watchdog: at32ap700x_wdt: register misc device last in probe() function

This patch reworks the probe() function in the at32ap700x_wdt driver, this to
make sure the miscdev is properly initialized and the driver is ready to be
accessed.

Reported-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>
Signed-off-by: Wim Van sebroeck <wim@iguana.be>

1 files changed, 10 insertions, 6 deletions

diff --git a/drivers/watchdog/at32ap700x_wdt.c b/drivers/watchdog/at32ap700x_wdt.c
index 1cddf92cb9a6..750bc5281d79 100644
--- a/drivers/watchdog/at32ap700x_wdt.c
+++ b/drivers/watchdog/at32ap700x_wdt.c
@@ -346,9 +346,13 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
         } else {
                 wdt->users = 0;
         }
-        wdt->miscdev.minor = WATCHDOG_MINOR;
-        wdt->miscdev.name = "watchdog";
-        wdt->miscdev.fops = &at32_wdt_fops;
+
+        wdt->miscdev.minor      = WATCHDOG_MINOR;
+        wdt->miscdev.name       = "watchdog";
+        wdt->miscdev.fops       = &at32_wdt_fops;
+        wdt->miscdev.parent     = &pdev->dev;
+
+        platform_set_drvdata(pdev, wdt);
 
         if (at32_wdt_settimeout(timeout)) {
                 at32_wdt_settimeout(TIMEOUT_DEFAULT);
@@ -360,17 +364,17 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
         ret = misc_register(&wdt->miscdev);
         if (ret) {
                 dev_dbg(&pdev->dev, "failed to register wdt miscdev\n");
-                goto err_iounmap;
+                goto err_register;
         }
 
-        platform_set_drvdata(pdev, wdt);
-        wdt->miscdev.parent = &pdev->dev;
         dev_info(&pdev->dev,
                 "AT32AP700X WDT at 0x%p, timeout %d sec (nowayout=%d)\n",
                 wdt->regs, wdt->timeout, nowayout);
 
         return 0;
 
+err_register:
+        platform_set_drvdata(pdev, NULL);
 err_iounmap:
         iounmap(wdt->regs);
 err_free: