Merge tag 'i2c-for-7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "Core:
   - smbus: fix a potential uninitialization bug

  Tegra:
   - drop runtime PM reference when exiting on mutex_lock failure
   - preserve transfer errors when releasing the mutex"

* tag 'i2c-for-7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: smbus: fix a potential uninitialization bug
  i2c: tegra: make tegra_i2c_mutex_unlock() return void
  i2c: tegra: fix pm_runtime leak on mutex_lock failure

Author: torvalds

drivers/i2c/busses/i2c-tegra.c

@@ -589,25 +589,22 @@ static int tegra_i2c_mutex_lock(struct tegra_i2c_dev *i2c_dev)
 	return ret;
 }
 
-static int tegra_i2c_mutex_unlock(struct tegra_i2c_dev *i2c_dev)
+static void tegra_i2c_mutex_unlock(struct tegra_i2c_dev *i2c_dev)
 {
 	unsigned int reg = i2c_dev->hw->regs->sw_mutex;
 	u32 val, id;
 
 	if (!i2c_dev->hw->has_mutex)
-		return 0;
+		return;
 
 	val = readl(i2c_dev->base + reg);
 
 	id = FIELD_GET(I2C_SW_MUTEX_GRANT, val);
-	if (id && id != I2C_SW_MUTEX_ID_CCPLEX) {
-		dev_warn(i2c_dev->dev, "unable to unlock mutex, mutex is owned by: %u\n", id);
-		return -EPERM;
-	}
+	if (WARN(id && id != I2C_SW_MUTEX_ID_CCPLEX,
+		 "unable to unlock mutex, mutex is owned by: %u\n", id))
+		return;
 
 	writel(0, i2c_dev->base + reg);
-
-	return 0;
 }
 
 static void tegra_i2c_mask_irq(struct tegra_i2c_dev *i2c_dev, u32 mask)
@@ -1666,8 +1663,10 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 	}
 
 	ret = tegra_i2c_mutex_lock(i2c_dev);
-	if (ret)
+	if (ret) {
+		pm_runtime_put(i2c_dev->dev);
 		return ret;
+	}
 
 	for (i = 0; i < num; i++) {
 		enum msg_end_type end_type = MSG_END_STOP;
@@ -1698,7 +1697,7 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
 			break;
 	}
 
-	ret = tegra_i2c_mutex_unlock(i2c_dev);
+	tegra_i2c_mutex_unlock(i2c_dev);
 	pm_runtime_put(i2c_dev->dev);
 
 	return ret ?: i;

drivers/i2c/i2c-core-smbus.c

@@ -353,6 +353,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr,
 			  && size != I2C_SMBUS_I2C_BLOCK_DATA);
 
 	msgbuf0[0] = command;
+	msgbuf1[0] = 0;
 	switch (size) {
 	case I2C_SMBUS_QUICK:
 		msg[0].len = 0;