej Zolnierkiewicz , David Airlie , intel-gfx@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, Christoph Hellwig , Robin Murphy , 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 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/xen/xen_drm_front_gem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 1.9.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index f0b85e0..ba4bdc5 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -215,7 +215,7 @@ struct drm_gem_object * return ERR_PTR(ret); DRM_DEBUG("Imported buffer of size %zu with nents %u\n", - size, sgt->nents); + size, sgt->orig_nents); return &xen_obj->base; }