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Message-ID: <20140807121328.GA2961@himangi-Dell>
Date: Thu, 7 Aug 2014 17:43:28 +0530
From: Himangi Saraogi <himangi774@...il.com>
To: Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org
Cc: Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH] pcie-gadget-spear: use devm_ functions
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. Also, the unnecessary labels are removed and
linux/device.h is added to make sure the devm_*() routine declarations
are unambiguously available.
The initial call to platform_get_resource is moved down to the
introduced call to devm_ioremap_resource that uses its result.
Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
Not compile tested due to incompatible architecture.
To send to: Arnd Bergmann <arnd@...db.de>,Greg Kroah-Hartman <gregkh@...uxfoundation.org>,linux-kernel@...r.kernel.org
This changes the order of memory deallocation operations with respect to
configfs_unregister_subsystem in the remove function. Will that be fine?
drivers/misc/spear13xx_pcie_gadget.c | 98 +++++++++---------------------------
1 file changed, 23 insertions(+), 75 deletions(-)
diff --git a/drivers/misc/spear13xx_pcie_gadget.c b/drivers/misc/spear13xx_pcie_gadget.c
index 2e13614..fe3ad0c 100644
--- a/drivers/misc/spear13xx_pcie_gadget.c
+++ b/drivers/misc/spear13xx_pcie_gadget.c
@@ -9,6 +9,7 @@
* warranty of any kind, whether express or implied.
*/
+#include <linux/device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/delay.h>
@@ -743,58 +744,33 @@ static int spear_pcie_gadget_probe(struct platform_device *pdev)
struct config_item *cg_item;
struct configfs_subsystem *subsys;
- /* get resource for application registers*/
-
- res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res0) {
- dev_err(&pdev->dev, "no resource defined\n");
- return -EBUSY;
- }
- if (!request_mem_region(res0->start, resource_size(res0),
- pdev->name)) {
- dev_err(&pdev->dev, "pcie gadget region already claimed\n");
- return -EBUSY;
- }
- /* get resource for dbi registers*/
-
- res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- if (!res1) {
- dev_err(&pdev->dev, "no resource defined\n");
- goto err_rel_res0;
- }
- if (!request_mem_region(res1->start, resource_size(res1),
- pdev->name)) {
- dev_err(&pdev->dev, "pcie gadget region already claimed\n");
- goto err_rel_res0;
- }
-
- target = kzalloc(sizeof(*target), GFP_KERNEL);
+ target = devm_kzalloc(&pdev->dev, sizeof(*target), GFP_KERNEL);
if (!target) {
dev_err(&pdev->dev, "out of memory\n");
- status = -ENOMEM;
- goto err_rel_res;
+ return -ENOMEM;
}
cg_item = &target->subsys.su_group.cg_item;
sprintf(cg_item->ci_namebuf, "pcie_gadget.%d", pdev->id);
cg_item->ci_type = &pcie_gadget_target_type;
config = &target->config;
- config->va_app_base = (void __iomem *)ioremap(res0->start,
- resource_size(res0));
- if (!config->va_app_base) {
+
+ /* get resource for application registers*/
+ res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ config->va_app_base = devm_ioremap_resource(&pdev->dev, res0);
+ if (IS_ERR(config->va_app_base)) {
dev_err(&pdev->dev, "ioremap fail\n");
- status = -ENOMEM;
- goto err_kzalloc;
+ return PTR_ERR(config->va_app_base);
}
+ /* get resource for dbi registers*/
+ res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
config->base = (void __iomem *)res1->start;
- config->va_dbi_base = (void __iomem *)ioremap(res1->start,
- resource_size(res1));
- if (!config->va_dbi_base) {
+ config->va_dbi_base = devm_ioremap_resource(&pdev->dev, res1);
+ if (IS_ERR(config->va_dbi_base)) {
dev_err(&pdev->dev, "ioremap fail\n");
- status = -ENOMEM;
- goto err_iounmap_app;
+ return PTR_ERR(config->va_dbi_base);
}
platform_set_drvdata(pdev, target);
@@ -802,15 +778,15 @@ static int spear_pcie_gadget_probe(struct platform_device *pdev)
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no update irq?\n");
- status = irq;
- goto err_iounmap;
+ return irq;
}
- status = request_irq(irq, spear_pcie_gadget_irq, 0, pdev->name, NULL);
+ status = devm_request_irq(&pdev->dev, irq, spear_pcie_gadget_irq,
+ 0, pdev->name, NULL);
if (status) {
dev_err(&pdev->dev,
"pcie gadget interrupt IRQ%d already claimed\n", irq);
- goto err_iounmap;
+ return status;
}
/* Register configfs hooks */
@@ -819,7 +795,7 @@ static int spear_pcie_gadget_probe(struct platform_device *pdev)
mutex_init(&subsys->su_mutex);
status = configfs_register_subsystem(subsys);
if (status)
- goto err_irq;
+ return status;
/*
* init basic pcie application registers
@@ -835,13 +811,12 @@ static int spear_pcie_gadget_probe(struct platform_device *pdev)
clk = clk_get_sys("pcie1", NULL);
if (IS_ERR(clk)) {
pr_err("%s:couldn't get clk for pcie1\n", __func__);
- status = PTR_ERR(clk);
- goto err_irq;
+ return PTR_ERR(clk);
}
status = clk_enable(clk);
if (status) {
pr_err("%s:couldn't enable clk for pcie1\n", __func__);
- goto err_irq;
+ return status;
}
} else if (pdev->id == 2) {
/*
@@ -851,53 +826,26 @@ static int spear_pcie_gadget_probe(struct platform_device *pdev)
clk = clk_get_sys("pcie2", NULL);
if (IS_ERR(clk)) {
pr_err("%s:couldn't get clk for pcie2\n", __func__);
- status = PTR_ERR(clk);
- goto err_irq;
+ return PTR_ERR(clk);
}
status = clk_enable(clk);
if (status) {
pr_err("%s:couldn't enable clk for pcie2\n", __func__);
- goto err_irq;
+ return status;
}
}
spear13xx_pcie_device_init(config);
return 0;
-err_irq:
- free_irq(irq, NULL);
-err_iounmap:
- iounmap(config->va_dbi_base);
-err_iounmap_app:
- iounmap(config->va_app_base);
-err_kzalloc:
- kfree(target);
-err_rel_res:
- release_mem_region(res1->start, resource_size(res1));
-err_rel_res0:
- release_mem_region(res0->start, resource_size(res0));
- return status;
}
static int spear_pcie_gadget_remove(struct platform_device *pdev)
{
- struct resource *res0, *res1;
static struct pcie_gadget_target *target;
- struct spear_pcie_gadget_config *config;
- int irq;
- res0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- res1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
- irq = platform_get_irq(pdev, 0);
target = platform_get_drvdata(pdev);
- config = &target->config;
- free_irq(irq, NULL);
- iounmap(config->va_dbi_base);
- iounmap(config->va_app_base);
- release_mem_region(res1->start, resource_size(res1));
- release_mem_region(res0->start, resource_size(res0));
configfs_unregister_subsystem(&target->subsys);
- kfree(target);
return 0;
}
--
1.9.1
--
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