[PATCH] watchdog: cleanup s3c2410_wdt probe and release
From: Ben Dooks
Date: Mon Dec 18 2006 - 05:32:05 EST
Cleanup the s3c2410_wdt driver's exit point by
using labels instead of multiple returns. Also
remove the checks for the resources having been
allocate in the exit, as we will now either have
fully allocated or not allocated the resources
at-all.
Signed-off-by: Ben Dooks <ben-linux@xxxxxxxxx>
diff -urpN -X ../dontdiff linux-2.6.20-rc1/drivers/char/watchdog/s3c2410_wdt.c linux-2.6.20-rc1-fix2/drivers/char/watchdog/s3c2410_wdt.c
--- linux-2.6.20-rc1/drivers/char/watchdog/s3c2410_wdt.c 2006-11-29 21:57:37.000000000 +0000
+++ linux-2.6.20-rc1-fix2/drivers/char/watchdog/s3c2410_wdt.c 2006-12-18 10:26:55.000000000 +0000
@@ -366,13 +366,15 @@ static int s3c2410wdt_probe(struct platf
wdt_mem = request_mem_region(res->start, size, pdev->name);
if (wdt_mem == NULL) {
printk(KERN_INFO PFX "failed to get memory region\n");
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_req;
}
wdt_base = ioremap(res->start, size);
if (wdt_base == 0) {
printk(KERN_INFO PFX "failed to ioremap() region\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_req;
}
DBG("probe: mapped wdt_base=%p\n", wdt_base);
@@ -380,22 +382,21 @@ static int s3c2410wdt_probe(struct platf
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res == NULL) {
printk(KERN_INFO PFX "failed to get irq resource\n");
- iounmap(wdt_base);
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_map;
}
ret = request_irq(res->start, s3c2410wdt_irq, 0, pdev->name, pdev);
if (ret != 0) {
printk(KERN_INFO PFX "failed to install irq (%d)\n", ret);
- iounmap(wdt_base);
- return ret;
+ goto err_map;
}
wdt_clock = clk_get(&pdev->dev, "watchdog");
if (wdt_clock == NULL) {
printk(KERN_INFO PFX "failed to find watchdog clock source\n");
- iounmap(wdt_base);
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_irq;
}
clk_enable(wdt_clock);
@@ -418,8 +419,7 @@ static int s3c2410wdt_probe(struct platf
if (ret) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (%d)\n",
WATCHDOG_MINOR, ret);
- iounmap(wdt_base);
- return ret;
+ goto err_clk;
}
if (tmr_atboot && started == 0) {
@@ -434,26 +434,36 @@ static int s3c2410wdt_probe(struct platf
}
return 0;
+
+ err_clk:
+ clk_disable(wdt_clock);
+ clk_put(wdt_clock);
+
+ err_irq:
+ free_irq(wdt_irq->start, pdev);
+
+ err_map:
+ iounmap(wdt_base);
+
+ err_req:
+ release_resource(wdt_mem);
+ kfree(wdt_mem);
+
+ return ret;
}
static int s3c2410wdt_remove(struct platform_device *dev)
{
- if (wdt_mem != NULL) {
- release_resource(wdt_mem);
- kfree(wdt_mem);
- wdt_mem = NULL;
- }
-
- if (wdt_irq != NULL) {
- free_irq(wdt_irq->start, dev);
- wdt_irq = NULL;
- }
-
- if (wdt_clock != NULL) {
- clk_disable(wdt_clock);
- clk_put(wdt_clock);
- wdt_clock = NULL;
- }
+ release_resource(wdt_mem);
+ kfree(wdt_mem);
+ wdt_mem = NULL;
+
+ free_irq(wdt_irq->start, dev);
+ wdt_irq = NULL;
+
+ clk_disable(wdt_clock);
+ clk_put(wdt_clock);
+ wdt_clock = NULL;
iounmap(wdt_base);
misc_deregister(&s3c2410wdt_miscdev);
diff -urpN -X ../dontdiff linux-2.6.20-rc1/drivers/char/watchdog/s3c2410_wdt.c linux-2.6.20-rc1-fix2/drivers/char/watchdog/s3c2410_wdt.c
--- linux-2.6.20-rc1/drivers/char/watchdog/s3c2410_wdt.c 2006-11-29 21:57:37.000000000 +0000
+++ linux-2.6.20-rc1-fix2/drivers/char/watchdog/s3c2410_wdt.c 2006-12-18 10:26:55.000000000 +0000
@@ -366,13 +366,15 @@ static int s3c2410wdt_probe(struct platf
wdt_mem = request_mem_region(res->start, size, pdev->name);
if (wdt_mem == NULL) {
printk(KERN_INFO PFX "failed to get memory region\n");
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_req;
}
wdt_base = ioremap(res->start, size);
if (wdt_base == 0) {
printk(KERN_INFO PFX "failed to ioremap() region\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto err_req;
}
DBG("probe: mapped wdt_base=%p\n", wdt_base);
@@ -380,22 +382,21 @@ static int s3c2410wdt_probe(struct platf
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res == NULL) {
printk(KERN_INFO PFX "failed to get irq resource\n");
- iounmap(wdt_base);
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_map;
}
ret = request_irq(res->start, s3c2410wdt_irq, 0, pdev->name, pdev);
if (ret != 0) {
printk(KERN_INFO PFX "failed to install irq (%d)\n", ret);
- iounmap(wdt_base);
- return ret;
+ goto err_map;
}
wdt_clock = clk_get(&pdev->dev, "watchdog");
if (wdt_clock == NULL) {
printk(KERN_INFO PFX "failed to find watchdog clock source\n");
- iounmap(wdt_base);
- return -ENOENT;
+ ret = -ENOENT;
+ goto err_irq;
}
clk_enable(wdt_clock);
@@ -418,8 +419,7 @@ static int s3c2410wdt_probe(struct platf
if (ret) {
printk (KERN_ERR PFX "cannot register miscdev on minor=%d (%d)\n",
WATCHDOG_MINOR, ret);
- iounmap(wdt_base);
- return ret;
+ goto err_clk;
}
if (tmr_atboot && started == 0) {
@@ -434,26 +434,36 @@ static int s3c2410wdt_probe(struct platf
}
return 0;
+
+ err_clk:
+ clk_disable(wdt_clock);
+ clk_put(wdt_clock);
+
+ err_irq:
+ free_irq(wdt_irq->start, pdev);
+
+ err_map:
+ iounmap(wdt_base);
+
+ err_req:
+ release_resource(wdt_mem);
+ kfree(wdt_mem);
+
+ return ret;
}
static int s3c2410wdt_remove(struct platform_device *dev)
{
- if (wdt_mem != NULL) {
- release_resource(wdt_mem);
- kfree(wdt_mem);
- wdt_mem = NULL;
- }
-
- if (wdt_irq != NULL) {
- free_irq(wdt_irq->start, dev);
- wdt_irq = NULL;
- }
-
- if (wdt_clock != NULL) {
- clk_disable(wdt_clock);
- clk_put(wdt_clock);
- wdt_clock = NULL;
- }
+ release_resource(wdt_mem);
+ kfree(wdt_mem);
+ wdt_mem = NULL;
+
+ free_irq(wdt_irq->start, dev);
+ wdt_irq = NULL;
+
+ clk_disable(wdt_clock);
+ clk_put(wdt_clock);
+ wdt_clock = NULL;
iounmap(wdt_base);
misc_deregister(&s3c2410wdt_miscdev);