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i2c: export i2c_adapter_depth()
For crazy setups in which an i2c gpio expander is behind an i2c gpio multiplexer controlled by a gpio provided a second expander using the same device driver we need to explicitly tell lockdep how to handle nested locking. Export i2c_adapter_depth() as public API to be reused outside of i2c core code. Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Acked-by: Peter Rosin <peda@axentia.se> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -1426,13 +1426,7 @@ static void i2c_adapter_dev_release(struct device *dev)
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complete(&adap->dev_released);
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}
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/*
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* This function is only needed for mutex_lock_nested, so it is never
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* called unless locking correctness checking is enabled. Thus we
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* make it inline to avoid a compiler warning. That's what gcc ends up
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* doing anyway.
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*/
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static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
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unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
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{
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unsigned int depth = 0;
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@ -1441,6 +1435,7 @@ static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
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return depth;
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}
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EXPORT_SYMBOL_GPL(i2c_adapter_depth);
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/*
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* Let users instantiate I2C devices through sysfs. This can be used when
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@ -698,6 +698,7 @@ extern void i2c_clients_command(struct i2c_adapter *adap,
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extern struct i2c_adapter *i2c_get_adapter(int nr);
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extern void i2c_put_adapter(struct i2c_adapter *adap);
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extern unsigned int i2c_adapter_depth(struct i2c_adapter *adapter);
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void i2c_parse_fw_timings(struct device *dev, struct i2c_timings *t, bool use_defaults);
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