watchdog: da9052_wdt: Drop reference counting

Reference counting is now implemented in the watchdog core and no longer
required in watchdog drivers.

Since it was implememented a no-op, and since the local memory is allocated
with devm_kzalloc(), the reference counting code in the driver really did
not really work anyway, and this patch effectively fixes a bug which could
cause a crash on unloading if the watchdog device was still open.

Signed-off-by: Guenter Roeck <[e-mail]>
Signed-off-by: Wim Van Sebroeck <[e-mail]>

drivers/watchdog/da9052_wdt.c

···
 struct da9052_wdt_data {
 	struct watchdog_device wdt;
 	struct da9052 *da9052;
-	struct kref kref;
 	unsigned long jpast;
 };
 
···
 	{ 7, 131 },
 };
 
-
-static void da9052_wdt_release_resources(struct kref *r)
-{
-}
 
 static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
 				  unsigned int timeout)
···
 	}
 
 	return 0;
-}
-
-static void da9052_wdt_ref(struct watchdog_device *wdt_dev)
-{
-	struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
-
-	kref_get(&driver_data->kref);
-}
-
-static void da9052_wdt_unref(struct watchdog_device *wdt_dev)
-{
-	struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
-
-	kref_put(&driver_data->kref, da9052_wdt_release_resources);
 }
 
 static int da9052_wdt_start(struct watchdog_device *wdt_dev)
···
 	.stop = da9052_wdt_stop,
 	.ping = da9052_wdt_ping,
 	.set_timeout = da9052_wdt_set_timeout,
-	.ref = da9052_wdt_ref,
-	.unref = da9052_wdt_unref,
 };
 
 
···
 	da9052_wdt->parent = &pdev->dev;
 	watchdog_set_drvdata(da9052_wdt, driver_data);
 
-	kref_init(&driver_data->kref);
-
 	ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG,
 				DA9052_CONTROLD_TWDSCALE, 0);
 	if (ret < 0) {
···
 	struct da9052_wdt_data *driver_data = platform_get_drvdata(pdev);
 
 	watchdog_unregister_device(&driver_data->wdt);
-	kref_put(&driver_data->kref, da9052_wdt_release_resources);
 
 	return 0;
 }