gpio: pcf857x: Make teardown callback return void

All teardown functions return 0. Also there is little sense in returning
a negative error code from an i2c remove function as this only results in
emitting an error message but the device is removed nevertheless.

This patch is a preparation for making i2c remove callbacks return void.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

arch/arm/mach-davinci/board-da830-evm.c

@@ -473,11 +473,10 @@ static int __init da830_evm_ui_expander_setup(struct i2c_client *client,
 	return 0;
 }
 
-static int da830_evm_ui_expander_teardown(struct i2c_client *client, int gpio,
+static void da830_evm_ui_expander_teardown(struct i2c_client *client, int gpio,
 		unsigned ngpio, void *context)
 {
 	gpio_free(gpio + 6);
-	return 0;
 }
 
 static struct pcf857x_platform_data __initdata da830_evm_ui_expander_info = {

arch/arm/mach-davinci/board-dm644x-evm.c

@@ -366,14 +366,13 @@ evm_led_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 	return status;
 }
 
-static int
+static void
 evm_led_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 {
 	if (evm_led_dev) {
 		platform_device_unregister(evm_led_dev);
 		evm_led_dev = NULL;
 	}
-	return 0;
 }
 
 static struct pcf857x_platform_data pcf_data_u2 = {
@@ -428,7 +427,7 @@ evm_u18_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 	return 0;
 }
 
-static int
+static void
 evm_u18_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 {
 	gpio_free(gpio + 1);
@@ -439,7 +438,6 @@ evm_u18_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 		device_remove_file(&client->dev, &dev_attr_user_sw);
 		gpio_free(sw_gpio);
 	}
-	return 0;
 }
 
 static struct pcf857x_platform_data pcf_data_u18 = {
@@ -488,7 +486,7 @@ evm_u35_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 	return 0;
 }
 
-static int
+static void
 evm_u35_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 {
 	gpio_free(gpio + 7);
@@ -498,7 +496,6 @@ evm_u35_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
 	gpio_free(gpio + 2);
 	gpio_free(gpio + 1);
 	gpio_free(gpio + 0);
-	return 0;
 }
 
 static struct pcf857x_platform_data pcf_data_u35 = {

arch/arm/mach-davinci/board-dm646x-evm.c

@@ -315,15 +315,13 @@ static int evm_pcf_setup(struct i2c_client *client, int gpio,
 	return evm_led_setup(client, gpio+4, 4, c);
 }
 
-static int evm_pcf_teardown(struct i2c_client *client, int gpio,
+static void evm_pcf_teardown(struct i2c_client *client, int gpio,
 			unsigned int ngpio, void *c)
 {
 	BUG_ON(ngpio < 8);
 
 	evm_sw_teardown(client, gpio, 4, c);
 	evm_led_teardown(client, gpio+4, 4, c);
-
-	return 0;
 }
 
 static struct pcf857x_platform_data pcf_data = {

drivers/gpio/gpio-pcf857x.c

@@ -396,20 +396,12 @@ static int pcf857x_remove(struct i2c_client *client)
 {
 	struct pcf857x_platform_data	*pdata = dev_get_platdata(&client->dev);
 	struct pcf857x			*gpio = i2c_get_clientdata(client);
-	int				status = 0;
 
-	if (pdata && pdata->teardown) {
-		status = pdata->teardown(client,
-				gpio->chip.base, gpio->chip.ngpio,
+	if (pdata && pdata->teardown)
+		pdata->teardown(client, gpio->chip.base, gpio->chip.ngpio,
 				pdata->context);
-		if (status < 0) {
-			dev_err(&client->dev, "%s --> %d\n",
-					"teardown", status);
-			return status;
-		}
-	}
 
-	return status;
+	return 0;
 }
 
 static void pcf857x_shutdown(struct i2c_client *client)

include/linux/platform_data/pcf857x.h

@@ -36,7 +36,7 @@ struct pcf857x_platform_data {
 	int		(*setup)(struct i2c_client *client,
 					int gpio, unsigned ngpio,
 					void *context);
-	int		(*teardown)(struct i2c_client *client,
+	void		(*teardown)(struct i2c_client *client,
 					int gpio, unsigned ngpio,
 					void *context);
 	void		*context;