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

[Julia Lawall <julia.lawall@lip6.fr>]

From: Julia Lawall <Julia.Lawall@lip6.fr>

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 kfree and iounmap, this also eliminates missing
resource-release problems.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
This is a patch against the version in
git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git

  sound/soc/mxs/mxs-saif.c |   47 ++++++++++++-----------------------------------
  1 file changed, 12 insertions(+), 35 deletions(-)

diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -632,7 +632,7 @@ static int mxs_saif_probe(struct platform_device *pdev)
  			return ret;
  	}

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

@@ -652,7 +652,7 @@ 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);
@@ -663,18 +663,11 @@ static int mxs_saif_probe(struct platform_device *pdev)
  		goto failed_get_resource;
  	}

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

  	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -682,7 +675,7 @@ 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;

@@ -691,14 +684,15 @@ 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);
@@ -706,7 +700,7 @@ 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);
@@ -714,7 +708,7 @@ 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(
@@ -737,36 +731,19 @@ 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;
  }