1 files changed, 55 insertions, 17 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 9cb277d6aa48..01233f0f7771 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -183,15 +183,21 @@ int i2c_add_adapter(struct i2c_adapter *adap)
         sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
         adap->dev.driver = &i2c_adapter_driver;
         adap->dev.release = &i2c_adapter_dev_release;
-        device_register(&adap->dev);
-        device_create_file(&adap->dev, &dev_attr_name);
+        res = device_register(&adap->dev);
+        if (res)
+                goto out_list;
+        res = device_create_file(&adap->dev, &dev_attr_name);
+        if (res)
+                goto out_unregister;
 
         /* Add this adapter to the i2c_adapter class */
         memset(&adap->class_dev, 0x00, sizeof(struct class_device));
         adap->class_dev.dev = &adap->dev;
         adap->class_dev.class = &i2c_adapter_class;
         strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);
-        class_device_register(&adap->class_dev);
+        res = class_device_register(&adap->class_dev);
+        if (res)
+                goto out_remove_name;
 
         dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
@@ -206,6 +212,17 @@ int i2c_add_adapter(struct i2c_adapter *adap)
 out_unlock:
         mutex_unlock(&core_lists);
         return res;
+
+out_remove_name:
+        device_remove_file(&adap->dev, &dev_attr_name);
+out_unregister:
+        init_completion(&adap->dev_released); /* Needed? */
+        device_unregister(&adap->dev);
+        wait_for_completion(&adap->dev_released);
+out_list:
+        list_del(&adap->list);
+        idr_remove(&i2c_adapter_idr, adap->nr);
+        goto out_unlock;
 }
 
 
@@ -394,14 +411,14 @@ int i2c_check_addr(struct i2c_adapter *adapter, int addr)
 int i2c_attach_client(struct i2c_client *client)
 {
         struct i2c_adapter *adapter = client->adapter;
+        int res = 0;
 
         mutex_lock(&adapter->clist_lock);
         if (__i2c_check_addr(client->adapter, client->addr)) {
-                mutex_unlock(&adapter->clist_lock);
-                return -EBUSY;
+                res = -EBUSY;
+                goto out_unlock;
         }
         list_add_tail(&client->list,&adapter->clients);
-        mutex_unlock(&adapter->clist_lock);
         
         if (adapter->client_register)  {
                 if (adapter->client_register(client))  {
@@ -422,10 +439,26 @@ int i2c_attach_client(struct i2c_client *client)
                 "%d-%04x", i2c_adapter_id(adapter), client->addr);
         dev_dbg(&adapter->dev, "client [%s] registered with bus id %s\n",
                 client->name, client->dev.bus_id);
-        device_register(&client->dev);
-        device_create_file(&client->dev, &dev_attr_client_name);
-        
-        return 0;
+        res = device_register(&client->dev);
+        if (res)
+                goto out_list;
+        res = device_create_file(&client->dev, &dev_attr_client_name);
+        if (res)
+                goto out_unregister;
+
+out_unlock:
+        mutex_unlock(&adapter->clist_lock);
+        return res;
+
+out_unregister:
+        init_completion(&client->released); /* Needed? */
+        device_unregister(&client->dev);
+        wait_for_completion(&client->released);
+out_list:
+        list_del(&client->list);
+        dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x "
+                "(%d)\n", client->name, client->addr, res);
+        goto out_unlock;
 }
 
 
@@ -674,11 +707,16 @@ static int i2c_probe_address(struct i2c_adapter *adapter, int addr, int kind,
 
         /* Finally call the custom detection function */
         err = found_proc(adapter, addr, kind);
-
         /* -ENODEV can be returned if there is a chip at the given address
            but it isn't supported by this chip driver. We catch it here as
            this isn't an error. */
-        return (err == -ENODEV) ? 0 : err;
+        if (err == -ENODEV)
+                err = 0;
+
+        if (err)
+                dev_warn(&adapter->dev, "Client creation failed at 0x%x (%d)\n",
+                         addr, err);
+        return err;
 }
 
 int i2c_probe(struct i2c_adapter *adapter,
@@ -868,7 +906,7 @@ s32 i2c_smbus_read_byte(struct i2c_client *client)
                            I2C_SMBUS_READ,0,I2C_SMBUS_BYTE, &data))
                 return -1;
         else
-                return 0x0FF & data.byte;
+                return data.byte;
 }
 
 s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value)
@@ -884,7 +922,7 @@ s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command)
                            I2C_SMBUS_READ,command, I2C_SMBUS_BYTE_DATA,&data))
                 return -1;
         else
-                return 0x0FF & data.byte;
+                return data.byte;
 }
 
 s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value)
@@ -903,7 +941,7 @@ s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command)
                            I2C_SMBUS_READ,command, I2C_SMBUS_WORD_DATA, &data))
                 return -1;
         else
-                return 0x0FFFF & data.word;
+                return data.word;
 }
 
 s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
@@ -1006,7 +1044,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
                 else {
                         msg[0].len=3;
                         msgbuf0[1] = data->word & 0xff;
-                        msgbuf0[2] = (data->word >> 8) & 0xff;
+                        msgbuf0[2] = data->word >> 8;
                 }
                 break;
         case I2C_SMBUS_PROC_CALL:
@@ -1015,7 +1053,7 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr,
                 msg[0].len = 3;
                 msg[1].len = 2;
                 msgbuf0[1] = data->word & 0xff;
-                msgbuf0[2] = (data->word >> 8) & 0xff;
+                msgbuf0[2] = data->word >> 8;
                 break;
         case I2C_SMBUS_BLOCK_DATA:
                 if (read_write == I2C_SMBUS_READ) {