linux-kernel - [PATCH v2 6/8] spi: imx: return error from dma channel request

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Message-ID: <2d4cc8c07de8e90b76763d2c40aea57c598ee1a1.1442923630.git.anton_bondarenko@mentor.com>
Date:	Fri, 25 Sep 2015 19:57:13 +0200
From:	Anton Bondarenko <anton_bondarenko@...tor.com>
To:	<broonie@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-spi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <jiada_wang@...tor.com>,
	<muzaffar_mahmood@...ay1.mentorg.com>,
	<vladimir_zapolskiy@...tor.com>, <b38343@...escale.com>
Subject: [PATCH v2 6/8] spi: imx: return error from dma channel request

On SDMA initialization return exactly the same error, which is
reported by dma_request_slave_channel_reason(), it is a preceding
change to defer SPI DMA initialization, if SDMA module is not yet
available.

Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>
Signed-off-by: Anton Bondarenko <anton_bondarenko@...tor.com>
---
 drivers/spi/spi-imx.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index 4b3c16e..44d3cf0 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -929,18 +929,20 @@ static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
 	spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
 
 	/* Prepare for TX DMA: */
-	master->dma_tx = dma_request_slave_channel(dev, "tx");
-	if (!master->dma_tx) {
-		dev_err(dev, "cannot get the TX DMA channel!\n");
-		ret = -EINVAL;
+	master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
+	if (IS_ERR(master->dma_tx)) {
+		dev_info(dev, "cannot get the TX DMA channel!\n");
+		ret = PTR_ERR(master->dma_tx);
+		master->dma_tx = NULL;
 		goto err;
 	}
 
 	/* Prepare for RX : */
-	master->dma_rx = dma_request_slave_channel(dev, "rx");
-	if (!master->dma_rx) {
-		dev_dbg(dev, "cannot get the DMA channel.\n");
-		ret = -EINVAL;
+	master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
+	if (IS_ERR(master->dma_rx)) {
+		dev_info(dev, "cannot get the DMA channel.\n");
+		ret = PTR_ERR(master->dma_rx);
+		master->dma_rx = NULL;
 		goto err;
 	}
 
-- 
2.5.2

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