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Date: Sat, 28 Jan 2012 08:03:34 +0100 (CET) From: Julia Lawall <julia.lawall@...6.fr> To: Mark Brown <broonie@...nsource.wolfsonmicro.com> cc: Julia Lawall <julia.lawall@...6.fr>, Wolfram Sang <w.sang@...gutronix.de>, "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>, Takashi Iwai <tiwai@...e.de>, "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Dong Aisheng-B29396 <B29396@...escale.com>, Liam Girdwood <lrg@...com> Subject: Re: [alsa-devel] [PATCH 1/15] sound/soc/mxs/mxs-saif.c: add missing iounmap From: Julia Lawall <Julia.Lawall@...6.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. This also removes a now unneeded test on iores. Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr> --- patch against git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git sound/soc/mxs/mxs-saif.c | 53 ++++++++++------------------------------------- 1 file changed, 12 insertions(+), 41 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; @@ -652,29 +652,16 @@ 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); - if (!iores) { - ret = -ENODEV; - dev_err(&pdev->dev, "failed to get io resource: %d\n", - ret); - 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 +669,7 @@ 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 +678,15 @@ 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 +694,7 @@ 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 +702,7 @@ 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 +725,19 @@ 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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