i2c: Make remove callback return void

The value returned by an i2c driver's remove function is mostly ignored.
(Only an error message is printed if the value is non-zero that the
error is ignored.)

So change the prototype of the remove function to return no value. This
way driver authors are not tempted to assume that passing an error to
the upper layer is a good idea. All drivers are adapted accordingly.
There is no intended change of behaviour, all callbacks were prepared to
return 0 before.

Reviewed-by: Peter Senna Tschudin <peter.senna@gmail.com>
Reviewed-by: Jeremy Kerr <jk@codeconstruct.com.au>
Reviewed-by: Benjamin Mugnier <benjamin.mugnier@foss.st.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Crt Mori <cmo@melexis.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Marek Behún <kabel@kernel.org> # for leds-turris-omnia
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Machata <petrm@nvidia.com> # for mlxsw
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for surface3_power
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> # for bmc150-accel-i2c + kxcjk-1013
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> # for media/* + staging/media/*
Acked-by: Miguel Ojeda <ojeda@kernel.org> # for auxdisplay/ht16k33 + auxdisplay/lcd2s
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # for versaclock5
Reviewed-by: Ajay Gupta <ajayg@nvidia.com> # for ucsi_ccg
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # for iio
Acked-by: Peter Rosin <peda@axentia.se> # for i2c-mux-*, max9860
Acked-by: Adrien Grassein <adrien.grassein@gmail.com> # for lontium-lt8912b
Reviewed-by: Jean Delvare <jdelvare@suse.de> # for hwmon, i2c-core and i2c/muxes
Acked-by: Corey Minyard <cminyard@mvista.com> # for IPMI
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com> # for drivers/power
Acked-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

4 files changed, 4 insertions, 12 deletions

diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index 262bd7665b33..6dbe9d5e08a2 100644
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -880,7 +880,7 @@ error_disable_reg:
 	return ret;
 }
 
-static int ad799x_remove(struct i2c_client *client)
+static void ad799x_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ad799x_state *st = iio_priv(indio_dev);
@@ -892,8 +892,6 @@ static int ad799x_remove(struct i2c_client *client)
 		regulator_disable(st->vref);
 	regulator_disable(st->reg);
 	kfree(st->rx_buf);
-
-	return 0;
 }
 
 static int ad799x_suspend(struct device *dev)
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
index 240e6c420701..910e7e965fc4 100644
--- a/drivers/iio/adc/ina2xx-adc.c
+++ b/drivers/iio/adc/ina2xx-adc.c
@@ -1034,7 +1034,7 @@ static int ina2xx_probe(struct i2c_client *client,
 	return iio_device_register(indio_dev);
 }
 
-static int ina2xx_remove(struct i2c_client *client)
+static void ina2xx_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ina2xx_chip_info *chip = iio_priv(indio_dev);
@@ -1048,8 +1048,6 @@ static int ina2xx_remove(struct i2c_client *client)
 	if (ret)
 		dev_warn(&client->dev, "Failed to power down device (%pe)\n",
 			 ERR_PTR(ret));
-
-	return 0;
 }
 
 static const struct i2c_device_id ina2xx_id[] = {
diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c
index f7c786f37ceb..d58a432bafe1 100644
--- a/drivers/iio/adc/ltc2497.c
+++ b/drivers/iio/adc/ltc2497.c
@@ -74,13 +74,11 @@ static int ltc2497_probe(struct i2c_client *client,
 	return ltc2497core_probe(dev, indio_dev);
 }
 
-static int ltc2497_remove(struct i2c_client *client)
+static void ltc2497_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 
 	ltc2497core_remove(indio_dev);
-
-	return 0;
 }
 
 static const struct i2c_device_id ltc2497_id[] = {
diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index e3dfc155fbe2..8bceba694026 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -1094,7 +1094,7 @@ static int ads1015_probe(struct i2c_client *client,
 	return 0;
 }
 
-static int ads1015_remove(struct i2c_client *client)
+static void ads1015_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);
 	struct ads1015_data *data = iio_priv(indio_dev);
@@ -1110,8 +1110,6 @@ static int ads1015_remove(struct i2c_client *client)
 	if (ret)
 		dev_warn(&client->dev, "Failed to power down (%pe)\n",
 			 ERR_PTR(ret));
-
-	return 0;
 }
 
 #ifdef CONFIG_PM