On Wed, Jan 21, 2015 at 09:46:47AM +0530, Sumit Semwal wrote:
> +static int calc_constraints(struct device *dev,
> + struct dma_buf_constraints *calc_cons)
> +{
> + struct dma_buf_constraints cons = *calc_cons;
> +
> + cons.dma_mask &= dma_get_mask(dev);
I don't think this makes much sense when you consider that the DMA
infrastructure supports buses with offsets. The DMA mask is th
upper limit of the _bus_ specific address, it is not a mask per-se.
What this means is that &= is not the right operation. Moreover,
simply comparing masks which could be from devices on unrelated
buses doesn't make sense either.
However, that said, I don't have an answer for what you want to
achieve here.
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according to speedtest.net.
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