diff --git a/Documentation/i2c/porting-clients b/Documentation/i2c/porting-clients
index 105c618..68bcd66 100644
--- a/Documentation/i2c/porting-clients
+++ b/Documentation/i2c/porting-clients
@@ -94,7 +94,8 @@
   limited to the strictly necessary steps.
 
 * [Detach] Get rid of data, remove the call to
-  i2c_deregister_entry.
+  i2c_deregister_entry. Do not log an error message if
+  i2c_detach_client fails, as i2c-core will now do it for you.
 
 * [Update] Don't access client->data directly, use
   i2c_get_clientdata(client) instead.
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 522ae01..7e2a8f1 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -489,10 +489,8 @@
     /* SENSORS ONLY END */
 
     /* Try to detach the client from i2c space */
-    if ((err = i2c_detach_client(client))) {
-      printk("foo.o: Client deregistration failed, client not detached.\n");
+    if ((err = i2c_detach_client(client)))
       return err;
-    }
 
     /* HYBRID SENSORS CHIP ONLY START */
     if i2c_is_isa_client(client)
diff --git a/drivers/hwmon/adm1021.c b/drivers/hwmon/adm1021.c
index 2a34139..da3e2c9 100644
--- a/drivers/hwmon/adm1021.c
+++ b/drivers/hwmon/adm1021.c
@@ -328,10 +328,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/adm1025.c b/drivers/hwmon/adm1025.c
index bdba01e..181dadf 100644
--- a/drivers/hwmon/adm1025.c
+++ b/drivers/hwmon/adm1025.c
@@ -517,11 +517,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/adm9240.c b/drivers/hwmon/adm9240.c
index d521000..82edf28 100644
--- a/drivers/hwmon/adm9240.c
+++ b/drivers/hwmon/adm9240.c
@@ -645,11 +645,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-				"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/asb100.c b/drivers/hwmon/asb100.c
index 290f7d2..c6a2c94 100644
--- a/drivers/hwmon/asb100.c
+++ b/drivers/hwmon/asb100.c
@@ -867,11 +867,8 @@
 	if (data)
 		hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "client deregistration failed; "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	/* main client */
 	if (data)
diff --git a/drivers/hwmon/ds1621.c b/drivers/hwmon/ds1621.c
index 4a316a7..3ac37e9 100644
--- a/drivers/hwmon/ds1621.c
+++ b/drivers/hwmon/ds1621.c
@@ -282,11 +282,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 
diff --git a/drivers/hwmon/fscher.c b/drivers/hwmon/fscher.c
index c7caa95..ddf22fb 100644
--- a/drivers/hwmon/fscher.c
+++ b/drivers/hwmon/fscher.c
@@ -383,11 +383,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/fscpos.c b/drivers/hwmon/fscpos.c
index fd75e44..489870a 100644
--- a/drivers/hwmon/fscpos.c
+++ b/drivers/hwmon/fscpos.c
@@ -549,11 +549,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, client"
-							" not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 	kfree(data);
 	return 0;
 }
diff --git a/drivers/hwmon/gl518sm.c b/drivers/hwmon/gl518sm.c
index 34d85b1..63a2756 100644
--- a/drivers/hwmon/gl518sm.c
+++ b/drivers/hwmon/gl518sm.c
@@ -492,11 +492,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/gl520sm.c b/drivers/hwmon/gl520sm.c
index b129d15..ff71eb7 100644
--- a/drivers/hwmon/gl520sm.c
+++ b/drivers/hwmon/gl520sm.c
@@ -654,11 +654,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 0a8d795..b1719f4 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -945,11 +945,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-			"Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	if(i2c_is_isa_client(client))
 		release_region(client->addr, IT87_EXTENT);
diff --git a/drivers/hwmon/lm63.c b/drivers/hwmon/lm63.c
index e19b11f..736126d 100644
--- a/drivers/hwmon/lm63.c
+++ b/drivers/hwmon/lm63.c
@@ -520,11 +520,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
index 784935f..21b767a 100644
--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -683,11 +683,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		    "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	if(i2c_is_isa_client(client))
 		release_region(client->addr, LM78_EXTENT);
diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index fa2cb17..36a0cda 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -510,11 +510,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c
index 0223b4d..f3557f8 100644
--- a/drivers/hwmon/lm83.c
+++ b/drivers/hwmon/lm83.c
@@ -363,11 +363,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		    "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/lm87.c b/drivers/hwmon/lm87.c
index 1dc3bf5..f0ffe58 100644
--- a/drivers/hwmon/lm87.c
+++ b/drivers/hwmon/lm87.c
@@ -734,11 +734,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 4b914ec..fbf9dac 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -562,11 +562,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/lm92.c b/drivers/hwmon/lm92.c
index 9c43120..9740ee2 100644
--- a/drivers/hwmon/lm92.c
+++ b/drivers/hwmon/lm92.c
@@ -399,11 +399,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/max1619.c b/drivers/hwmon/max1619.c
index 5f03765..a53d7df 100644
--- a/drivers/hwmon/max1619.c
+++ b/drivers/hwmon/max1619.c
@@ -322,11 +322,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/hwmon/pc87360.c b/drivers/hwmon/pc87360.c
index 4041488..1f1b3ca 100644
--- a/drivers/hwmon/pc87360.c
+++ b/drivers/hwmon/pc87360.c
@@ -984,11 +984,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((i = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((i = i2c_detach_client(client)))
 		return i;
-	}
 
 	for (i = 0; i < 3; i++) {
 		if (data->address[i]) {
diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 6724629..55716cb 100644
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -618,11 +618,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		    "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	release_region(client->addr, SIS5595_EXTENT);
 
diff --git a/drivers/hwmon/smsc47b397.c b/drivers/hwmon/smsc47b397.c
index dddc94a..7fe7157 100644
--- a/drivers/hwmon/smsc47b397.c
+++ b/drivers/hwmon/smsc47b397.c
@@ -214,11 +214,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	release_region(client->addr, SMSC_EXTENT);
 	kfree(data);
diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index 8126fdd..9da5d54 100644
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -497,11 +497,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	release_region(client->addr, SMSC_EXTENT);
 	kfree(data);
diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
index cd3732c..d9251fb 100644
--- a/drivers/hwmon/via686a.c
+++ b/drivers/hwmon/via686a.c
@@ -700,11 +700,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		"Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	release_region(client->addr, VIA686A_EXTENT);
 	kfree(data);
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c
index b14801c..b60efe8 100644
--- a/drivers/hwmon/w83627ehf.c
+++ b/drivers/hwmon/w83627ehf.c
@@ -774,11 +774,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 	release_region(client->addr, REGION_LENGTH);
 	kfree(data);
 
diff --git a/drivers/hwmon/w83627hf.c b/drivers/hwmon/w83627hf.c
index 9e31f55..f1ae0e0 100644
--- a/drivers/hwmon/w83627hf.c
+++ b/drivers/hwmon/w83627hf.c
@@ -1157,11 +1157,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		       "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	release_region(client->addr, WINB_EXTENT);
 	kfree(data);
diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index 7071855..66835c1 100644
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -1299,11 +1299,8 @@
 	if (i2c_is_isa_client(client))
 		release_region(client->addr, W83781D_EXTENT);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-		       "Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	/* main client */
 	if (data)
diff --git a/drivers/hwmon/w83792d.c b/drivers/hwmon/w83792d.c
index 05f9b92..ea0c351 100644
--- a/drivers/hwmon/w83792d.c
+++ b/drivers/hwmon/w83792d.c
@@ -1396,11 +1396,8 @@
 	if (data)
 		hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-			"Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	/* main client */
 	if (data)
diff --git a/drivers/hwmon/w83l785ts.c b/drivers/hwmon/w83l785ts.c
index 9cd1939..213fb17 100644
--- a/drivers/hwmon/w83l785ts.c
+++ b/drivers/hwmon/w83l785ts.c
@@ -267,11 +267,8 @@
 
 	hwmon_device_unregister(data->class_dev);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(data);
 	return 0;
diff --git a/drivers/i2c/chips/ds1337.c b/drivers/i2c/chips/ds1337.c
index 6ac0a6e..8ab4e23 100644
--- a/drivers/i2c/chips/ds1337.c
+++ b/drivers/i2c/chips/ds1337.c
@@ -353,11 +353,8 @@
 	int err;
 	struct ds1337_data *data = i2c_get_clientdata(client);
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed, "
-			"client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	list_del(&data->list);
 	kfree(data);
diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c
index 88f83ba..9466ada 100644
--- a/drivers/i2c/chips/eeprom.c
+++ b/drivers/i2c/chips/eeprom.c
@@ -230,10 +230,8 @@
 	int err;
 
 	err = i2c_detach_client(client);
-	if (err) {
-		dev_err(&client->dev, "Client deregistration failed, client not detached.\n");
+	if (err)
 		return err;
-	}
 
 	kfree(i2c_get_clientdata(client));
 
diff --git a/drivers/i2c/chips/max6875.c b/drivers/i2c/chips/max6875.c
index d1d4858..52fd6bf 100644
--- a/drivers/i2c/chips/max6875.c
+++ b/drivers/i2c/chips/max6875.c
@@ -242,10 +242,8 @@
 	int err;
 
 	err = i2c_detach_client(client);
-	if (err) {
-		dev_err(&client->dev, "i2c_detach_client() failed\n");
+	if (err)
 		return err;
-	}
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }
diff --git a/drivers/i2c/chips/pca9539.c b/drivers/i2c/chips/pca9539.c
index c5b0523..1500b18 100644
--- a/drivers/i2c/chips/pca9539.c
+++ b/drivers/i2c/chips/pca9539.c
@@ -163,10 +163,8 @@
 {
 	int err;
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev, "Client deregistration failed.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(i2c_get_clientdata(client));
 	return 0;
diff --git a/drivers/i2c/chips/pcf8574.c b/drivers/i2c/chips/pcf8574.c
index 7a1fa79..a109dfd 100644
--- a/drivers/i2c/chips/pcf8574.c
+++ b/drivers/i2c/chips/pcf8574.c
@@ -185,11 +185,8 @@
 {
 	int err;
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-			"Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(i2c_get_clientdata(client));
 	return 0;
diff --git a/drivers/i2c/chips/pcf8591.c b/drivers/i2c/chips/pcf8591.c
index 225b512d..7fce0fc 100644
--- a/drivers/i2c/chips/pcf8591.c
+++ b/drivers/i2c/chips/pcf8591.c
@@ -240,11 +240,8 @@
 {
 	int err;
 
-	if ((err = i2c_detach_client(client))) {
-		dev_err(&client->dev,
-			"Client deregistration failed, client not detached.\n");
+	if ((err = i2c_detach_client(client)))
 		return err;
-	}
 
 	kfree(i2c_get_clientdata(client));
 	return 0;
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7a7837a..b0bceb2 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -449,8 +449,12 @@
 	struct i2c_adapter *adapter = client->adapter;
 	int res = 0;
 	
-	if ((client->flags & I2C_CLIENT_ALLOW_USE) && (client->usage_count > 0))
+	if ((client->flags & I2C_CLIENT_ALLOW_USE)
+	 && (client->usage_count > 0)) {
+		dev_warn(&client->dev, "Client [%s] still busy, "
+			 "can't detach\n", client->name);
 		return -EBUSY;
+	}
 
 	if (adapter->client_unregister)  {
 		res = adapter->client_unregister(client);