Re: [PATCH 1/2] dma-mapping: Protect dma_addressing_limited against NULL dma_mask

[Christoph Hellwig]

>  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.