For the problem when using swiotlb

Catalin Marinas
2014-11-21T10:32:14Z

On Fri, Nov 21, 2014 at 09:35:10AM +0000, Catalin Marinas wrote:
> @@ -88,11 +89,24 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
> {
> if (!dev->dma_mask || !dma_supported(dev, mask))
> return -EIO;
> + /* if asking for bigger dma mask, limit it to the bus dma ranges */
> + if (mask > *dev->dma_mask)
> + mask &= of_dma_get_range_mask(dev);
> *dev->dma_mask = mask;
>
> return 0;
> }

I wonder whether mask &= of_dma_get_range_mask(dev) limiting should
actually be done before actually checking dma_supported(). That's
because a device may try to set a 64-bit mask but being connected to a
more limiting bus, we should check the dma_supported() on the resulting
mask.

--
Catalin