Messages in this thread | | | Date | Wed, 16 Jan 2019 07:30:02 +0100 | From | Gerd Hoffmann <> | Subject | Re: [PATCH v2] drm/xen-front: Make shmem backed display buffer coherent |
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Hi,
> + if (!dma_map_sg(dev->dev, xen_obj->sgt->sgl, xen_obj->sgt->nents, > + DMA_BIDIRECTIONAL)) { > + ret = -EFAULT; > + goto fail_free_sgt; > + }
Hmm, so it seems the arm guys could not come up with a suggestion how to solve that one in a better way. Ok, lets go with this then.
But didn't we agree that this deserves a comment exmplaining the purpose of the dma_map_sg() call is to flush caches and that there is no actual DMA happening here?
cheers, Gerd
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