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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 <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Guenter Roeck 2015-12-25 16:01:43 -08:00 committed by Wim Van Sebroeck
parent b4ffb19098
commit 756d1e9247
1 changed files with 0 additions and 24 deletions
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24
drivers/watchdog/da9052_wdt.c
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@ -31,7 +31,6 @@
struct da9052_wdt_data {
struct watchdog_device wdt;
struct da9052 *da9052;
struct kref kref;
unsigned long jpast;
};
@ -51,10 +50,6 @@ static const struct {
};
static void da9052_wdt_release_resources(struct kref *r)
{
}
static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
unsigned int timeout)
{
@ -104,20 +99,6 @@ static int da9052_wdt_set_timeout(struct watchdog_device *wdt_dev,
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)
{
return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
@ -170,8 +151,6 @@ static const struct watchdog_ops da9052_wdt_ops = {
.stop = da9052_wdt_stop,
.ping = da9052_wdt_ping,
.set_timeout = da9052_wdt_set_timeout,
.ref = da9052_wdt_ref,
.unref = da9052_wdt_unref,
};
@ -198,8 +177,6 @@ static int da9052_wdt_probe(struct platform_device *pdev)
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) {
@ -225,7 +202,6 @@ static int da9052_wdt_remove(struct platform_device *pdev)
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;
}