linux-kernel - [PATCH 7/9] probe/dma/sun4i: removed redundant code from sun4i dma controller's probe function

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Message-Id: <20190915073201.24032-1-sst2005@gmail.com>
Date:   Sun, 15 Sep 2019 13:02:00 +0530
From:   Satendra Singh Thakur <sst2005@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     satendrasingh.thakur@....com,
        Satendra Singh Thakur <sst2005@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/9] probe/dma/sun4i: removed redundant code from sun4i dma controller's probe function

1. In order to remove duplicate code, following functions:
platform_get_resource
devm_kzalloc
devm_ioremap_resource
devm_clk_get
platform_get_irq
are replaced with a macro devm_platform_probe_helper.

2. This patch depends on the file include/linux/probe-helper.h
which is pushed in previous patch [01/09].

Signed-off-by: Satendra Singh Thakur <satendrasingh.thakur@....com>
Signed-off-by: Satendra Singh Thakur <sst2005@...il.com>
---
 drivers/dma/sun4i-dma.c | 30 +++++++++---------------------
 1 file changed, 9 insertions(+), 21 deletions(-)

diff --git a/drivers/dma/sun4i-dma.c b/drivers/dma/sun4i-dma.c
index 1f80568b2613..5db139ff43ac 100644
--- a/drivers/dma/sun4i-dma.c
+++ b/drivers/dma/sun4i-dma.c
@@ -15,6 +15,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/probe-helper.h>
 
 #include "virt-dma.h"
 
@@ -1119,29 +1120,16 @@ static irqreturn_t sun4i_dma_interrupt(int irq, void *dev_id)
 static int sun4i_dma_probe(struct platform_device *pdev)
 {
 	struct sun4i_dma_dev *priv;
-	struct resource *res;
 	int i, j, ret;
 
-	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(priv->base))
-		return PTR_ERR(priv->base);
-
-	priv->irq = platform_get_irq(pdev, 0);
-	if (priv->irq < 0) {
-		dev_err(&pdev->dev, "Cannot claim IRQ\n");
-		return priv->irq;
-	}
-
-	priv->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(priv->clk)) {
-		dev_err(&pdev->dev, "No clock specified\n");
-		return PTR_ERR(priv->clk);
-	}
+	/*
+	 * This macro internally combines following functions:
+	 * devm_kzalloc, platform_get_resource, devm_ioremap_resource,
+	 * devm_clk_get, platform_get_irq
+	 */
+	ret = devm_platform_probe_helper(pdev, priv, NULL);
+	if (ret < 0)
+		return ret;
 
 	platform_set_drvdata(pdev, priv);
 	spin_lock_init(&priv->lock);
-- 
2.17.1