watchdog: nuc900_wdt: use devm_*() functions

Use devm_*() functions to make cleanup paths simpler.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 11 insertions, 39 deletions

diff --git a/drivers/watchdog/nuc900_wdt.c b/drivers/watchdog/nuc900_wdt.c
index 04c45a102992..e2b6d2cf5c9d 100644
--- a/drivers/watchdog/nuc900_wdt.c
+++ b/drivers/watchdog/nuc900_wdt.c
@@ -61,7 +61,6 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
         "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 
 struct nuc900_wdt {
-        struct resource  *res;
         struct clk       *wdt_clock;
         struct platform_device *pdev;
         void __iomem     *wdt_base;
@@ -244,9 +243,11 @@ static struct miscdevice nuc900wdt_miscdev = {
 
 static int nuc900wdt_probe(struct platform_device *pdev)
 {
+        struct resource *res;
         int ret = 0;
 
-        nuc900_wdt = kzalloc(sizeof(struct nuc900_wdt), GFP_KERNEL);
+        nuc900_wdt = devm_kzalloc(&pdev->dev, sizeof(*nuc900_wdt),
+                                GFP_KERNEL);
         if (!nuc900_wdt)
                 return -ENOMEM;
 
@@ -254,33 +255,20 @@ static int nuc900wdt_probe(struct platform_device *pdev)
 
         spin_lock_init(&nuc900_wdt->wdt_lock);
 
-        nuc900_wdt->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (nuc900_wdt->res == NULL) {
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
                 dev_err(&pdev->dev, "no memory resource specified\n");
-                ret = -ENOENT;
-                goto err_get;
+                return -ENOENT;
         }
 
-        if (!request_mem_region(nuc900_wdt->res->start,
-                                resource_size(nuc900_wdt->res), pdev->name)) {
-                dev_err(&pdev->dev, "failed to get memory region\n");
-                ret = -ENOENT;
-                goto err_get;
-        }
-
-        nuc900_wdt->wdt_base = ioremap(nuc900_wdt->res->start,
-                                        resource_size(nuc900_wdt->res));
-        if (nuc900_wdt->wdt_base == NULL) {
-                dev_err(&pdev->dev, "failed to ioremap() region\n");
-                ret = -EINVAL;
-                goto err_req;
-        }
+        nuc900_wdt->wdt_base = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(nuc900_wdt->wdt_base))
+                return PTR_ERR(nuc900_wdt->wdt_base);
 
-        nuc900_wdt->wdt_clock = clk_get(&pdev->dev, NULL);
+        nuc900_wdt->wdt_clock = devm_clk_get(&pdev->dev, NULL);
         if (IS_ERR(nuc900_wdt->wdt_clock)) {
                 dev_err(&pdev->dev, "failed to find watchdog clock source\n");
-                ret = PTR_ERR(nuc900_wdt->wdt_clock);
-                goto err_map;
+                return PTR_ERR(nuc900_wdt->wdt_clock);
         }
 
         clk_enable(nuc900_wdt->wdt_clock);
@@ -298,14 +286,6 @@ static int nuc900wdt_probe(struct platform_device *pdev)
 
 err_clk:
         clk_disable(nuc900_wdt->wdt_clock);
-        clk_put(nuc900_wdt->wdt_clock);
-err_map:
-        iounmap(nuc900_wdt->wdt_base);
-err_req:
-        release_mem_region(nuc900_wdt->res->start,
-                                        resource_size(nuc900_wdt->res));
-err_get:
-        kfree(nuc900_wdt);
         return ret;
 }
 
@@ -314,14 +294,6 @@ static int nuc900wdt_remove(struct platform_device *pdev)
         misc_deregister(&nuc900wdt_miscdev);
 
         clk_disable(nuc900_wdt->wdt_clock);
-        clk_put(nuc900_wdt->wdt_clock);
-
-        iounmap(nuc900_wdt->wdt_base);
-
-        release_mem_region(nuc900_wdt->res->start,
-                                        resource_size(nuc900_wdt->res));
-
-        kfree(nuc900_wdt);
 
         return 0;
 }