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rtc-mxc: multiple fixes in rtc-mxc probe method 

On exit paths in mxc_rtc_probe() method some resources are not freed
correctly.

This patch fixes:
* unrequested memory region containing imx RTC registers
* iounmap() isn't called on exit_free_pdata branch
* clock get rate is called for freed clock source
* clock isn't disabled on exit_put_clk branch

To simplify the fix managed device resources are used.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Vladimir Zapolskiy <vzapolskiy@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vladimir Zapolskiy 2010-04-06 14:35:07 -07:00 committed by Linus Torvalds
parent 8725d54162
commit c783a29efc
1 changed files with 13 additions and 13 deletions
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26
drivers/rtc/rtc-mxc.c
View File

@ -384,21 +384,26 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
struct rtc_device *rtc;
struct rtc_plat_data *pdata = NULL;
u32 reg;
int ret, rate;
unsigned long rate;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->ioaddr = ioremap(res->start, resource_size(res));
if (!devm_request_mem_region(&pdev->dev, res->start,
resource_size(res), pdev->name))
return -EBUSY;
pdata->ioaddr = devm_ioremap(&pdev->dev, res->start,
resource_size(res));
clk = clk_get(&pdev->dev, "ckil");
if (IS_ERR(clk)) {
iounmap(pdata->ioaddr);
ret = PTR_ERR(clk);
goto exit_free_pdata;
}
@ -413,8 +418,7 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
else if (rate == 38400)
reg = RTC_INPUT_CLK_38400HZ;
else {
dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n",
clk_get_rate(clk));
dev_err(&pdev->dev, "rtc clock is not valid (%lu)\n", rate);
ret = -EINVAL;
goto exit_free_pdata;
}
@ -450,8 +454,8 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
pdata->irq = platform_get_irq(pdev, 0);
if (pdata->irq >= 0 &&
request_irq(pdata->irq, mxc_rtc_interrupt, IRQF_SHARED,
pdev->name, pdev) < 0) {
devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt,
IRQF_SHARED, pdev->name, pdev) < 0) {
dev_warn(&pdev->dev, "interrupt not available.\n");
pdata->irq = -1;
}
@ -459,10 +463,10 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
return 0;
exit_put_clk:
clk_disable(pdata->clk);
clk_put(pdata->clk);
exit_free_pdata:
kfree(pdata);
return ret;
}
@ -473,12 +477,8 @@ static int __exit mxc_rtc_remove(struct platform_device *pdev)
rtc_device_unregister(pdata->rtc);
if (pdata->irq >= 0)
free_irq(pdata->irq, pdev);
clk_disable(pdata->clk);
clk_put(pdata->clk);
kfree(pdata);
platform_set_drvdata(pdev, NULL);
return 0;