linux-kernel - [PATCH] mmc: owl-mmc: Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 17 Dec 2019 13:29:34 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <ulf.hansson@...aro.org>, <afaerber@...e.de>
CC:     <vkoul@...nel.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] mmc: owl-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@...com>
---
 drivers/mmc/host/owl-mmc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/owl-mmc.c b/drivers/mmc/host/owl-mmc.c
index 771e3d00f1bb..01ffe51f413d 100644
--- a/drivers/mmc/host/owl-mmc.c
+++ b/drivers/mmc/host/owl-mmc.c
@@ -616,10 +616,10 @@ static int owl_mmc_probe(struct platform_device *pdev)
 
 	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
-	owl_host->dma = dma_request_slave_channel(&pdev->dev, "mmc");
-	if (!owl_host->dma) {
+	owl_host->dma = dma_request_chan(&pdev->dev, "mmc");
+	if (IS_ERR(owl_host->dma)) {
 		dev_err(owl_host->dev, "Failed to get external DMA channel.\n");
-		ret = -ENXIO;
+		ret = PTR_ERR(owl_host->dma);
 		goto err_free_host;
 	}
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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