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authorBartosz Golaszewski <bgolaszewski@baylibre.com>2016-09-16 18:02:42 +0200
committerWolfram Sang <wsa@the-dreams.de>2016-09-24 10:48:18 +0200
commit8dd1fe1594a712eb326e1607c694fbd1baf85f4b (patch)
tree2058f58e44b3ecd72aac347e308fbcffbbd77625 /drivers/i2c
parent72cf8c565cf4e25312fb9fa65d306ae736104ade (diff)
downloadlinux-8dd1fe1594a712eb326e1607c694fbd1baf85f4b.tar.bz2
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-core.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index cdbbd9bdb7b4..981de21ab814 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -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