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>
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index c77f6f7..d71fe61 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -384,21 +384,26 @@
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 @@
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 @@
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 @@
return 0;
exit_put_clk:
+ clk_disable(pdata->clk);
clk_put(pdata->clk);
exit_free_pdata:
- kfree(pdata);
return ret;
}
@@ -473,12 +477,8 @@
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;