[PATCH v5 08/10] spi: expose master transfer size limitation.

[Martin Sperl]

> On 02.12.2015, at 00:12, Mark Brown <broonie at kernel.org> wrote:
> 
> On Tue, Dec 01, 2015 at 04:51:06PM -0000, Michal Suchanek wrote:
> 
>> +static inline size_t
>> +spi_max_transfer_size(struct spi_device *spi)
>> +{
>> +	struct spi_master *master = spi->master;
>> +	if (!master->max_transfer_size)
>> +		return 0;
>> +	return master->max_transfer_size(spi);
>> +}
> 
> Can we change this to return SIZE_MAX instead (ie, the maximum value for
> a size_t)?  That way callers don't need to worry if there is a limit, if
> they want to handle it they can just unconditionally assume that a limit
> will be provided.

As I just came across: spi_master.max_dma_len, so I wonder how this 
value would differ from the proposed spi_master.max_transfer_size
on specific HW?

For all practical purposes I would assume both are identical.

Martin