[WATCHDOG] at32ap700x-wdt: add iounmap if probe function fails

Signed-off-by: Hans-Christian Egtvedt <hcegtvedt@atmel.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/char/watchdog/at32ap700x_wdt.c b/drivers/char/watchdog/at32ap700x_wdt.c
index a3e288701baf..745d38f25190 100644
--- a/drivers/char/watchdog/at32ap700x_wdt.c
+++ b/drivers/char/watchdog/at32ap700x_wdt.c
@@ -223,6 +223,11 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
         }
 
         wdt->regs = ioremap(regs->start, regs->end - regs->start + 1);
+        if (!wdt->regs) {
+                ret = -ENOMEM;
+                dev_dbg(&pdev->dev, "could not map I/O memory\n");
+                goto err_free;
+        }
         wdt->users = 0;
         wdt->miscdev.minor = WATCHDOG_MINOR;
         wdt->miscdev.name = "watchdog";
@@ -238,7 +243,7 @@ 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_register;
+                goto err_iounmap;
         }
 
         platform_set_drvdata(pdev, wdt);
@@ -247,7 +252,9 @@ static int __init at32_wdt_probe(struct platform_device *pdev)
 
         return 0;
 
-err_register:
+err_iounmap:
+        iounmap(wdt->regs);
+err_free:
         kfree(wdt);
         wdt = NULL;
         return ret;