drivers/rtc/rtc-tegra.c: clean up probe/remove routines

Use the devres managed resource functions in the probe routine.  Also
affects the remove routine where the previously used free and release
functions are not needed.

The devm_* functions eliminate the need for manual resource releasing and
simplify error handling.  Resources allocated by devm_* are freed
automatically on driver detach.

Signed-off-by: Hannu Heikkinen <ext-hannu.m.heikkinen@nokia.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 37 deletions

diff --git a/drivers/rtc/rtc-tegra.c b/drivers/rtc/rtc-tegra.c
index 75259fe38602..c006025cecc8 100644
--- a/drivers/rtc/rtc-tegra.c
+++ b/drivers/rtc/rtc-tegra.c
@@ -309,7 +309,8 @@ static int __devinit tegra_rtc_probe(struct platform_device *pdev)
         struct resource *res;
         int ret;
 
-        info = kzalloc(sizeof(struct tegra_rtc_info), GFP_KERNEL);
+        info = devm_kzalloc(&pdev->dev, sizeof(struct tegra_rtc_info),
+                GFP_KERNEL);
         if (!info)
                 return -ENOMEM;
 
@@ -317,29 +318,18 @@ static int __devinit tegra_rtc_probe(struct platform_device *pdev)
         if (!res) {
                 dev_err(&pdev->dev,
                         "Unable to allocate resources for device.\n");
-                ret = -EBUSY;
-                goto err_free_info;
+                return -EBUSY;
         }
 
-        if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
-                dev_err(&pdev->dev,
-                        "Unable to request mem region for device.\n");
-                ret = -EBUSY;
-                goto err_free_info;
+        info->rtc_base = devm_request_and_ioremap(&pdev->dev, res);
+        if (!info->rtc_base) {
+                dev_err(&pdev->dev, "Unable to request mem region and grab IOs for device.\n");
+                return -EBUSY;
         }
 
         info->tegra_rtc_irq = platform_get_irq(pdev, 0);
-        if (info->tegra_rtc_irq <= 0) {
-                ret = -EBUSY;
-                goto err_release_mem_region;
-        }
-
-        info->rtc_base = ioremap_nocache(res->start, resource_size(res));
-        if (!info->rtc_base) {
-                dev_err(&pdev->dev, "Unable to grab IOs for device.\n");
-                ret = -EBUSY;
-                goto err_release_mem_region;
-        }
+        if (info->tegra_rtc_irq <= 0)
+                return -EBUSY;
 
         /* set context info. */
         info->pdev = pdev;
@@ -362,11 +352,12 @@ static int __devinit tegra_rtc_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev,
                         "Unable to register device (err=%d).\n",
                         ret);
-                goto err_iounmap;
+                return ret;
         }
 
-        ret = request_irq(info->tegra_rtc_irq, tegra_rtc_irq_handler,
-                IRQF_TRIGGER_HIGH, "rtc alarm", &pdev->dev);
+        ret = devm_request_irq(&pdev->dev, info->tegra_rtc_irq,
+                        tegra_rtc_irq_handler, IRQF_TRIGGER_HIGH,
+                        "rtc alarm", &pdev->dev);
         if (ret) {
                 dev_err(&pdev->dev,
                         "Unable to request interrupt for device (err=%d).\n",
@@ -380,12 +371,6 @@ static int __devinit tegra_rtc_probe(struct platform_device *pdev)
 
 err_dev_unreg:
         rtc_device_unregister(info->rtc_dev);
-err_iounmap:
-        iounmap(info->rtc_base);
-err_release_mem_region:
-        release_mem_region(res->start, resource_size(res));
-err_free_info:
-        kfree(info);
 
         return ret;
 }
@@ -393,17 +378,8 @@ err_free_info:
 static int __devexit tegra_rtc_remove(struct platform_device *pdev)
 {
         struct tegra_rtc_info *info = platform_get_drvdata(pdev);
-        struct resource *res;
-
-        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-        if (!res)
-                return -EBUSY;
 
-        free_irq(info->tegra_rtc_irq, &pdev->dev);
         rtc_device_unregister(info->rtc_dev);
-        iounmap(info->rtc_base);
-        release_mem_region(res->start, resource_size(res));
-        kfree(info);
 
         platform_set_drvdata(pdev, NULL);