[PATCH 01/11] i2c: add helpers for locking the I2C segment

[Peter Rosin]

This is what almost all drivers want to do. By only advertising
i2c_lock_adapter, they are tricked into locking the root adapter
which is too big of a hammer in most cases.

While at it, convert all open-coded locking of the I2C segment.

Signed-off-by: Peter Rosin <peda@xxxxxxxxxx>
---
 drivers/i2c/i2c-core-base.c  |  6 +++---
 drivers/i2c/i2c-core-smbus.c |  4 ++--
 include/linux/i2c.h          | 18 ++++++++++++++++++
 3 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 1ba40bb2b966..3eb09dc20573 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1932,16 +1932,16 @@ int i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 #endif
 
 		if (in_atomic() || irqs_disabled()) {
-			ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT);
+			ret = i2c_trylock_segment(adap);
 			if (!ret)
 				/* I2C activity is ongoing. */
 				return -EAGAIN;
 		} else {
-			i2c_lock_bus(adap, I2C_LOCK_SEGMENT);
+			i2c_lock_segment(adap);
 		}
 
 		ret = __i2c_transfer(adap, msgs, num);
-		i2c_unlock_bus(adap, I2C_LOCK_SEGMENT);
+		i2c_unlock_segment(adap);
 
 		return ret;
 	} else {
diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c
index b5aec33002c3..8a820fdef3e0 100644
--- a/drivers/i2c/i2c-core-smbus.c
+++ b/drivers/i2c/i2c-core-smbus.c
@@ -537,7 +537,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
 	flags &= I2C_M_TEN | I2C_CLIENT_PEC | I2C_CLIENT_SCCB;
 
 	if (adapter->algo->smbus_xfer) {
-		i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
+		i2c_lock_segment(adapter);
 
 		/* Retry automatically on arbitration loss */
 		orig_jiffies = jiffies;
@@ -551,7 +551,7 @@ s32 i2c_smbus_xfer(struct i2c_adapter *adapter, u16 addr, unsigned short flags,
 				       orig_jiffies + adapter->timeout))
 				break;
 		}
-		i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
+		i2c_unlock_segment(adapter);
 
 		if (res != -EOPNOTSUPP || !adapter->algo->master_xfer)
 			goto trace;
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 44ad14e016b5..c9080d49e988 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -768,6 +768,24 @@ i2c_unlock_adapter(struct i2c_adapter *adapter)
 	i2c_unlock_bus(adapter, I2C_LOCK_ROOT_ADAPTER);
 }
 
+static inline void
+i2c_lock_segment(struct i2c_adapter *adapter)
+{
+	i2c_lock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
+static inline int
+i2c_trylock_segment(struct i2c_adapter *adapter)
+{
+	return i2c_trylock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
+static inline void
+i2c_unlock_segment(struct i2c_adapter *adapter)
+{
+	i2c_unlock_bus(adapter, I2C_LOCK_SEGMENT);
+}
+
 /*flags for the client struct: */
 #define I2C_CLIENT_PEC		0x04	/* Use Packet Error Checking */
 #define I2C_CLIENT_TEN		0x10	/* we have a ten bit chip address */
-- 
2.11.0