Commit 611e12ea authored by Vladimir Zapolskiy's avatar Vladimir Zapolskiy Committed by Wolfram Sang

i2c: core: manage i2c bus device refcount in i2c_[get|put]_adapter

In addition to module_get()/module_put() add get_device()/put_device()
calls into i2c_get_adapter()/i2c_put_adapter() exported
interfaces. This is done to lock I2C bus device, if it is in use by a
client.
Signed-off-by: default avatarVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 141124e6
......@@ -2413,9 +2413,15 @@ struct i2c_adapter *i2c_get_adapter(int nr)
mutex_lock(&core_lock);
adapter = idr_find(&i2c_adapter_idr, nr);
if (adapter && !try_module_get(adapter->owner))
if (!adapter)
goto exit;
if (try_module_get(adapter->owner))
get_device(&adapter->dev);
else
adapter = NULL;
exit:
mutex_unlock(&core_lock);
return adapter;
}
......@@ -2423,8 +2429,11 @@ EXPORT_SYMBOL(i2c_get_adapter);
void i2c_put_adapter(struct i2c_adapter *adap)
{
if (adap)
module_put(adap->owner);
if (!adap)
return;
put_device(&adap->dev);
module_put(adap->owner);
}
EXPORT_SYMBOL(i2c_put_adapter);
......
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