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w83627ehf: Fix unchecked return status
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w83627ehf: Fix unchecked return status

Fix: check return value from device_create_file()
Fix: call device_remove_file() on error and module unload
Fix: call hwmon_device_register() after device_create_file() to eliminate race

Signed-off-by: David Hubbard <david.c.hubbard@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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David Hubbard authored and Greg Kroah-Hartman committed Sep 28, 2006
1 parent f3722d5 commit c18beb5
Showing 1 changed file with 82 additions and 40 deletions.
122 changes: 82 additions & 40 deletions drivers/hwmon/w83627ehf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@
Copyright (C) 2005 Jean Delvare <khali@linux-fr.org>
Copyright (C) 2006 Yuan Mu <Ymu@Winbond.com.tw>,
Rudolf Marek <r.marek@sh.cvut.cz>
David Hubbard <david.c.hubbard@gmail.com>
Shamelessly ripped from the w83627hf driver
Copyright (C) 2003 Mark Studebaker
Expand Down Expand Up @@ -621,14 +622,6 @@ static struct sensor_device_attribute sda_in_max[] = {
SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
};

static void device_create_file_in(struct device *dev, int i)
{
device_create_file(dev, &sda_in_input[i].dev_attr);
device_create_file(dev, &sda_in_alarm[i].dev_attr);
device_create_file(dev, &sda_in_min[i].dev_attr);
device_create_file(dev, &sda_in_max[i].dev_attr);
}

#define show_fan_reg(reg) \
static ssize_t \
show_##reg(struct device *dev, struct device_attribute *attr, \
Expand Down Expand Up @@ -756,14 +749,6 @@ static struct sensor_device_attribute sda_fan_div[] = {
SENSOR_ATTR(fan5_div, S_IRUGO, show_fan_div, NULL, 4),
};

static void device_create_file_fan(struct device *dev, int i)
{
device_create_file(dev, &sda_fan_input[i].dev_attr);
device_create_file(dev, &sda_fan_alarm[i].dev_attr);
device_create_file(dev, &sda_fan_div[i].dev_attr);
device_create_file(dev, &sda_fan_min[i].dev_attr);
}

#define show_temp1_reg(reg) \
static ssize_t \
show_##reg(struct device *dev, struct device_attribute *attr, \
Expand Down Expand Up @@ -1036,15 +1021,6 @@ static struct sensor_device_attribute sda_tolerance[] = {
store_tolerance, 3),
};

static void device_create_file_pwm(struct device *dev, int i)
{
device_create_file(dev, &sda_pwm[i].dev_attr);
device_create_file(dev, &sda_pwm_mode[i].dev_attr);
device_create_file(dev, &sda_pwm_enable[i].dev_attr);
device_create_file(dev, &sda_target_temp[i].dev_attr);
device_create_file(dev, &sda_tolerance[i].dev_attr);
}

/* Smart Fan registers */

#define fan_functions(reg, REG) \
Expand Down Expand Up @@ -1131,6 +1107,39 @@ static struct sensor_device_attribute sda_sf3_arrays[] = {
* Driver and client management
*/

static void w83627ehf_device_remove_files(struct device *dev)
{
/* some entries in the following arrays may not have been used in
* device_create_file(), but device_remove_file() will ignore them */
int i;

for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays); i++)
device_remove_file(dev, &sda_sf3_arrays[i].dev_attr);
for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays_fan4); i++)
device_remove_file(dev, &sda_sf3_arrays_fan4[i].dev_attr);
for (i = 0; i < 10; i++) {
device_remove_file(dev, &sda_in_input[i].dev_attr);
device_remove_file(dev, &sda_in_alarm[i].dev_attr);
device_remove_file(dev, &sda_in_min[i].dev_attr);
device_remove_file(dev, &sda_in_max[i].dev_attr);
}
for (i = 0; i < 5; i++) {
device_remove_file(dev, &sda_fan_input[i].dev_attr);
device_remove_file(dev, &sda_fan_alarm[i].dev_attr);
device_remove_file(dev, &sda_fan_div[i].dev_attr);
device_remove_file(dev, &sda_fan_min[i].dev_attr);
}
for (i = 0; i < 4; i++) {
device_remove_file(dev, &sda_pwm[i].dev_attr);
device_remove_file(dev, &sda_pwm_mode[i].dev_attr);
device_remove_file(dev, &sda_pwm_enable[i].dev_attr);
device_remove_file(dev, &sda_target_temp[i].dev_attr);
device_remove_file(dev, &sda_tolerance[i].dev_attr);
}
for (i = 0; i < ARRAY_SIZE(sda_temp); i++)
device_remove_file(dev, &sda_temp[i].dev_attr);
}

static struct i2c_driver w83627ehf_driver;

static void w83627ehf_init_client(struct i2c_client *client)
Expand Down Expand Up @@ -1217,37 +1226,69 @@ static int w83627ehf_detect(struct i2c_adapter *adapter)
data->has_fan |= (1 << 4);

/* Register sysfs hooks */
data->class_dev = hwmon_device_register(dev);
if (IS_ERR(data->class_dev)) {
err = PTR_ERR(data->class_dev);
goto exit_detach;
}

for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays); i++)
device_create_file(dev, &sda_sf3_arrays[i].dev_attr);
if ((err = device_create_file(dev,
&sda_sf3_arrays[i].dev_attr)))
goto exit_remove;

/* if fan4 is enabled create the sf3 files for it */
if (data->has_fan & (1 << 3))
for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays_fan4); i++)
device_create_file(dev, &sda_sf3_arrays_fan4[i].dev_attr);
for (i = 0; i < ARRAY_SIZE(sda_sf3_arrays_fan4); i++) {
if ((err = device_create_file(dev,
&sda_sf3_arrays_fan4[i].dev_attr)))
goto exit_remove;
}

for (i = 0; i < 10; i++)
device_create_file_in(dev, i);
if ((err = device_create_file(dev, &sda_in_input[i].dev_attr))
|| (err = device_create_file(dev,
&sda_in_alarm[i].dev_attr))
|| (err = device_create_file(dev,
&sda_in_min[i].dev_attr))
|| (err = device_create_file(dev,
&sda_in_max[i].dev_attr)))
goto exit_remove;

for (i = 0; i < 5; i++) {
if (data->has_fan & (1 << i)) {
device_create_file_fan(dev, i);
if (i != 4) /* we have only 4 pwm */
device_create_file_pwm(dev, i);
if ((err = device_create_file(dev,
&sda_fan_input[i].dev_attr))
|| (err = device_create_file(dev,
&sda_fan_alarm[i].dev_attr))
|| (err = device_create_file(dev,
&sda_fan_div[i].dev_attr))
|| (err = device_create_file(dev,
&sda_fan_min[i].dev_attr)))
goto exit_remove;
if (i < 4 && /* w83627ehf only has 4 pwm */
((err = device_create_file(dev,
&sda_pwm[i].dev_attr))
|| (err = device_create_file(dev,
&sda_pwm_mode[i].dev_attr))
|| (err = device_create_file(dev,
&sda_pwm_enable[i].dev_attr))
|| (err = device_create_file(dev,
&sda_target_temp[i].dev_attr))
|| (err = device_create_file(dev,
&sda_tolerance[i].dev_attr))))
goto exit_remove;
}
}

for (i = 0; i < ARRAY_SIZE(sda_temp); i++)
device_create_file(dev, &sda_temp[i].dev_attr);
if ((err = device_create_file(dev, &sda_temp[i].dev_attr)))
goto exit_remove;

data->class_dev = hwmon_device_register(dev);
if (IS_ERR(data->class_dev)) {
err = PTR_ERR(data->class_dev);
goto exit_remove;
}

return 0;

exit_detach:
exit_remove:
w83627ehf_device_remove_files(dev);
i2c_detach_client(client);
exit_free:
kfree(data);
Expand All @@ -1263,6 +1304,7 @@ static int w83627ehf_detach_client(struct i2c_client *client)
int err;

hwmon_device_unregister(data->class_dev);
w83627ehf_device_remove_files(&client->dev);

if ((err = i2c_detach_client(client)))
return err;
Expand Down

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