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mmc: dw_mmc: Use dma_request_chan() instead dma_request_slave_channel() 

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191217112656.30860-1-peter.ujfalusi@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Peter Ujfalusi 2019-12-17 13:26:56 +02:00 committed by Ulf Hansson
parent 9f606f11ea
commit c1fce22522
1 changed files with 5 additions and 3 deletions
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8
drivers/mmc/host/dw_mmc.c
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@ -833,12 +833,14 @@ static int dw_mci_edmac_init(struct dw_mci *host)
if (!host->dms) if (!host->dms)
return -ENOMEM; return -ENOMEM;
host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx"); host->dms->ch = dma_request_chan(host->dev, "rx-tx");
if (!host->dms->ch) { if (IS_ERR(host->dms->ch)) {
int ret = PTR_ERR(host->dms->ch);
dev_err(host->dev, "Failed to get external DMA channel.\n"); dev_err(host->dev, "Failed to get external DMA channel.\n");
kfree(host->dms); kfree(host->dms);
host->dms = NULL; host->dms = NULL;
return -ENXIO; return ret;
} }
return 0; return 0;