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Message-Id: <c0afb787f4d36e0f4cfb055ce8c566acbe39beca.1378964390.git.michal.simek@xilinx.com>
Date: Thu, 12 Sep 2013 07:39:59 +0200
From: Michal Simek <michal.simek@...inx.com>
To: linux-kernel@...r.kernel.org
Cc: Michal Simek <monstr@...str.eu>,
Michal Simek <michal.simek@...inx.com>,
Pavel Machek <pavel@....cz>, "Hans J. Koch" <hjk@...sjkoch.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] uio: Simplify uio error path by using devres functions
Using devres functions simplify driver error path.
- Use devm_kzalloc
- Use devm_request_irq
Signed-off-by: Michal Simek <michal.simek@...inx.com>
---
---
drivers/uio/uio.c | 16 ++++------------
drivers/uio/uio_pdrv_genirq.c | 34 ++++++++++------------------------
2 files changed, 14 insertions(+), 36 deletions(-)
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index ba47563..11d4e0a 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -796,10 +796,9 @@ int __uio_register_device(struct module *owner,
info->uio_dev = NULL;
- idev = kzalloc(sizeof(*idev), GFP_KERNEL);
+ idev = devm_kzalloc(parent, sizeof(*idev), GFP_KERNEL);
if (!idev) {
- ret = -ENOMEM;
- goto err_kzalloc;
+ return -ENOMEM;
}
idev->owner = owner;
@@ -809,7 +808,7 @@ int __uio_register_device(struct module *owner,
ret = uio_get_minor(idev);
if (ret)
- goto err_get_minor;
+ return ret;
idev->dev = device_create(&uio_class, parent,
MKDEV(uio_major, idev->minor), idev,
@@ -827,7 +826,7 @@ int __uio_register_device(struct module *owner,
info->uio_dev = idev;
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
- ret = request_irq(info->irq, uio_interrupt,
+ ret = devm_request_irq(parent, info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
if (ret)
goto err_request_irq;
@@ -841,9 +840,6 @@ err_uio_dev_add_attributes:
device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
err_device_create:
uio_free_minor(idev);
-err_get_minor:
- kfree(idev);
-err_kzalloc:
return ret;
}
EXPORT_SYMBOL_GPL(__uio_register_device);
@@ -864,13 +860,9 @@ void uio_unregister_device(struct uio_info *info)
uio_free_minor(idev);
- if (info->irq && (info->irq != UIO_IRQ_CUSTOM))
- free_irq(info->irq, idev);
-
uio_dev_del_attributes(idev);
device_destroy(&uio_class, MKDEV(uio_major, idev->minor));
- kfree(idev);
return;
}
diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
index 90ff17a..7666931 100644
--- a/drivers/uio/uio_pdrv_genirq.c
+++ b/drivers/uio/uio_pdrv_genirq.c
@@ -112,11 +112,11 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
if (pdev->dev.of_node) {
/* alloc uioinfo for one device */
- uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
+ uioinfo = devm_kzalloc(&pdev->dev, sizeof(*uioinfo),
+ GFP_KERNEL);
if (!uioinfo) {
- ret = -ENOMEM;
dev_err(&pdev->dev, "unable to kmalloc\n");
- return ret;
+ return -ENOMEM;
}
uioinfo->name = pdev->dev.of_node->name;
uioinfo->version = "devicetree";
@@ -125,20 +125,19 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
if (!uioinfo || !uioinfo->name || !uioinfo->version) {
dev_err(&pdev->dev, "missing platform_data\n");
- goto bad0;
+ return ret;
}
if (uioinfo->handler || uioinfo->irqcontrol ||
uioinfo->irq_flags & IRQF_SHARED) {
dev_err(&pdev->dev, "interrupt configuration error\n");
- goto bad0;
+ return ret;
}
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
- ret = -ENOMEM;
dev_err(&pdev->dev, "unable to kmalloc\n");
- goto bad0;
+ return -ENOMEM;
}
priv->uioinfo = uioinfo;
@@ -153,7 +152,7 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
uioinfo->irq = UIO_IRQ_NONE;
else if (ret < 0) {
dev_err(&pdev->dev, "failed to get IRQ\n");
- goto bad1;
+ return ret;
}
}
@@ -209,20 +208,12 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
ret = uio_register_device(&pdev->dev, priv->uioinfo);
if (ret) {
dev_err(&pdev->dev, "unable to register uio device\n");
- goto bad2;
+ pm_runtime_disable(&pdev->dev);
+ return ret;
}
platform_set_drvdata(pdev, priv);
return 0;
- bad2:
- pm_runtime_disable(&pdev->dev);
- bad1:
- kfree(priv);
- bad0:
- /* kfree uioinfo for OF */
- if (pdev->dev.of_node)
- kfree(uioinfo);
- return ret;
}
static int uio_pdrv_genirq_remove(struct platform_device *pdev)
@@ -235,11 +226,6 @@ static int uio_pdrv_genirq_remove(struct platform_device *pdev)
priv->uioinfo->handler = NULL;
priv->uioinfo->irqcontrol = NULL;
- /* kfree uioinfo for OF */
- if (pdev->dev.of_node)
- kfree(priv->uioinfo);
-
- kfree(priv);
return 0;
}
--
1.8.2.3
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