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>
torvalds · Aug 16, 2022 · ed5c2f5 · ed5c2f5
1 parent 6a8f359
commit ed5c2f5
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diff --git a/Documentation/i2c/writing-clients.rst b/Documentation/i2c/writing-clients.rst
@@ -156,7 +156,7 @@ those devices, and a remove() method to unbind.
 ::
 
 	static int foo_probe(struct i2c_client *client);
-	static int foo_remove(struct i2c_client *client);
+	static void foo_remove(struct i2c_client *client);
 
 Remember that the i2c_driver does not create those client handles.  The
 handle may be used during foo_probe().  If foo_probe() reports success

diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
@@ -178,7 +178,7 @@ static int mcu_probe(struct i2c_client *client)
 	return ret;
 }
 
-static int mcu_remove(struct i2c_client *client)
+static void mcu_remove(struct i2c_client *client)
 {
 	struct mcu *mcu = i2c_get_clientdata(client);
 
@@ -193,7 +193,6 @@ static int mcu_remove(struct i2c_client *client)
 
 	mcu_gpiochip_remove(mcu);
 	kfree(mcu);
-	return 0;
 }
 
 static const struct i2c_device_id mcu_ids[] = {

diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
@@ -775,7 +775,7 @@ static int ht16k33_probe(struct i2c_client *client)
 	return err;
 }
 
-static int ht16k33_remove(struct i2c_client *client)
+static void ht16k33_remove(struct i2c_client *client)
 {
 	struct ht16k33_priv *priv = i2c_get_clientdata(client);
 	struct ht16k33_fbdev *fbdev = &priv->fbdev;
@@ -796,8 +796,6 @@ static int ht16k33_remove(struct i2c_client *client)
 		device_remove_file(&client->dev, &dev_attr_map_seg14);
 		break;
 	}
-
-	return 0;
 }
 
 static const struct i2c_device_id ht16k33_i2c_match[] = {

diff --git a/drivers/auxdisplay/lcd2s.c b/drivers/auxdisplay/lcd2s.c
@@ -340,13 +340,12 @@ static int lcd2s_i2c_probe(struct i2c_client *i2c)
 	return err;
 }
 
-static int lcd2s_i2c_remove(struct i2c_client *i2c)
+static void lcd2s_i2c_remove(struct i2c_client *i2c)
 {
 	struct lcd2s_data *lcd2s = i2c_get_clientdata(i2c);
 
 	charlcd_unregister(lcd2s->charlcd);
 	charlcd_free(lcd2s->charlcd);
-	return 0;
 }
 
 static const struct i2c_device_id lcd2s_i2c_id[] = {

diff --git a/drivers/char/ipmi/ipmb_dev_int.c b/drivers/char/ipmi/ipmb_dev_int.c
@@ -341,14 +341,12 @@ static int ipmb_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int ipmb_remove(struct i2c_client *client)
+static void ipmb_remove(struct i2c_client *client)
 {
 	struct ipmb_dev *ipmb_dev = i2c_get_clientdata(client);
 
 	i2c_slave_unregister(client);
 	misc_deregister(&ipmb_dev->miscdev);
-
-	return 0;
 }
 
 static const struct i2c_device_id ipmb_id[] = {

diff --git a/drivers/char/ipmi/ipmi_ipmb.c b/drivers/char/ipmi/ipmi_ipmb.c
@@ -424,7 +424,7 @@ static void ipmi_ipmb_request_events(void *send_info)
 	/* We don't fetch events here. */
 }
 
-static int ipmi_ipmb_remove(struct i2c_client *client)
+static void ipmi_ipmb_remove(struct i2c_client *client)
 {
 	struct ipmi_ipmb_dev *iidev = i2c_get_clientdata(client);
 
@@ -438,8 +438,6 @@ static int ipmi_ipmb_remove(struct i2c_client *client)
 	ipmi_ipmb_stop_thread(iidev);
 
 	ipmi_unregister_smi(iidev->intf);
-
-	return 0;
 }
 
 static int ipmi_ipmb_probe(struct i2c_client *client)

diff --git a/drivers/char/ipmi/ipmi_ssif.c b/drivers/char/ipmi/ipmi_ssif.c
@@ -1281,13 +1281,13 @@ static void shutdown_ssif(void *send_info)
 	}
 }
 
-static int ssif_remove(struct i2c_client *client)
+static void ssif_remove(struct i2c_client *client)
 {
 	struct ssif_info *ssif_info = i2c_get_clientdata(client);
 	struct ssif_addr_info *addr_info;
 
 	if (!ssif_info)
-		return 0;
+		return;
 
 	/*
 	 * After this point, we won't deliver anything asychronously
@@ -1303,8 +1303,6 @@ static int ssif_remove(struct i2c_client *client)
 	}
 
 	kfree(ssif_info);
-
-	return 0;
 }
 
 static int read_response(struct i2c_client *client, unsigned char *resp)

diff --git a/drivers/char/tpm/st33zp24/i2c.c b/drivers/char/tpm/st33zp24/i2c.c
@@ -264,13 +264,11 @@ static int st33zp24_i2c_probe(struct i2c_client *client,
  * @param: client, the i2c_client description (TPM I2C description).
  * @return: 0 in case of success.
  */
-static int st33zp24_i2c_remove(struct i2c_client *client)
+static void st33zp24_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
 
 	st33zp24_remove(chip);
-
-	return 0;
 }
 
 static const struct i2c_device_id st33zp24_i2c_id[] = {

diff --git a/drivers/char/tpm/tpm_i2c_atmel.c b/drivers/char/tpm/tpm_i2c_atmel.c
@@ -179,12 +179,11 @@ static int i2c_atmel_probe(struct i2c_client *client,
 	return tpm_chip_register(chip);
 }
 
-static int i2c_atmel_remove(struct i2c_client *client)
+static void i2c_atmel_remove(struct i2c_client *client)
 {
 	struct device *dev = &(client->dev);
 	struct tpm_chip *chip = dev_get_drvdata(dev);
 	tpm_chip_unregister(chip);
-	return 0;
 }
 
 static const struct i2c_device_id i2c_atmel_id[] = {

diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c
@@ -706,15 +706,13 @@ static int tpm_tis_i2c_probe(struct i2c_client *client,
 	return rc;
 }
 
-static int tpm_tis_i2c_remove(struct i2c_client *client)
+static void tpm_tis_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = tpm_dev.chip;
 
 	tpm_chip_unregister(chip);
 	release_locality(chip, tpm_dev.locality, 1);
 	tpm_dev.client = NULL;
-
-	return 0;
 }
 
 static struct i2c_driver tpm_tis_i2c_driver = {

diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -622,12 +622,11 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
 	return tpm_chip_register(chip);
 }
 
-static int i2c_nuvoton_remove(struct i2c_client *client)
+static void i2c_nuvoton_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
 
 	tpm_chip_unregister(chip);
-	return 0;
 }
 
 static const struct i2c_device_id i2c_nuvoton_id[] = {

diff --git a/drivers/char/tpm/tpm_tis_i2c.c b/drivers/char/tpm/tpm_tis_i2c.c
@@ -351,13 +351,12 @@ static int tpm_tis_i2c_probe(struct i2c_client *dev,
 				 NULL);
 }
 
-static int tpm_tis_i2c_remove(struct i2c_client *client)
+static void tpm_tis_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
 
 	tpm_chip_unregister(chip);
 	tpm_tis_remove(chip);
-	return 0;
 }
 
 static const struct i2c_device_id tpm_tis_i2c_id[] = {

diff --git a/drivers/char/tpm/tpm_tis_i2c_cr50.c b/drivers/char/tpm/tpm_tis_i2c_cr50.c
@@ -763,20 +763,18 @@ static int tpm_cr50_i2c_probe(struct i2c_client *client)
  * - 0:		Success.
  * - -errno:	A POSIX error code.
  */
-static int tpm_cr50_i2c_remove(struct i2c_client *client)
+static void tpm_cr50_i2c_remove(struct i2c_client *client)
 {
 	struct tpm_chip *chip = i2c_get_clientdata(client);
 	struct device *dev = &client->dev;
 
 	if (!chip) {
 		dev_crit(dev, "Could not get client data at remove, memory corruption ahead\n");
-		return 0;
+		return;
 	}
 
 	tpm_chip_unregister(chip);
 	tpm_cr50_release_locality(chip, true);
-
-	return 0;
 }
 
 static SIMPLE_DEV_PM_OPS(cr50_i2c_pm, tpm_pm_suspend, tpm_pm_resume);

diff --git a/drivers/clk/clk-cdce706.c b/drivers/clk/clk-cdce706.c
@@ -665,10 +665,9 @@ static int cdce706_probe(struct i2c_client *client)
 				      cdce);
 }
 
-static int cdce706_remove(struct i2c_client *client)
+static void cdce706_remove(struct i2c_client *client)
 {
 	of_clk_del_provider(client->dev.of_node);
-	return 0;
 }
 
 

diff --git a/drivers/clk/clk-cs2000-cp.c b/drivers/clk/clk-cs2000-cp.c
@@ -557,7 +557,7 @@ static int cs2000_version_print(struct cs2000_priv *priv)
 	return 0;
 }
 
-static int cs2000_remove(struct i2c_client *client)
+static void cs2000_remove(struct i2c_client *client)
 {
 	struct cs2000_priv *priv = i2c_get_clientdata(client);
 	struct device *dev = priv_to_dev(priv);
@@ -566,8 +566,6 @@ static int cs2000_remove(struct i2c_client *client)
 	of_clk_del_provider(np);
 
 	clk_hw_unregister(&priv->hw);
-
-	return 0;
 }
 
 static int cs2000_probe(struct i2c_client *client)

diff --git a/drivers/clk/clk-si514.c b/drivers/clk/clk-si514.c
@@ -370,10 +370,9 @@ static int si514_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int si514_remove(struct i2c_client *client)
+static void si514_remove(struct i2c_client *client)
 {
 	of_clk_del_provider(client->dev.of_node);
-	return 0;
 }
 
 static const struct i2c_device_id si514_id[] = {

diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
@@ -1796,7 +1796,7 @@ static int si5341_probe(struct i2c_client *client)
 	return err;
 }
 
-static int si5341_remove(struct i2c_client *client)
+static void si5341_remove(struct i2c_client *client)
 {
 	struct clk_si5341 *data = i2c_get_clientdata(client);
 	int i;
@@ -1807,8 +1807,6 @@ static int si5341_remove(struct i2c_client *client)
 		if (data->clk[i].vddo_reg)
 			regulator_disable(data->clk[i].vddo_reg);
 	}
-
-	return 0;
 }
 
 static const struct i2c_device_id si5341_id[] = {

diff --git a/drivers/clk/clk-si5351.c b/drivers/clk/clk-si5351.c
@@ -1651,11 +1651,9 @@ static int si5351_i2c_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int si5351_i2c_remove(struct i2c_client *client)
+static void si5351_i2c_remove(struct i2c_client *client)
 {
 	of_clk_del_provider(client->dev.of_node);
-
-	return 0;
 }
 
 static struct i2c_driver si5351_driver = {

diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c
@@ -498,10 +498,9 @@ static int si570_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int si570_remove(struct i2c_client *client)
+static void si570_remove(struct i2c_client *client)
 {
 	of_clk_del_provider(client->dev.of_node);
-	return 0;
 }
 
 static const struct of_device_id clk_si570_of_match[] = {

diff --git a/drivers/clk/clk-versaclock5.c b/drivers/clk/clk-versaclock5.c
@@ -1138,16 +1138,14 @@ static int vc5_probe(struct i2c_client *client)
 	return ret;
 }
 
-static int vc5_remove(struct i2c_client *client)
+static void vc5_remove(struct i2c_client *client)
 {
 	struct vc5_driver_data *vc5 = i2c_get_clientdata(client);
 
 	of_clk_del_provider(client->dev.of_node);
 
 	if (vc5->chip_info->flags & VC5_HAS_INTERNAL_XTAL)
 		clk_unregister_fixed_rate(vc5->pin_xin);
-
-	return 0;
 }
 
 static int __maybe_unused vc5_suspend(struct device *dev)

diff --git a/drivers/crypto/atmel-ecc.c b/drivers/crypto/atmel-ecc.c
@@ -343,7 +343,7 @@ static int atmel_ecc_probe(struct i2c_client *client,
 	return ret;
 }
 
-static int atmel_ecc_remove(struct i2c_client *client)
+static void atmel_ecc_remove(struct i2c_client *client)
 {
 	struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
 
@@ -358,16 +358,14 @@ static int atmel_ecc_remove(struct i2c_client *client)
 		 * accessing the freed memory.
 		 */
 		dev_emerg(&client->dev, "Device is busy, expect memory corruption.\n");
-		return 0;
+		return;
 	}
 
 	crypto_unregister_kpp(&atmel_ecdh_nist_p256);
 
 	spin_lock(&driver_data.i2c_list_lock);
 	list_del(&i2c_priv->i2c_client_list_node);
 	spin_unlock(&driver_data.i2c_list_lock);
-
-	return 0;
 }
 
 #ifdef CONFIG_OF

diff --git a/drivers/crypto/atmel-sha204a.c b/drivers/crypto/atmel-sha204a.c
@@ -116,18 +116,16 @@ static int atmel_sha204a_probe(struct i2c_client *client,
 	return ret;
 }
 
-static int atmel_sha204a_remove(struct i2c_client *client)
+static void atmel_sha204a_remove(struct i2c_client *client)
 {
 	struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
 
 	if (atomic_read(&i2c_priv->tfm_count)) {
 		dev_emerg(&client->dev, "Device is busy, will remove it anyhow\n");
-		return 0;
+		return;
 	}
 
 	kfree((void *)i2c_priv->hwrng.priv);
-
-	return 0;
 }
 
 static const struct of_device_id atmel_sha204a_dt_ids[] = {

diff --git a/drivers/extcon/extcon-rt8973a.c b/drivers/extcon/extcon-rt8973a.c
@@ -646,13 +646,11 @@ static int rt8973a_muic_i2c_probe(struct i2c_client *i2c,
 	return 0;
 }
 
-static int rt8973a_muic_i2c_remove(struct i2c_client *i2c)
+static void rt8973a_muic_i2c_remove(struct i2c_client *i2c)
 {
 	struct rt8973a_muic_info *info = i2c_get_clientdata(i2c);
 
 	regmap_del_irq_chip(info->irq, info->irq_data);
-
-	return 0;
 }
 
 static const struct of_device_id rt8973a_dt_match[] = {

diff --git a/drivers/gpio/gpio-adp5588.c b/drivers/gpio/gpio-adp5588.c
@@ -409,14 +409,12 @@ static int adp5588_gpio_probe(struct i2c_client *client)
 	return 0;
 }
 
-static int adp5588_gpio_remove(struct i2c_client *client)
+static void adp5588_gpio_remove(struct i2c_client *client)
 {
 	struct adp5588_gpio *dev = i2c_get_clientdata(client);
 
 	if (dev->client->irq)
 		free_irq(dev->client->irq, dev);
-
-	return 0;
 }
 
 static const struct i2c_device_id adp5588_gpio_id[] = {