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watchdog: da9055_wdt: Drop reference counting

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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 16:01:44 -08:00 committed by Wim Van Sebroeck
parent 756d1e9247
commit 43f676ace2
1 changed files with 0 additions and 24 deletions
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24
drivers/watchdog/da9055_wdt.c
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@ -35,7 +35,6 @@ MODULE_PARM_DESC(nowayout,
struct da9055_wdt_data {
struct watchdog_device wdt;
struct da9055 *da9055;
struct kref kref;
};
static const struct {
@ -99,24 +98,6 @@ static int da9055_wdt_ping(struct watchdog_device *wdt_dev)
DA9055_WATCHDOG_MASK, 1);
}
static void da9055_wdt_release_resources(struct kref *r)
{
}
static void da9055_wdt_ref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_get(&driver_data->kref);
}
static void da9055_wdt_unref(struct watchdog_device *wdt_dev)
{
struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
}
static int da9055_wdt_start(struct watchdog_device *wdt_dev)
{
return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
@ -138,8 +119,6 @@ static const struct watchdog_ops da9055_wdt_ops = {
.stop = da9055_wdt_stop,
.ping = da9055_wdt_ping,
.set_timeout = da9055_wdt_set_timeout,
.ref = da9055_wdt_ref,
.unref = da9055_wdt_unref,
};
static int da9055_wdt_probe(struct platform_device *pdev)
@ -165,8 +144,6 @@ static int da9055_wdt_probe(struct platform_device *pdev)
watchdog_set_nowayout(da9055_wdt, nowayout);
watchdog_set_drvdata(da9055_wdt, driver_data);
kref_init(&driver_data->kref);
ret = da9055_wdt_stop(da9055_wdt);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to stop watchdog, %d\n", ret);
@ -189,7 +166,6 @@ static int da9055_wdt_remove(struct platform_device *pdev)
struct da9055_wdt_data *driver_data = platform_get_drvdata(pdev);
watchdog_unregister_device(&driver_data->wdt);
kref_put(&driver_data->kref, da9055_wdt_release_resources);
return 0;
}