[lm-sensors] [PATCH 34/39] w83781d: Fix unchecked return status

[greg@kroah.com (Greg KH)]

From: Jim Cromie <jim.cromie at gmail.com>

w83781d: Fix unchecked return status

Add 2 attr-file groups (for base and model-specific attrs respectively),
create the base group with single call to sysfs_create_group,
check the return code on individual calls to device_create_file for each
of the model-specific attr-files.

Signed-off-by: Jim Cromie <jim.cromie at gmail.com>
Signed-off-by: Jean Delvare <khali at linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at suse.de>
---
 drivers/hwmon/w83781d.c |  277 ++++++++++++++++++++++++-----------------------
 1 files changed, 143 insertions(+), 134 deletions(-)

diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index 95221b1..a4584ec 100644
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -41,6 +41,7 @@ #include <linux/i2c.h>
 #include <linux/i2c-isa.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-vid.h>
+#include <linux/sysfs.h>
 #include <linux/err.h>
 #include <linux/mutex.h>
 #include <asm/io.h>
@@ -360,13 +361,6 @@ sysfs_in_offsets(6);
 sysfs_in_offsets(7);
 sysfs_in_offsets(8);
 
-#define device_create_file_in(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_in##offset##_input); \
-device_create_file(&client->dev, &dev_attr_in##offset##_min); \
-device_create_file(&client->dev, &dev_attr_in##offset##_max); \
-} while (0)
-
 #define show_fan_reg(reg) \
 static ssize_t show_##reg (struct device *dev, char *buf, int nr) \
 { \
@@ -421,12 +415,6 @@ sysfs_fan_min_offset(2);
 sysfs_fan_offset(3);
 sysfs_fan_min_offset(3);
 
-#define device_create_file_fan(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_fan##offset##_input); \
-device_create_file(&client->dev, &dev_attr_fan##offset##_min); \
-} while (0)
-
 #define show_temp_reg(reg) \
 static ssize_t show_##reg (struct device *dev, char *buf, int nr) \
 { \
@@ -497,13 +485,6 @@ sysfs_temp_offsets(1);
 sysfs_temp_offsets(2);
 sysfs_temp_offsets(3);
 
-#define device_create_file_temp(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_temp##offset##_input); \
-device_create_file(&client->dev, &dev_attr_temp##offset##_max); \
-device_create_file(&client->dev, &dev_attr_temp##offset##_max_hyst); \
-} while (0)
-
 static ssize_t
 show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -511,10 +492,8 @@ show_vid_reg(struct device *dev, struct 
 	return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
 }
 
-static
-DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
-#define device_create_file_vid(client) \
-device_create_file(&client->dev, &dev_attr_cpu0_vid);
+static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid_reg, NULL);
+
 static ssize_t
 show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -535,10 +514,8 @@ store_vrm_reg(struct device *dev, struct
 	return count;
 }
 
-static
-DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
-#define device_create_file_vrm(client) \
-device_create_file(&client->dev, &dev_attr_vrm);
+static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);
+
 static ssize_t
 show_alarms_reg(struct device *dev, struct device_attribute *attr, char *buf)
 {
@@ -546,10 +523,8 @@ show_alarms_reg(struct device *dev, stru
 	return sprintf(buf, "%u\n", data->alarms);
 }
 
-static
-DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);
-#define device_create_file_alarms(client) \
-device_create_file(&client->dev, &dev_attr_alarms);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);
+
 static ssize_t show_beep_mask (struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct w83781d_data *data = w83781d_update_device(dev);
@@ -615,12 +590,6 @@ static DEVICE_ATTR(beep_##reg, S_IRUGO |
 sysfs_beep(ENABLE, enable);
 sysfs_beep(MASK, mask);
 
-#define device_create_file_beep(client) \
-do { \
-device_create_file(&client->dev, &dev_attr_beep_enable); \
-device_create_file(&client->dev, &dev_attr_beep_mask); \
-} while (0)
-
 static ssize_t
 show_fan_div_reg(struct device *dev, char *buf, int nr)
 {
@@ -686,11 +655,6 @@ sysfs_fan_div(1);
 sysfs_fan_div(2);
 sysfs_fan_div(3);
 
-#define device_create_file_fan_div(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_fan##offset##_div); \
-} while (0)
-
 static ssize_t
 show_pwm_reg(struct device *dev, char *buf, int nr)
 {
@@ -787,16 +751,6 @@ sysfs_pwmenable(2);		/* only PWM2 can be
 sysfs_pwm(3);
 sysfs_pwm(4);
 
-#define device_create_file_pwm(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_pwm##offset); \
-} while (0)
-
-#define device_create_file_pwmenable(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_pwm##offset##_enable); \
-} while (0)
-
 static ssize_t
 show_sensor_reg(struct device *dev, char *buf, int nr)
 {
@@ -865,11 +819,6 @@ sysfs_sensor(1);
 sysfs_sensor(2);
 sysfs_sensor(3);
 
-#define device_create_file_sensor(client, offset) \
-do { \
-device_create_file(&client->dev, &dev_attr_temp##offset##_type); \
-} while (0)
-
 /* This function is called when:
      * w83781d_driver is inserted (when this module is loaded), for each
        available adapter
@@ -994,11 +943,69 @@ ERROR_SC_0:
 	return err;
 }
 
+#define IN_UNIT_ATTRS(X)			\
+	&dev_attr_in##X##_input.attr,		\
+	&dev_attr_in##X##_min.attr,		\
+	&dev_attr_in##X##_max.attr
+
+#define FAN_UNIT_ATTRS(X)			\
+	&dev_attr_fan##X##_input.attr,		\
+	&dev_attr_fan##X##_min.attr,		\
+	&dev_attr_fan##X##_div.attr
+
+#define TEMP_UNIT_ATTRS(X)			\
+	&dev_attr_temp##X##_input.attr,		\
+	&dev_attr_temp##X##_max.attr,		\
+	&dev_attr_temp##X##_max_hyst.attr
+
+static struct attribute* w83781d_attributes[] = {
+	IN_UNIT_ATTRS(0),
+	IN_UNIT_ATTRS(2),
+	IN_UNIT_ATTRS(3),
+	IN_UNIT_ATTRS(4),
+	IN_UNIT_ATTRS(5),
+	IN_UNIT_ATTRS(6),
+	FAN_UNIT_ATTRS(1),
+	FAN_UNIT_ATTRS(2),
+	FAN_UNIT_ATTRS(3),
+	TEMP_UNIT_ATTRS(1),
+	TEMP_UNIT_ATTRS(2),
+	&dev_attr_cpu0_vid.attr,
+	&dev_attr_vrm.attr,
+	&dev_attr_alarms.attr,
+	&dev_attr_beep_mask.attr,
+	&dev_attr_beep_enable.attr,
+	NULL
+};
+static const struct attribute_group w83781d_group = {
+	.attrs = w83781d_attributes,
+};
+
+static struct attribute *w83781d_attributes_opt[] = {
+	IN_UNIT_ATTRS(1),
+	IN_UNIT_ATTRS(7),
+	IN_UNIT_ATTRS(8),
+	TEMP_UNIT_ATTRS(3),
+	&dev_attr_pwm1.attr,
+	&dev_attr_pwm2.attr,
+	&dev_attr_pwm2_enable.attr,
+	&dev_attr_pwm3.attr,
+	&dev_attr_pwm4.attr,
+	&dev_attr_temp1_type.attr,
+	&dev_attr_temp2_type.attr,
+	&dev_attr_temp3_type.attr,
+	NULL
+};
+static const struct attribute_group w83781d_group_opt = {
+	.attrs = w83781d_attributes_opt,
+};
+
 static int
 w83781d_detect(struct i2c_adapter *adapter, int address, int kind)
 {
 	int i = 0, val1 = 0, val2;
-	struct i2c_client *new_client;
+	struct i2c_client *client;
+	struct device *dev;
 	struct w83781d_data *data;
 	int err;
 	const char *client_name = "";
@@ -1075,13 +1082,14 @@ #undef REALLY_SLOW_IO
 		goto ERROR1;
 	}
 
-	new_client = &data->client;
-	i2c_set_clientdata(new_client, data);
-	new_client->addr = address;
+	client = &data->client;
+	i2c_set_clientdata(client, data);
+	client->addr = address;
 	mutex_init(&data->lock);
-	new_client->adapter = adapter;
-	new_client->driver = is_isa ? &w83781d_isa_driver : &w83781d_driver;
-	new_client->flags = 0;
+	client->adapter = adapter;
+	client->driver = is_isa ? &w83781d_isa_driver : &w83781d_driver;
+	client->flags = 0;
+	dev = &client->dev;
 
 	/* Now, we do the remaining detection. */
 
@@ -1090,20 +1098,18 @@ #undef REALLY_SLOW_IO
 	   force_*=... parameter, and the Winbond will be reset to the right
 	   bank. */
 	if (kind < 0) {
-		if (w83781d_read_value(new_client, W83781D_REG_CONFIG) & 0x80) {
-			dev_dbg(&new_client->dev, "Detection failed at step "
-				"3\n");
+		if (w83781d_read_value(client, W83781D_REG_CONFIG) & 0x80) {
+			dev_dbg(dev, "Detection failed at step 3\n");
 			err = -ENODEV;
 			goto ERROR2;
 		}
-		val1 = w83781d_read_value(new_client, W83781D_REG_BANK);
-		val2 = w83781d_read_value(new_client, W83781D_REG_CHIPMAN);
+		val1 = w83781d_read_value(client, W83781D_REG_BANK);
+		val2 = w83781d_read_value(client, W83781D_REG_CHIPMAN);
 		/* Check for Winbond or Asus ID if in bank 0 */
 		if ((!(val1 & 0x07)) &&
 		    (((!(val1 & 0x80)) && (val2 != 0xa3) && (val2 != 0xc3))
 		     || ((val1 & 0x80) && (val2 != 0x5c) && (val2 != 0x12)))) {
-			dev_dbg(&new_client->dev, "Detection failed at step "
-				"4\n");
+			dev_dbg(dev, "Detection failed at step 4\n");
 			err = -ENODEV;
 			goto ERROR2;
 		}
@@ -1112,9 +1118,8 @@ #undef REALLY_SLOW_IO
 		if ((!is_isa) && (((!(val1 & 0x80)) && (val2 = 0xa3)) ||
 				  ((val1 & 0x80) && (val2 = 0x5c)))) {
 			if (w83781d_read_value
-			    (new_client, W83781D_REG_I2C_ADDR) != address) {
-				dev_dbg(&new_client->dev, "Detection failed "
-					"at step 5\n");
+			    (client, W83781D_REG_I2C_ADDR) != address) {
+				dev_dbg(dev, "Detection failed at step 5\n");
 				err = -ENODEV;
 				goto ERROR2;
 			}
@@ -1123,27 +1128,26 @@ #undef REALLY_SLOW_IO
 
 	/* We have either had a force parameter, or we have already detected the
 	   Winbond. Put it now into bank 0 and Vendor ID High Byte */
-	w83781d_write_value(new_client, W83781D_REG_BANK,
-			    (w83781d_read_value(new_client,
-						W83781D_REG_BANK) & 0x78) |
-			    0x80);
+	w83781d_write_value(client, W83781D_REG_BANK,
+			    (w83781d_read_value(client, W83781D_REG_BANK)
+			     & 0x78) | 0x80);
 
 	/* Determine the chip type. */
 	if (kind <= 0) {
 		/* get vendor ID */
-		val2 = w83781d_read_value(new_client, W83781D_REG_CHIPMAN);
+		val2 = w83781d_read_value(client, W83781D_REG_CHIPMAN);
 		if (val2 = 0x5c)
 			vendid = winbond;
 		else if (val2 = 0x12)
 			vendid = asus;
 		else {
-			dev_dbg(&new_client->dev, "Chip was made by neither "
+			dev_dbg(dev, "Chip was made by neither "
 				"Winbond nor Asus?\n");
 			err = -ENODEV;
 			goto ERROR2;
 		}
 
-		val1 = w83781d_read_value(new_client, W83781D_REG_WCHIPID);
+		val1 = w83781d_read_value(client, W83781D_REG_WCHIPID);
 		if ((val1 = 0x10 || val1 = 0x11) && vendid = winbond)
 			kind = w83781d;
 		else if (val1 = 0x30 && vendid = winbond)
@@ -1157,7 +1161,7 @@ #undef REALLY_SLOW_IO
 			kind = as99127f;
 		else {
 			if (kind = 0)
-				dev_warn(&new_client->dev, "Ignoring 'force' "
+				dev_warn(dev, "Ignoring 'force' "
 					 "parameter for unknown chip at "
 					 "adapter %d, address 0x%02x\n",
 					 i2c_adapter_id(adapter), address);
@@ -1179,20 +1183,20 @@ #undef REALLY_SLOW_IO
 	}
 
 	/* Fill in the remaining client fields and put into the global list */
-	strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
+	strlcpy(client->name, client_name, I2C_NAME_SIZE);
 	data->type = kind;
 
 	data->valid = 0;
 	mutex_init(&data->update_lock);
 
 	/* Tell the I2C layer a new client has arrived */
-	if ((err = i2c_attach_client(new_client)))
+	if ((err = i2c_attach_client(client)))
 		goto ERROR2;
 
 	/* attach secondary i2c lm75-like clients */
 	if (!is_isa) {
 		if ((err = w83781d_detect_subclients(adapter, address,
-				kind, new_client)))
+				kind, client)))
 			goto ERROR3;
 	} else {
 		data->lm75[0] = NULL;
@@ -1200,11 +1204,11 @@ #undef REALLY_SLOW_IO
 	}
 
 	/* Initialize the chip */
-	w83781d_init_client(new_client);
+	w83781d_init_client(client);
 
 	/* A few vars need to be filled upon startup */
 	for (i = 1; i <= 3; i++) {
-		data->fan_min[i - 1] = w83781d_read_value(new_client,
+		data->fan_min[i - 1] = w83781d_read_value(client,
 					W83781D_REG_FAN_MIN(i));
 	}
 	if (kind != w83781d && kind != as99127f)
@@ -1212,65 +1216,68 @@ #undef REALLY_SLOW_IO
 			data->pwmenable[i] = 1;
 
 	/* Register sysfs hooks */
-	data->class_dev = hwmon_device_register(&new_client->dev);
-	if (IS_ERR(data->class_dev)) {
-		err = PTR_ERR(data->class_dev);
+	if ((err = sysfs_create_group(&dev->kobj, &w83781d_group)))
 		goto ERROR4;
-	}
 
-	device_create_file_in(new_client, 0);
-	if (kind != w83783s)
-		device_create_file_in(new_client, 1);
-	device_create_file_in(new_client, 2);
-	device_create_file_in(new_client, 3);
-	device_create_file_in(new_client, 4);
-	device_create_file_in(new_client, 5);
-	device_create_file_in(new_client, 6);
+	if (kind != w83783s) {
+		if ((err = device_create_file(dev, &dev_attr_in1_input))
+		    || (err = device_create_file(dev, &dev_attr_in1_min))
+		    || (err = device_create_file(dev, &dev_attr_in1_max)))
+			goto ERROR4;
+	}
 	if (kind != as99127f && kind != w83781d && kind != w83783s) {
-		device_create_file_in(new_client, 7);
-		device_create_file_in(new_client, 8);
+		if ((err = device_create_file(dev, &dev_attr_in7_input))
+		    || (err = device_create_file(dev, &dev_attr_in7_min))
+		    || (err = device_create_file(dev, &dev_attr_in7_max))
+		    || (err = device_create_file(dev, &dev_attr_in8_input))
+		    || (err = device_create_file(dev, &dev_attr_in8_min))
+		    || (err = device_create_file(dev, &dev_attr_in8_max)))
+			goto ERROR4;
+	}
+	if (kind != w83783s) {
+		if ((err = device_create_file(dev, &dev_attr_temp3_input))
+		    || (err = device_create_file(dev, &dev_attr_temp3_max))
+		    || (err = device_create_file(dev,
+						 &dev_attr_temp3_max_hyst)))
+			goto ERROR4;
 	}
-
-	device_create_file_fan(new_client, 1);
-	device_create_file_fan(new_client, 2);
-	device_create_file_fan(new_client, 3);
-
-	device_create_file_temp(new_client, 1);
-	device_create_file_temp(new_client, 2);
-	if (kind != w83783s)
-		device_create_file_temp(new_client, 3);
-
-	device_create_file_vid(new_client);
-	device_create_file_vrm(new_client);
-
-	device_create_file_fan_div(new_client, 1);
-	device_create_file_fan_div(new_client, 2);
-	device_create_file_fan_div(new_client, 3);
-
-	device_create_file_alarms(new_client);
-
-	device_create_file_beep(new_client);
 
 	if (kind != w83781d && kind != as99127f) {
-		device_create_file_pwm(new_client, 1);
-		device_create_file_pwm(new_client, 2);
-		device_create_file_pwmenable(new_client, 2);
+		if ((err = device_create_file(dev, &dev_attr_pwm1))
+		    || (err = device_create_file(dev, &dev_attr_pwm2))
+		    || (err = device_create_file(dev, &dev_attr_pwm2_enable)))
+			goto ERROR4;
 	}
 	if (kind = w83782d && !is_isa) {
-		device_create_file_pwm(new_client, 3);
-		device_create_file_pwm(new_client, 4);
+		if ((err = device_create_file(dev, &dev_attr_pwm3))
+		    || (err = device_create_file(dev, &dev_attr_pwm4)))
+			goto ERROR4;
 	}
 
 	if (kind != as99127f && kind != w83781d) {
-		device_create_file_sensor(new_client, 1);
-		device_create_file_sensor(new_client, 2);
-		if (kind != w83783s)
-			device_create_file_sensor(new_client, 3);
+		if ((err = device_create_file(dev, &dev_attr_temp1_type))
+		    || (err = device_create_file(dev,
+						 &dev_attr_temp2_type)))
+			goto ERROR4;
+		if (kind != w83783s) {
+			if ((err = device_create_file(dev,
+						      &dev_attr_temp3_type)))
+				goto ERROR4;
+		}
+	}
+
+	data->class_dev = hwmon_device_register(dev);
+	if (IS_ERR(data->class_dev)) {
+		err = PTR_ERR(data->class_dev);
+		goto ERROR4;
 	}
 
 	return 0;
 
 ERROR4:
+	sysfs_remove_group(&dev->kobj, &w83781d_group);
+	sysfs_remove_group(&dev->kobj, &w83781d_group_opt);
+
 	if (data->lm75[1]) {
 		i2c_detach_client(data->lm75[1]);
 		kfree(data->lm75[1]);
@@ -1280,7 +1287,7 @@ ERROR4:
 		kfree(data->lm75[0]);
 	}
 ERROR3:
-	i2c_detach_client(new_client);
+	i2c_detach_client(client);
 ERROR2:
 	kfree(data);
 ERROR1:
@@ -1297,9 +1304,11 @@ w83781d_detach_client(struct i2c_client 
 	int err;
 
 	/* main client */
-	if (data)
+	if (data) {
 		hwmon_device_unregister(data->class_dev);
-
+		sysfs_remove_group(&client->dev.kobj, &w83781d_group);
+		sysfs_remove_group(&client->dev.kobj, &w83781d_group_opt);
+	}
 	if (i2c_is_isa_client(client))
 		release_region(client->addr, W83781D_EXTENT);
 
-- 
1.4.2.1