linux-kernel - [PATCH] ata: pxa: Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 17 Dec 2019 09:40:33 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <b.zolnierkie@...sung.com>, <axboe@...nel.dk>
CC:     <vkoul@...nel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ata: pxa: 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/ata/pata_pxa.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/pata_pxa.c b/drivers/ata/pata_pxa.c
index 41430f79663c..71678bed04b0 100644
--- a/drivers/ata/pata_pxa.c
+++ b/drivers/ata/pata_pxa.c
@@ -274,10 +274,9 @@ static int pxa_ata_probe(struct platform_device *pdev)
 	/*
 	 * Request the DMA channel
 	 */
-	data->dma_chan =
-		dma_request_slave_channel(&pdev->dev, "data");
-	if (!data->dma_chan)
-		return -EBUSY;
+	data->dma_chan = dma_request_chan(&pdev->dev, "data");
+	if (IS_ERR(data->dma_chan))
+		return PTR_ERR(data->dma_chan);
 	ret = dmaengine_slave_config(data->dma_chan, &config);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "dma configuration failed: %d\n", ret);
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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