diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 30 | ||||
| -rw-r--r-- | drivers/i2c/i2c-dev.c | 13 |
2 files changed, 24 insertions, 19 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index bea4c5021d26..40e563de0508 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -425,14 +425,14 @@ static int __i2c_check_addr_busy(struct device *dev, void *addrp) /* walk up mux tree */ static int i2c_check_mux_parents(struct i2c_adapter *adapter, int addr) { + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); int result; result = device_for_each_child(&adapter->dev, &addr, __i2c_check_addr_busy); - if (!result && i2c_parent_is_i2c_adapter(adapter)) - result = i2c_check_mux_parents( - to_i2c_adapter(adapter->dev.parent), addr); + if (!result && parent) + result = i2c_check_mux_parents(parent, addr); return result; } @@ -453,11 +453,11 @@ static int i2c_check_mux_children(struct device *dev, void *addrp) static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) { + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); int result = 0; - if (i2c_parent_is_i2c_adapter(adapter)) - result = i2c_check_mux_parents( - to_i2c_adapter(adapter->dev.parent), addr); + if (parent) + result = i2c_check_mux_parents(parent, addr); if (!result) result = device_for_each_child(&adapter->dev, &addr, @@ -472,8 +472,10 @@ static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr) */ void i2c_lock_adapter(struct i2c_adapter *adapter) { - if (i2c_parent_is_i2c_adapter(adapter)) - i2c_lock_adapter(to_i2c_adapter(adapter->dev.parent)); + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); + + if (parent) + i2c_lock_adapter(parent); else rt_mutex_lock(&adapter->bus_lock); } @@ -485,8 +487,10 @@ EXPORT_SYMBOL_GPL(i2c_lock_adapter); */ static int i2c_trylock_adapter(struct i2c_adapter *adapter) { - if (i2c_parent_is_i2c_adapter(adapter)) - return i2c_trylock_adapter(to_i2c_adapter(adapter->dev.parent)); + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); + + if (parent) + return i2c_trylock_adapter(parent); else return rt_mutex_trylock(&adapter->bus_lock); } @@ -497,8 +501,10 @@ static int i2c_trylock_adapter(struct i2c_adapter *adapter) */ void i2c_unlock_adapter(struct i2c_adapter *adapter) { - if (i2c_parent_is_i2c_adapter(adapter)) - i2c_unlock_adapter(to_i2c_adapter(adapter->dev.parent)); + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); + + if (parent) + i2c_unlock_adapter(parent); else rt_mutex_unlock(&adapter->bus_lock); } diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 5f3a52d517c3..cec0f3ba97f8 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -192,13 +192,12 @@ static int i2cdev_check(struct device *dev, void *addrp) /* walk up mux tree */ static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr) { + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); int result; result = device_for_each_child(&adapter->dev, &addr, i2cdev_check); - - if (!result && i2c_parent_is_i2c_adapter(adapter)) - result = i2cdev_check_mux_parents( - to_i2c_adapter(adapter->dev.parent), addr); + if (!result && parent) + result = i2cdev_check_mux_parents(parent, addr); return result; } @@ -222,11 +221,11 @@ static int i2cdev_check_mux_children(struct device *dev, void *addrp) driver bound to it, as NOT busy. */ static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr) { + struct i2c_adapter *parent = i2c_parent_is_i2c_adapter(adapter); int result = 0; - if (i2c_parent_is_i2c_adapter(adapter)) - result = i2cdev_check_mux_parents( - to_i2c_adapter(adapter->dev.parent), addr); + if (parent) + result = i2cdev_check_mux_parents(parent, addr); if (!result) result = device_for_each_child(&adapter->dev, &addr, |