[PATCH 4/5] spi: rockchip: Use dev_err_probe() in the probe path

[Dragan Simic]

Use function dev_err_probe() in the probe path instead of dev_err() where
appropriate, to make the code a bit more uniform and compact, and to improve
error handling for the TX and RX DMA channel requests.

Previously, deferred requests for the TX and RX DMA channels produced no
debug messages, and the final error messages didn't include the error codes,
which are all highly useful when debugging permanently failed DMA channel
requests, such as when the required drivers aren't enabled.

Suggested-by: Hélene Vulquin <oss at helene.moe>
Signed-off-by: Dragan Simic <dsimic at manjaro.org>
---
 drivers/spi/spi-rockchip.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index 28879fed03f8..6b5c67a357bb 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -773,15 +773,15 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 
 	rs->apb_pclk = devm_clk_get_enabled(&pdev->dev, "apb_pclk");
 	if (IS_ERR(rs->apb_pclk)) {
-		dev_err(&pdev->dev, "Failed to get apb_pclk\n");
-		ret = PTR_ERR(rs->apb_pclk);
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(rs->apb_pclk),
+				    "Failed to get apb_pclk\n");
 		goto err_put_ctlr;
 	}
 
 	rs->spiclk = devm_clk_get_enabled(&pdev->dev, "spiclk");
 	if (IS_ERR(rs->spiclk)) {
-		dev_err(&pdev->dev, "Failed to get spi_pclk\n");
-		ret = PTR_ERR(rs->spiclk);
+		ret = dev_err_probe(&pdev->dev, PTR_ERR(rs->spiclk),
+				    "Failed to get spi_pclk\n");
 		goto err_put_ctlr;
 	}
 
@@ -853,22 +853,21 @@ static int rockchip_spi_probe(struct platform_device *pdev)
 
 	ctlr->dma_tx = dma_request_chan(rs->dev, "tx");
 	if (IS_ERR(ctlr->dma_tx)) {
-		/* Check tx to see if we need defer probing driver */
-		if (PTR_ERR(ctlr->dma_tx) == -EPROBE_DEFER) {
-			ret = -EPROBE_DEFER;
+		/* Check tx to see if we need to defer driver probing */
+		ret = dev_err_probe(rs->dev, PTR_ERR(ctlr->dma_tx),
+				    "Failed to request TX DMA channel\n");
+		if (ret == -EPROBE_DEFER)
 			goto err_disable_pm_runtime;
-		}
-		dev_warn(rs->dev, "Failed to request TX DMA channel\n");
 		ctlr->dma_tx = NULL;
 	}
 
 	ctlr->dma_rx = dma_request_chan(rs->dev, "rx");
 	if (IS_ERR(ctlr->dma_rx)) {
-		if (PTR_ERR(ctlr->dma_rx) == -EPROBE_DEFER) {
-			ret = -EPROBE_DEFER;
+		/* Check rx to see if we need to defer driver probing */
+		ret = dev_err_probe(rs->dev, PTR_ERR(ctlr->dma_rx),
+				    "Failed to request RX DMA channel\n");
+		if (ret == -EPROBE_DEFER)
 			goto err_free_dma_tx;
-		}
-		dev_warn(rs->dev, "Failed to request RX DMA channel\n");
 		ctlr->dma_rx = NULL;
 	}