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i2c: export i2c_adapter_depth()

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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 <[email protected]>
Acked-by: Peter Rosin <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>
This commit is contained in:
Bartosz Golaszewski 2016-09-16 18:02:42 +02:00 • committed by Wolfram Sang
commit 8dd1fe1594
2 changed files with 3 additions and 7 deletions
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9
drivers/i2c/i2c-core.c
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@ -1426,13 +1426,7 @@ static void i2c_adapter_dev_release(struct device *dev)
complete(&adap->dev_released);
}
/*
* This function is only needed for mutex_lock_nested, so it is never
* called unless locking correctness checking is enabled. Thus we
* make it inline to avoid a compiler warning. That's what gcc ends up
* doing anyway.
*/
static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
{
unsigned int depth = 0;
@ -1441,6 +1435,7 @@ static inline unsigned int i2c_adapter_depth(struct i2c_adapter *adapter)
return depth;
}
EXPORT_SYMBOL_GPL(i2c_adapter_depth);
/*
* Let users instantiate I2C devices through sysfs. This can be used when