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Message-ID: <alpine.DEB.2.02.1201241828480.1779@localhost6.localdomain6>
Date: Tue, 24 Jan 2012 18:29:13 +0100 (CET)
From: Julia Lawall <julia.lawall@...6.fr>
To: Dong Aisheng-B29396 <B29396@...escale.com>
cc: Julia Lawall <Julia.Lawall@...6.fr>, Liam Girdwood <lrg@...com>,
"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [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 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@...6.fr>
---
sound/soc/mxs/mxs-saif.c | 44 ++++++++++++++------------------------------
1 file changed, 14 insertions(+), 30 deletions(-)
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index f204dba..6a72ad9 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;
@@ -652,10 +652,9 @@ static int mxs_saif_probe(struct platform_device *pdev)
saif->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(saif->clk)) {
- ret = PTR_ERR(saif->clk);
dev_err(&pdev->dev, "Cannot get the clock: %d\n",
ret);
- goto failed_clk;
+ return PTR_ERR(saif->clk);
}
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -666,18 +665,19 @@ 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 +685,7 @@ 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 +694,15 @@ 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 +710,7 @@ 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 +718,7 @@ 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 +741,19 @@ 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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