On Tuesday 05 May 2015 10:12:06 Suravee Suthikulpanit wrote:
> +struct dma_map_ops dummy_dma_ops = {
> + .alloc = __dummy_alloc,
> + .free = __dummy_free,
> + .mmap = __dummy_mmap,
> + .map_page = __dummy_map_page,
> + .unmap_page = __dummy_unmap_page,
> + .map_sg = __dummy_map_sg,
> + .unmap_sg = __dummy_unmap_sg,
> + .sync_single_for_cpu = __dummy_sync_single_for_cpu,
> + .sync_single_for_device = __dummy_sync_single_for_device,
> + .sync_sg_for_cpu = __dummy_sync_sg_for_cpu,
> + .sync_sg_for_device = __dummy_sync_sg_for_device,
> + .mapping_error = __dummy_mapping_error,
> + .dma_supported = __dummy_dma_supported,
> +};
> +EXPORT_SYMBOL(dummy_dma_ops);
> +
>
This will clearly work, but I think it's easier to just leave
the dma_mask pointer as NULL when creating the platform device,
which should let the normal dma ops fail all the callbacks.
Arnd
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