Re: [PATCH 1/15] sound/soc/mxs/mxs-saif.c: add missing iounmap

[Julia Lawall]

> From nobody Tue Jan 24 18:26:10 CET 2012
From: Julia Lawall <Julia.Lawall@xxxxxxx>
To: Liam Girdwood <lrg@xxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>,Jaroslav Kysela <perex@xxxxxxxx>,Takashi Iwai <tiwai@xxxxxxx>,alsa-devel@xxxxxxxxxxxxxxxx,linux-kernel@xxxxxxxxxxxxxxx
Subject: [PATCH] sound/soc/mxs/mxs-saif.c: use devm_ functions

From: Julia Lawall <Julia.Lawall@xxxxxxx>

The various devm_ functions allocate memory that is released when a driver
detaches.  This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.

By removing the need for iounmap, this also eliminates a missing iounmap
problem, in the the original error handling code following a successful
call to ioremap.

Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx>

---
 sound/soc/mxs/mxs-saif.c |   43 ++++++++++++++-----------------------------
 1 file changed, 14 insertions(+), 29 deletions(-)

diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index f204dba..7d755e0 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -630,7 +630,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
 	if (pdev->id >= ARRAY_SIZE(mxs_saif))
 		return -EINVAL;

-	saif = kzalloc(sizeof(*saif), GFP_KERNEL);
+	saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
 	if (!saif)
 		return -ENOMEM;

@@ -655,7 +655,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		ret = PTR_ERR(saif->clk);
 		dev_err(&pdev->dev, "Cannot get the clock: %d\n",
 			ret);
-		goto failed_clk;
+		return ret;
 	}

 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -666,18 +666,19 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		goto failed_get_resource;
 	}

-	if (!request_mem_region(iores->start, resource_size(iores),
-				"mxs-saif")) {
+	if (!devm_request_mem_region(&pdev->dev, iores->start,
+				     resource_size(iores), "mxs-saif")) {
 		dev_err(&pdev->dev, "request_mem_region failed\n");
 		ret = -EBUSY;
 		goto failed_get_resource;
 	}

-	saif->base = ioremap(iores->start, resource_size(iores));
+	saif->base = devm_ioremap(&pdev->dev, iores->start,
+				  resource_size(iores));
 	if (!saif->base) {
 		dev_err(&pdev->dev, "ioremap failed\n");
 		ret = -ENODEV;
-		goto failed_ioremap;
+		goto failed_get_resource;
 	}

 	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -685,7 +686,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		ret = -ENODEV;
 		dev_err(&pdev->dev, "failed to get dma resource: %d\n",
 			ret);
-		goto failed_ioremap;
+		goto failed_get_resource;
 	}
 	saif->dma_param.chan_num = dmares->start;

@@ -694,14 +695,15 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		ret = saif->irq;
 		dev_err(&pdev->dev, "failed to get irq resource: %d\n",
 			ret);
-		goto failed_get_irq1;
+		goto failed_get_resource;
 	}

 	saif->dev = &pdev->dev;
-	ret = request_irq(saif->irq, mxs_saif_irq, 0, "mxs-saif", saif);
+	ret = devm_request_irq(&pdev->dev, saif->irq, mxs_saif_irq, 0,
+			       "mxs-saif", saif);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to request irq\n");
-		goto failed_get_irq1;
+		goto failed_get_resource;
 	}

 	saif->dma_param.chan_irq = platform_get_irq(pdev, 1);
@@ -709,7 +711,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
 		ret = saif->dma_param.chan_irq;
 		dev_err(&pdev->dev, "failed to get dma irq resource: %d\n",
 			ret);
-		goto failed_get_irq2;
+		goto failed_get_resource;
 	}

 	platform_set_drvdata(pdev, saif);
@@ -717,7 +719,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
 	ret = snd_soc_register_dai(&pdev->dev, &mxs_saif_dai);
 	if (ret) {
 		dev_err(&pdev->dev, "register DAI failed\n");
-		goto failed_register;
+		goto failed_get_resource;
 	}

 	saif->soc_platform_pdev = platform_device_alloc(
@@ -740,36 +742,19 @@ failed_pdev_add:
 	platform_device_put(saif->soc_platform_pdev);
 failed_pdev_alloc:
 	snd_soc_unregister_dai(&pdev->dev);
-failed_register:
-failed_get_irq2:
-	free_irq(saif->irq, saif);
-failed_get_irq1:
-	iounmap(saif->base);
-failed_ioremap:
-	release_mem_region(iores->start, resource_size(iores));
 failed_get_resource:
 	clk_put(saif->clk);
-failed_clk:
-	kfree(saif);

 	return ret;
 }

 static int __devexit mxs_saif_remove(struct platform_device *pdev)
 {
-	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	struct mxs_saif *saif = platform_get_drvdata(pdev);

 	platform_device_unregister(saif->soc_platform_pdev);
-
 	snd_soc_unregister_dai(&pdev->dev);
-
-	iounmap(saif->base);
-	release_mem_region(res->start, resource_size(res));
-	free_irq(saif->irq, saif);
-
 	clk_put(saif->clk);
-	kfree(saif);

 	return 0;
 }
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