>  static inline bool dma_addressing_limited(struct device *dev)
>  {
> -     return min_not_zero(*dev->dma_mask, dev->bus_dma_mask) <
> -             dma_get_required_mask(dev);
> +     return WARN_ON_ONCE(!dev->dma_mask) ? false :
> +             min_not_zero(*dev->dma_mask, dev->bus_dma_mask) <
> +                     dma_get_required_mask(dev);

This should really use a separate if statement, but I can fix that
up when applying it.
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