> +void arch_iommu_detach_device(struct device *dev)
> +{
> +#ifdef CONFIG_ARM_DMA_USE_IOMMU
> + struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
> + const struct dma_map_ops *dma_ops;
> +
> + if (!mapping)
> + return;
> +
> + arm_iommu_release_mapping(mapping);
> + arm_iommu_detach_device(dev);
> +
> + dma_ops = arm_get_dma_map_ops(dev->archdata.dma_coherent);
> + set_dma_ops(dev, dma_ops);
Why not simply:
set_dma_ops(dev, arm_get_dma_map_ops(dev->archdata.dma_coherent));
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