RTC/watchdog: M41T80: fix a potential use of unitialized data

Watchdog handlers within the driver make use of "save_client" -- make sure it
has been initalized before the handlers are registered.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexander Bigga <ab@mycable.de>
Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 316bfaa..3d451ec 100644 (file)
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -803,6 +803,7 @@ static int m41t80_probe(struct i2c_client *client,
 
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
        if (clientdata->features & M41T80_FEATURE_HT) {
+               save_client = client;
                rc = misc_register(&wdt_dev);
                if (rc)
                        goto exit;
@@ -811,7 +812,6 @@ static int m41t80_probe(struct i2c_client *client,
                        misc_deregister(&wdt_dev);
                        goto exit;
                }
-               save_client = client;
        }
 #endif
        return 0;