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

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Message-ID: <20191217112847.31351-1-peter.ujfalusi@ti.com>
Date:   Tue, 17 Dec 2019 13:28:47 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <ulf.hansson@...aro.org>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>
CC:     <vkoul@...nel.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] mmc: mxs: 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/mxs-mmc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 4031217d21c3..d82674aed447 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -623,11 +623,11 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 		goto out_clk_disable;
 	}
 
-	ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
-	if (!ssp->dmach) {
+	ssp->dmach = dma_request_chan(&pdev->dev, "rx-tx");
+	if (IS_ERR(ssp->dmach)) {
 		dev_err(mmc_dev(host->mmc),
 			"%s: failed to request dma\n", __func__);
-		ret = -ENODEV;
+		ret = PTR_ERR(ssp->dmach);
 		goto out_clk_disable;
 	}
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki