linux-kernel - [PATCH] crypto: stm32/hash - Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 17 Dec 2019 09:35:06 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <vkoul@...nel.org>, <linux-crypto@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH] crypto: stm32/hash - 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/crypto/stm32/stm32-hash.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/stm32/stm32-hash.c b/drivers/crypto/stm32/stm32-hash.c
index cfc8e0e37bee..167b80eec437 100644
--- a/drivers/crypto/stm32/stm32-hash.c
+++ b/drivers/crypto/stm32/stm32-hash.c
@@ -518,10 +518,10 @@ static int stm32_hash_dma_init(struct stm32_hash_dev *hdev)
 	dma_conf.dst_maxburst = hdev->dma_maxburst;
 	dma_conf.device_fc = false;
 
-	hdev->dma_lch = dma_request_slave_channel(hdev->dev, "in");
-	if (!hdev->dma_lch) {
+	hdev->dma_lch = dma_request_chan(hdev->dev, "in");
+	if (IS_ERR(hdev->dma_lch)) {
 		dev_err(hdev->dev, "Couldn't acquire a slave DMA channel.\n");
-		return -EBUSY;
+		return PTR_ERR(hdev->dma_lch);
 	}
 
 	err = dmaengine_slave_config(hdev->dma_lch, &dma_conf);
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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