Re: [PATCH] mmc: s3cmci: Use DMA slave map rather than exported DMA filter

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On 10/26/2016 11:21 AM, Arnd Bergmann wrote:
> On Wednesday, October 26, 2016 11:08:27 AM CEST Sylwester Nawrocki wrote:
>> > @@ -1685,13 +1684,7 @@ static int s3cmci_probe(struct platform_device *pdev)
>> >         /* depending on the dma state, get a dma channel to use. */
>> >  
>> >         if (s3cmci_host_usedma(host)) {
>> > -               dma_cap_mask_t mask;
>> > -
>> > -               dma_cap_zero(mask);
>> > -               dma_cap_set(DMA_SLAVE, mask);
>> > -
>> > -               host->dma = dma_request_slave_channel_compat(mask,
>> > -                       s3c24xx_dma_filter, (void *)DMACH_SDI, &pdev->dev, "rx-tx");
>> > +               host->dma = dma_request_slave_channel(&pdev->dev, "rx-tx");
>> >                 if (!host->dma) {
>> >                         dev_err(&pdev->dev, "cannot get DMA channel.\n");
>> >                         ret = -EBUSY;
>
> Can you convert it to use dma_request_chan()+PTR_ERR_OR_ZERO() instead?

Thanks for your review. dma_request_chan() seems to be returning 
either valid pointer or ERR_PTR(), so it would be sufficient 
to use just PTR_ERR(host->dma) on error path?


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