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authorMyungJoo Ham <myungjoo.ham@samsung.com>2012-01-13 14:14:23 +0900
committerWim Van Sebroeck <wim@iguana.be>2012-02-28 17:08:42 +0100
commit78d3e00bb0bcfb11596b14f5d5472922b4c7e429 (patch)
tree77383ee603f6cbe195475cfc43279faade8b431e /drivers/watchdog
parent97d2a10d5804d585ab0b58efbd710948401b886a (diff)
downloadop-kernel-dev-78d3e00bb0bcfb11596b14f5d5472922b4c7e429.zip
op-kernel-dev-78d3e00bb0bcfb11596b14f5d5472922b4c7e429.tar.gz
watchdog: fix error in probe() of s3c2410_wdt (reset at booting)
Probe function of s3c2410 watchdog calls request_irq before initializing required value (wdt_count). This incurs resetting watchdog counter value and watchdog-reboot during booting up. This patch addresses such an issue by calling request_irq later. Error handling in probe function and calling oder in remove function are also revised accordingly. Reported-by: Chanwoo Park <cw00.choi@samsung.com> Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/s3c2410_wdt.c57
1 files changed, 31 insertions, 26 deletions
diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 4bc3744..404172f 100644
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -312,18 +312,26 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev)
dev = &pdev->dev;
wdt_dev = &pdev->dev;
- /* get the memory region for the watchdog timer */
-
wdt_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (wdt_mem == NULL) {
dev_err(dev, "no memory resource specified\n");
return -ENOENT;
}
+ wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (wdt_irq == NULL) {
+ dev_err(dev, "no irq resource specified\n");
+ ret = -ENOENT;
+ goto err;
+ }
+
+ /* get the memory region for the watchdog timer */
+
size = resource_size(wdt_mem);
if (!request_mem_region(wdt_mem->start, size, pdev->name)) {
dev_err(dev, "failed to get memory region\n");
- return -EBUSY;
+ ret = -EBUSY;
+ goto err;
}
wdt_base = ioremap(wdt_mem->start, size);
@@ -335,29 +343,17 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev)
DBG("probe: mapped wdt_base=%p\n", wdt_base);
- wdt_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (wdt_irq == NULL) {
- dev_err(dev, "no irq resource specified\n");
- ret = -ENOENT;
- goto err_map;
- }
-
- ret = request_irq(wdt_irq->start, s3c2410wdt_irq, 0, pdev->name, pdev);
- if (ret != 0) {
- dev_err(dev, "failed to install irq (%d)\n", ret);
- goto err_map;
- }
-
wdt_clock = clk_get(&pdev->dev, "watchdog");
if (IS_ERR(wdt_clock)) {
dev_err(dev, "failed to find watchdog clock source\n");
ret = PTR_ERR(wdt_clock);
- goto err_irq;
+ goto err_map;
}
clk_enable(wdt_clock);
- if (s3c2410wdt_cpufreq_register() < 0) {
+ ret = s3c2410wdt_cpufreq_register();
+ if (ret < 0) {
printk(KERN_ERR PFX "failed to register cpufreq\n");
goto err_clk;
}
@@ -378,12 +374,18 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev)
"cannot start\n");
}
+ ret = request_irq(wdt_irq->start, s3c2410wdt_irq, 0, pdev->name, pdev);
+ if (ret != 0) {
+ dev_err(dev, "failed to install irq (%d)\n", ret);
+ goto err_cpufreq;
+ }
+
watchdog_set_nowayout(&s3c2410_wdd, nowayout);
ret = watchdog_register_device(&s3c2410_wdd);
if (ret) {
dev_err(dev, "cannot register watchdog (%d)\n", ret);
- goto err_cpufreq;
+ goto err_irq;
}
if (tmr_atboot && started == 0) {
@@ -408,23 +410,26 @@ static int __devinit s3c2410wdt_probe(struct platform_device *pdev)
return 0;
+ err_irq:
+ free_irq(wdt_irq->start, pdev);
+
err_cpufreq:
s3c2410wdt_cpufreq_deregister();
err_clk:
clk_disable(wdt_clock);
clk_put(wdt_clock);
-
- err_irq:
- free_irq(wdt_irq->start, pdev);
+ wdt_clock = NULL;
err_map:
iounmap(wdt_base);
err_req:
release_mem_region(wdt_mem->start, size);
- wdt_mem = NULL;
+ err:
+ wdt_irq = NULL;
+ wdt_mem = NULL;
return ret;
}
@@ -432,18 +437,18 @@ static int __devexit s3c2410wdt_remove(struct platform_device *dev)
{
watchdog_unregister_device(&s3c2410_wdd);
+ free_irq(wdt_irq->start, dev);
+
s3c2410wdt_cpufreq_deregister();
clk_disable(wdt_clock);
clk_put(wdt_clock);
wdt_clock = NULL;
- free_irq(wdt_irq->start, dev);
- wdt_irq = NULL;
-
iounmap(wdt_base);
release_mem_region(wdt_mem->start, resource_size(wdt_mem));
+ wdt_irq = NULL;
wdt_mem = NULL;
return 0;
}
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