Re: [PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

[Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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On Tue, Jun 09, 2015 at 06:05:21PM +0800, Eddie Huang wrote:

> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -539,8 +539,8 @@ static int __spi_map_msg(struct spi_master *master,
> struct spi_message *msg)
>         if (!master->can_dma)
>                 return 0;

> -       tx_dev = master->dma_tx->device->dev;
> -       rx_dev = master->dma_rx->device->dev;
> +       tx_dev = master->dma_tx ? master->dma_tx->device->dev :
> master->dev;
> +       rx_dev = master->dma_rx ? master->dma_rx->device->dev : master-

> Is this what you want ? Actually, I don't like first one at all.

Not quite what I'd been thinking of - we can't just pick the device in
the core safely, the device might be a MFD or have some other
restriction that needs us to use a separate struct device.  However most
of those cases are likely to point towards implementing a dmaengine
device so probably the above will work for most cases and is fine.  Can
you send a proper patch please?

Please don't use the ternery operator, though.

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