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

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Date:   Tue, 17 Dec 2019 13:26:56 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <ulf.hansson@...aro.org>, <jh80.chung@...sung.com>
CC:     <vkoul@...nel.org>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] 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@...com>
---
 drivers/mmc/host/dw_mmc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index fc9d4d000f97..bc5278ab5707 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -833,12 +833,14 @@ static int dw_mci_edmac_init(struct dw_mci *host)
 	if (!host->dms)
 		return -ENOMEM;
 
-	host->dms->ch = dma_request_slave_channel(host->dev, "rx-tx");
-	if (!host->dms->ch) {
+	host->dms->ch = dma_request_chan(host->dev, "rx-tx");
+	if (IS_ERR(host->dms->ch)) {
+		int ret = PTR_ERR(host->dms->ch);
+
 		dev_err(host->dev, "Failed to get external DMA channel.\n");
 		kfree(host->dms);
 		host->dms = NULL;
-		return -ENXIO;
+		return ret;
 	}
 
 	return 0;
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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