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Mon, 4 May 2020 12:54:19 +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 v2 15/21] drm: xen: fix sg_table nents vs. orig_nents misuse Date: Mon, 4 May 2020 14:53:53 +0200 Message-Id: <20200504125359.5678-15-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200504125359.5678-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrJKsWRmVeSWpSXmKPExsWy7djP87o1AhviDBruaVj0njvJZLFxxnpW i//bJjJbXPn6ns1i5eqjTBYL9ltbfLnykMli0+NrrBaXd81hs1h75C67xYfV71ktDn54wmrx fctkJgdejzXz1jB63Fm6k9Fj77cFLB7bvz1g9bjffZzJY/OSeo/b/x4ze0y+sZzR4/CHKywe u282sHn0bVnF6PF5k1wATxSXTUpqTmZZapG+XQJXxvlZL9kK1nNWPN7Uw97A+IW9i5GDQ0LA ROLfQeYuRi4OIYEVjBJvW98AxTmBnC+MErcemkEkPjNK7G14ANdw/qg3RHw5o8S69l8sEA5Q Q+/3k2DdbAKGEl1vu9hAbBGBVkaJE708IEXMAj+YJM4tOwFWJCzgIzHz8TYmEJtFQFVi6/8e sAZeAVuJQ60nweISAvISqzccYAbZzAkUn9mrDjJHQuAcu8S+jlXsEDUuEuvP9DJD2MISr45v gYrLSPzfOZ8JoqGZUeLhubXsEE4Po8TlphmMEFXWEnfO/WID2cAsoCmxfpc+RNhRYs3uFcwQ L/NJ3HgrCBJmBjInbZsOFeaV6GgTgqhWk5h1fB3c2oMXLkGd4yHROW87KySADjNKfN9yiHkC o/wshGULGBlXMYqnlhbnpqcWG+WllusVJ+YWl+al6yXn525iBCao0/+Of9nBuOtP0iFGAQ5G JR7eiM/r44RYE8uKK3MPMUpwMCuJ8O5oAQrxpiRWVqUW5ccXleakFh9ilOZgURLnNV70MlZI ID2xJDU7NbUgtQgmy8TBKdXAqPxMeH9caFgt04/DWtmWj/x0q89+28o8YYqCp8lV+9ADG/ey HGZQv38jqWBe9yyDINbMG0zbeidKq9dzNs6rVbFQ1FgyPe+VmIHgMv+qZ6dyQmvz703783jt lZY7AdMcJiuc5mtNTj7+bNkWETFzr3ut1ztiHLdOW/n/4UGBaqV1woHdN/bPUGIpzkg01GIu Kk4EAL6Bl7lMAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprDIsWRmVeSWpSXmKPExsVy+t/xe7o1AhviDLat5rfoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+HLlIZPFpsfXWC0u75rDZrH2yF12iw+r37NaHPzwhNXi +5bJTA68HmvmrWH0uLN0J6PH3m8LWDy2f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+EPV1g8 dt9sYPPo27KK0ePzJrkAnig9m6L80pJUhYz84hJbpWhDCyM9Q0sLPSMTSz1DY/NYKyNTJX07 m5TUnMyy1CJ9uwS9jPOzXrIVrOeseLyph72B8Qt7FyMHh4SAicT5o95djFwcQgJLGSW+dfWw dTFyAsVlJE5Oa2CFsIUl/lzrYoMo+sQocez/OrAiNgFDia63EAkRgU5GiWndH9lBHGaBf0wS J/ZuZwKpEhbwkZj5eBuYzSKgKrH1P8QKXgFbiUOtJ5kgVshLrN5wgBnkJE6g+MxedZCwkEC+ xN2n/1gmMPItYGRYxSiSWlqcm55bbKhXnJhbXJqXrpecn7uJERgz24793LyD8dLG4EOMAhyM Sjy8EZ/XxwmxJpYVV+YeYpTgYFYS4d3RAhTiTUmsrEotyo8vKs1JLT7EaAp000RmKdHkfGA8 55XEG5oamltYGpobmxubWSiJ83YIHIwREkhPLEnNTk0tSC2C6WPi4JRqYDRl2smZdaTtsAHT T4sU8eo3p25X3D342e7br9fmfP+e7LjlGn36SPmHNtmeQ8VLFCaKr9U9sK8i+Cr72feKndd+ N+zxMNy5z83t4wFLKTvH45pJd79N+fNWkVNEa1eZgI+P3MYGC4s0j4fnfq7WmJG/xLwkLq7m cL9IXfVq/U9ujQ4T11X2eyixFGckGmoxFxUnAgAhUwpyrwIAAA== X-CMS-MailID: 20200504125420eucas1p2387a795af11e62779e8aa7f7673a8562 X-Msg-Generator: CA X-RootMTR: 20200504125420eucas1p2387a795af11e62779e8aa7f7673a8562 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200504125420eucas1p2387a795af11e62779e8aa7f7673a8562 References: <20200504125017.5494-1-m.szyprowski@samsung.com> <20200504125359.5678-1-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 , Oleksandr Andrushchenko , xen-devel@lists.xenproject.org, 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 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 --- For more information, see '[PATCH v2 00/21] DRM: fix struct sg_table nents vs. orig_nents misuse' thread: https://lkml.org/lkml/2020/5/4/373 --- 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; }