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

drivers/i2c/i2c-core.c

+12 −3
Original line number Diff line number Diff line
@@ -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;

}
@@ -2423,7 +2429,10 @@ EXPORT_SYMBOL(i2c_get_adapter); 


void i2c_put_adapter(struct i2c_adapter *adap)

{

	if (adap)

	if (!adap)

		return;



	put_device(&adap->dev);

	module_put(adap->owner);

}

EXPORT_SYMBOL(i2c_put_adapter);