Subject: [RFC] ARM: dma-mapping: Return 0 if no ->set_dma_mask()

From: [email-masked] (Marek Szyprowski)
Date: Tue, 29 Jan 2013 12:31:13 +0100

Hello,

On 1/28/2013 9:33 AM, Hiroshi Doyu wrote:
> struct dma_map_ops iommu_ops doesn't have ->set_dma_mask, which causes
> crash when dma_set_mask() is called from some driver.

I think that the issue is a bit different. It looks that iommu_ops lacks
the mandatory set_dma_mask callback. arm_dma_set_mask() can be used for it,
so please update your patch to add this missing callback.

> Signed-off-by: Hiroshi Doyu <[email-masked]>
> ---
>   arch/arm/include/asm/dma-mapping.h |    6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
> index a58e0f5..95328bf 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -32,7 +32,11 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
>   
>   static inline int dma_set_mask(struct device *dev, u64 mask)
>   {
> -	return get_dma_ops(dev)->set_dma_mask(dev, mask);
> +	struct dma_map_ops *ops = get_dma_ops(dev);
> +
> +	if (ops->set_dma_mask)
> +		return ops->set_dma_mask(dev, mask);
> +	return 0;
>   }
>   
>   #ifdef __arch_page_to_dma

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center