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Subject[PATCH 1/2] i2c: add i2c_trylock_bus wrapper, use it
Date
This unifies usage with i2c_lock_bus and i2c_unlock_bus, and paves the
way for the next patch which looks a bit saner with this preparatory
work taken care of beforehand.

Signed-off-by: Peter Rosin <peda@axentia.se>
---
drivers/i2c/i2c-core.c | 2 +-
drivers/i2c/i2c-mux.c | 4 ++--
include/linux/i2c.h | 14 ++++++++++++++
3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index af11b658984d..2c9135ffdf10 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -2311,7 +2311,7 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
#endif

if (in_atomic() || irqs_disabled()) {
- ret = adap->trylock_bus(adap, I2C_LOCK_SEGMENT);
+ ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT);
if (!ret)
/* I2C activity is ongoing. */
return -EAGAIN;
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 8eee98634cda..764f195795e4 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -159,7 +159,7 @@ static int i2c_mux_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
return 0; /* mux_lock not locked, failure */
if (!(flags & I2C_LOCK_ROOT_ADAPTER))
return 1; /* we only want mux_lock, success */
- if (parent->trylock_bus(parent, flags))
+ if (i2c_trylock_bus(parent, flags))
return 1; /* parent locked too, success */
rt_mutex_unlock(&parent->mux_lock);
return 0; /* parent not locked, failure */
@@ -193,7 +193,7 @@ static int i2c_parent_trylock_bus(struct i2c_adapter *adapter,

if (!rt_mutex_trylock(&parent->mux_lock))
return 0; /* mux_lock not locked, failure */
- if (parent->trylock_bus(parent, flags))
+ if (i2c_trylock_bus(parent, flags))
return 1; /* parent locked too, success */
rt_mutex_unlock(&parent->mux_lock);
return 0; /* parent not locked, failure */
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 96a25ae14494..e1a8d72ebccb 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -588,6 +588,20 @@ i2c_lock_bus(struct i2c_adapter *adapter, unsigned int flags)
}

/**
+ * i2c_trylock_bus - Try to get exclusive access to an I2C bus segment
+ * @adapter: Target I2C bus segment
+ * @flags: I2C_LOCK_ROOT_ADAPTER tries to locks the root i2c adapter,
+ * I2C_LOCK_SEGMENT tries to lock only this branch in the adapter tree
+ *
+ * Return: true if the I2C bus segment is locked, false otherwise
+ */
+static inline int
+i2c_trylock_bus(struct i2c_adapter *adapter, unsigned int flags)
+{
+ return adapter->trylock_bus(adapter, flags);
+}
+
+/**
* i2c_unlock_bus - Release exclusive access to an I2C bus segment
* @adapter: Target I2C bus segment
* @flags: I2C_LOCK_ROOT_ADAPTER unlocks the root i2c adapter, I2C_LOCK_SEGMENT
--
2.1.4
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