[PATCH v3 4/4] mmc: atmel-mci: use probe deferring if dma controller is not ready yet

[Ludovic Desroches]

On Fri, Nov 28, 2014 at 02:19:03PM +0000, Russell King - ARM Linux wrote:
> Let's look at the resulting code:
> 
> On Fri, Nov 28, 2014 at 03:08:06PM +0100, Ludovic Desroches wrote:
> > +static int atmci_configure_dma(struct atmel_mci *host)
> >  {
> > +	int ret = 0;
> >  
> > +	host->dma.chan = dma_request_slave_channel_reason(&host->pdev->dev, "rxtx");
> > +	if (IS_ERR(host->dma.chan))
> > +		return PTR_ERR(host->dma.chan);
> > +
> > +	dev_info(&host->pdev->dev, "using %s for DMA transfers\n",
> > +		 dma_chan_name(host->dma.chan));
> > +
> > +	host->dma_conf.src_addr = host->mapbase + ATMCI_RDR;
> > +	host->dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> > +	host->dma_conf.src_maxburst = 1;
> > +	host->dma_conf.dst_addr = host->mapbase + ATMCI_TDR;
> > +	host->dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> > +	host->dma_conf.dst_maxburst = 1;
> > +	host->dma_conf.device_fc = false;
> > +
> > +	return ret;
> >  }
> 
> I think you can clean this up a little further - what do you notice
> about the value of "ret" here?

I think I see what you mean :) The fix I have merged for this patch
makes ret useless.

> 
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