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[PATCH] abituguru: Review fixes
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Fixes to the Abit uGuru driver as requested in review by Jean Delvare:
 - exactly calculate the sysfs_names array length using macro
 - use snprintf when generating names to double check that the sysfs_names
   array does not overflow.
 - use ARRAY_SIZE and / or defines to determine number of loops in for loops
   instead of using hardcoded values.
 - In abituguru_probe(), refactor the error path leaving a single call to kfree

Signed-off-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Hans de Goede authored and Greg Kroah-Hartman committed Jun 22, 2006
1 parent f2b84bb commit a2392e0
Showing 1 changed file with 111 additions and 86 deletions.
197 changes: 111 additions & 86 deletions drivers/hwmon/abituguru.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,10 @@
#define ABIT_UGURU_SENSOR_BANK1 0x21 /* 16x volt and temp */
#define ABIT_UGURU_FAN_PWM 0x24 /* 3x 5 bytes */
#define ABIT_UGURU_SENSOR_BANK2 0x26 /* fans */
/* max nr of sensors in bank1, a bank1 sensor can be in, temp or nc */
#define ABIT_UGURU_MAX_BANK1_SENSORS 16
/* Warning if you increase one of the 2 MAX defines below to 10 or higher you
should adjust the belonging _NAMES_LENGTH macro for the 2 digit number! */
/* max nr of sensors in bank2, currently mb's with max 6 fans are known */
#define ABIT_UGURU_MAX_BANK2_SENSORS 6
/* max nr of pwm outputs, currently mb's with max 5 pwm outputs are known */
Expand Down Expand Up @@ -74,10 +78,33 @@
/* Maximum 3 retries on timedout reads/writes, delay 200 ms before retrying */
#define ABIT_UGURU_MAX_RETRIES 3
#define ABIT_UGURU_RETRY_DELAY (HZ/5)
/* Maximum 2 timeouts in abituguru_update_device, iow 3 in a row is a error */
/* Maximum 2 timeouts in abituguru_update_device, iow 3 in a row is an error */
#define ABIT_UGURU_MAX_TIMEOUTS 2

/* All the variables below are named identical to the oguru and oguru2 programs
/* utility macros */
#define ABIT_UGURU_NAME "abituguru"
#define ABIT_UGURU_DEBUG(level, format, arg...) \
if (level <= verbose) \
printk(KERN_DEBUG ABIT_UGURU_NAME ": " format , ## arg)
/* Macros to help calculate the sysfs_names array length */
/* sum of strlen of: in??_input\0, in??_{min,max}\0, in??_{min,max}_alarm\0,
in??_{min,max}_alarm_enable\0, in??_beep\0, in??_shutdown\0 */
#define ABITUGURU_IN_NAMES_LENGTH (11 + 2 * 9 + 2 * 15 + 2 * 22 + 10 + 14)
/* sum of strlen of: temp??_input\0, temp??_max\0, temp??_crit\0,
temp??_alarm\0, temp??_alarm_enable\0, temp??_beep\0, temp??_shutdown\0 */
#define ABITUGURU_TEMP_NAMES_LENGTH (13 + 11 + 12 + 13 + 20 + 12 + 16)
/* sum of strlen of: fan?_input\0, fan?_min\0, fan?_alarm\0,
fan?_alarm_enable\0, fan?_beep\0, fan?_shutdown\0 */
#define ABITUGURU_FAN_NAMES_LENGTH (11 + 9 + 11 + 18 + 10 + 14)
/* sum of strlen of: pwm?_enable\0, pwm?_auto_channels_temp\0,
pwm?_auto_point{1,2}_pwm\0, pwm?_auto_point{1,2}_temp\0 */
#define ABITUGURU_PWM_NAMES_LENGTH (12 + 24 + 2 * 21 + 2 * 22)
/* IN_NAMES_LENGTH > TEMP_NAMES_LENGTH so assume all bank1 sensors are in */
#define ABITUGURU_SYSFS_NAMES_LENGTH ( \
ABIT_UGURU_MAX_BANK1_SENSORS * ABITUGURU_IN_NAMES_LENGTH + \
ABIT_UGURU_MAX_BANK2_SENSORS * ABITUGURU_FAN_NAMES_LENGTH + \
ABIT_UGURU_MAX_PWMS * ABITUGURU_PWM_NAMES_LENGTH)

/* All the macros below are named identical to the oguru and oguru2 programs
reverse engineered by Olle Sandberg, hence the names might not be 100%
logical. I could come up with better names, but I prefer keeping the names
identical so that this driver can be compared with his work more easily. */
Expand All @@ -93,11 +120,6 @@
#define ABIT_UGURU_STATUS_READ 0x01 /* Ready to be read */
#define ABIT_UGURU_STATUS_INPUT 0x08 /* More input */
#define ABIT_UGURU_STATUS_READY 0x09 /* Ready to be written */
/* utility macros */
#define ABIT_UGURU_NAME "abituguru"
#define ABIT_UGURU_DEBUG(level, format, arg...) \
if (level <= verbose) \
printk(KERN_DEBUG ABIT_UGURU_NAME ": " format , ## arg)

/* Constants */
/* in (Volt) sensors go up to 3494 mV, temp to 255000 millidegrees Celsius */
Expand Down Expand Up @@ -156,24 +178,23 @@ struct abituguru_data {
of a sensor is a volt or a temp sensor, for bank2 and the pwms its
easier todo things the same way. For in sensors we have 9 (temp 7)
sysfs entries per sensor, for bank2 and pwms 6. */
struct sensor_device_attribute_2 sysfs_attr[16 * 9 +
struct sensor_device_attribute_2 sysfs_attr[
ABIT_UGURU_MAX_BANK1_SENSORS * 9 +
ABIT_UGURU_MAX_BANK2_SENSORS * 6 + ABIT_UGURU_MAX_PWMS * 6];
/* Buffer to store the dynamically generated sysfs names, we need 2120
bytes for bank1 (worst case scenario of 16 in sensors), 444 bytes
for fan1-6 and 738 bytes for pwm1-6 + some room to spare in case I
miscounted :) */
char bank1_names[3400];
/* Buffer to store the dynamically generated sysfs names */
char sysfs_names[ABITUGURU_SYSFS_NAMES_LENGTH];

/* Bank 1 data */
u8 bank1_sensors[2]; /* number of [0] in, [1] temp sensors */
u8 bank1_address[2][16];/* addresses of [0] in, [1] temp sensors */
u8 bank1_value[16];
/* This array holds 16 x 3 entries for all the bank 1 sensor settings
/* number of and addresses of [0] in, [1] temp sensors */
u8 bank1_sensors[2];
u8 bank1_address[2][ABIT_UGURU_MAX_BANK1_SENSORS];
u8 bank1_value[ABIT_UGURU_MAX_BANK1_SENSORS];
/* This array holds 3 entries per sensor for the bank 1 sensor settings
(flags, min, max for voltage / flags, warn, shutdown for temp). */
u8 bank1_settings[16][3];
u8 bank1_settings[ABIT_UGURU_MAX_BANK1_SENSORS][3];
/* Maximum value for each sensor used for scaling in mV/millidegrees
Celsius. */
int bank1_max_value[16];
int bank1_max_value[ABIT_UGURU_MAX_BANK1_SENSORS];

/* Bank 2 data, ABIT_UGURU_MAX_BANK2_SENSORS entries for bank2 */
u8 bank2_sensors; /* actual number of bank2 sensors found */
Expand Down Expand Up @@ -379,7 +400,7 @@ abituguru_detect_bank1_sensor_type(struct abituguru_data *data,
/* First read the sensor and the current settings */
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1, sensor_addr, &val,
1, ABIT_UGURU_MAX_RETRIES) != 1)
return -EIO;
return -ENODEV;

/* Test val is sane / usable for sensor type detection. */
if ((val < 10u) || (val > 240u)) {
Expand All @@ -401,27 +422,27 @@ abituguru_detect_bank1_sensor_type(struct abituguru_data *data,
buf[2] = 250;
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,
buf, 3) != 3)
return -EIO;
return -ENODEV;
/* Now we need 20 ms to give the uguru time to read the sensors
and raise a voltage alarm */
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/50);
/* Check for alarm and check the alarm is a volt low alarm. */
if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
return -EIO;
return -ENODEV;
if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,
sensor_addr, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
return -EIO;
return -ENODEV;
if (buf[0] & ABIT_UGURU_VOLT_LOW_ALARM_FLAG) {
/* Restore original settings */
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2,
sensor_addr,
data->bank1_settings[sensor_addr],
3) != 3)
return -EIO;
return -ENODEV;
ABIT_UGURU_DEBUG(2, " found volt sensor\n");
return ABIT_UGURU_IN_SENSOR;
} else
Expand All @@ -439,20 +460,20 @@ abituguru_detect_bank1_sensor_type(struct abituguru_data *data,
buf[2] = 10;
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,
buf, 3) != 3)
return -EIO;
return -ENODEV;
/* Now we need 50 ms to give the uguru time to read the sensors
and raise a temp alarm */
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(HZ/20);
/* Check for alarm and check the alarm is a temp high alarm. */
if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
return -EIO;
return -ENODEV;
if (buf[sensor_addr/8] & (0x01 << (sensor_addr % 8))) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1 + 1,
sensor_addr, buf, 3,
ABIT_UGURU_MAX_RETRIES) != 3)
return -EIO;
return -ENODEV;
if (buf[0] & ABIT_UGURU_TEMP_HIGH_ALARM_FLAG) {
ret = ABIT_UGURU_TEMP_SENSOR;
ABIT_UGURU_DEBUG(2, " found temp sensor\n");
Expand All @@ -466,7 +487,7 @@ abituguru_detect_bank1_sensor_type(struct abituguru_data *data,
/* Restore original settings */
if (abituguru_write(data, ABIT_UGURU_SENSOR_BANK1 + 2, sensor_addr,
data->bank1_settings[sensor_addr], 3) != 3)
return -EIO;
return -ENODEV;

return ret;
}
Expand Down Expand Up @@ -1061,21 +1082,21 @@ static const struct sensor_device_attribute_2 abituguru_sysfs_pwm_templ[6] = {
store_pwm_setting, 4, 0),
};

static const struct sensor_device_attribute_2 abituguru_sysfs_attr[] = {
static struct sensor_device_attribute_2 abituguru_sysfs_attr[] = {
SENSOR_ATTR_2(name, 0444, show_name, NULL, 0, 0),
};

static int __devinit abituguru_probe(struct platform_device *pdev)
{
struct abituguru_data *data;
int i, j, res;
int i, j, used, sysfs_names_free, sysfs_attr_i, res = -ENODEV;
char *sysfs_filename;
int sysfs_attr_i = 0;

/* El weirdo probe order, to keep the sysfs order identical to the
BIOS and window-appliction listing order. */
const u8 probe_order[16] = { 0x00, 0x01, 0x03, 0x04, 0x0A, 0x08, 0x0E,
0x02, 0x09, 0x06, 0x05, 0x0B, 0x0F, 0x0D, 0x07, 0x0C };
const u8 probe_order[ABIT_UGURU_MAX_BANK1_SENSORS] = {
0x00, 0x01, 0x03, 0x04, 0x0A, 0x08, 0x0E, 0x02,
0x09, 0x06, 0x05, 0x0B, 0x0F, 0x0D, 0x07, 0x0C };

if (!(data = kzalloc(sizeof(struct abituguru_data), GFP_KERNEL)))
return -ENOMEM;
Expand All @@ -1092,24 +1113,18 @@ static int __devinit abituguru_probe(struct platform_device *pdev)
- testread / see if one really is there.
- make an in memory copy of all the uguru settings for future use. */
if (abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0,
data->alarms, 3, ABIT_UGURU_MAX_RETRIES) != 3) {
kfree(data);
return -ENODEV;
}
data->alarms, 3, ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_probe_error;

for (i = 0; i < 16; i++) {
for (i = 0; i < ABIT_UGURU_MAX_BANK1_SENSORS; i++) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1, i,
&data->bank1_value[i], 1,
ABIT_UGURU_MAX_RETRIES) != 1) {
kfree(data);
return -ENODEV;
}
ABIT_UGURU_MAX_RETRIES) != 1)
goto abituguru_probe_error;
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK1+1, i,
data->bank1_settings[i], 3,
ABIT_UGURU_MAX_RETRIES) != 3) {
kfree(data);
return -ENODEV;
}
ABIT_UGURU_MAX_RETRIES) != 3)
goto abituguru_probe_error;
}
/* Note: We don't know how many bank2 sensors / pwms there really are,
but in order to "detect" this we need to read the maximum amount
Expand All @@ -1119,48 +1134,45 @@ static int __devinit abituguru_probe(struct platform_device *pdev)
for (i = 0; i < ABIT_UGURU_MAX_BANK2_SENSORS; i++) {
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK2, i,
&data->bank2_value[i], 1,
ABIT_UGURU_MAX_RETRIES) != 1) {
kfree(data);
return -ENODEV;
}
ABIT_UGURU_MAX_RETRIES) != 1)
goto abituguru_probe_error;
if (abituguru_read(data, ABIT_UGURU_SENSOR_BANK2+1, i,
data->bank2_settings[i], 2,
ABIT_UGURU_MAX_RETRIES) != 2) {
kfree(data);
return -ENODEV;
}
ABIT_UGURU_MAX_RETRIES) != 2)
goto abituguru_probe_error;
}
for (i = 0; i < ABIT_UGURU_MAX_PWMS; i++) {
if (abituguru_read(data, ABIT_UGURU_FAN_PWM, i,
data->pwm_settings[i], 5,
ABIT_UGURU_MAX_RETRIES) != 5) {
kfree(data);
return -ENODEV;
}
ABIT_UGURU_MAX_RETRIES) != 5)
goto abituguru_probe_error;
}
data->last_updated = jiffies;

/* Detect sensor types and fill the sysfs attr for bank1 */
sysfs_filename = data->bank1_names;
for (i = 0; i < 16; i++) {
sysfs_attr_i = 0;
sysfs_filename = data->sysfs_names;
sysfs_names_free = ABITUGURU_SYSFS_NAMES_LENGTH;
for (i = 0; i < ABIT_UGURU_MAX_BANK1_SENSORS; i++) {
res = abituguru_detect_bank1_sensor_type(data, probe_order[i]);
if (res < 0) {
kfree(data);
return -ENODEV;
}
if (res < 0)
goto abituguru_probe_error;
if (res == ABIT_UGURU_NC)
continue;

/* res 1 (temp) sensors have 7 sysfs entries, 0 (in) 9 */
for (j = 0; j < (res ? 7 : 9); j++) {
const char *name_templ = abituguru_sysfs_bank1_templ[
res][j].dev_attr.attr.name;
used = snprintf(sysfs_filename, sysfs_names_free,
abituguru_sysfs_bank1_templ[res][j].dev_attr.
attr.name, data->bank1_sensors[res] + res)
+ 1;
data->sysfs_attr[sysfs_attr_i] =
abituguru_sysfs_bank1_templ[res][j];
data->sysfs_attr[sysfs_attr_i].dev_attr.attr.name =
sysfs_filename;
sysfs_filename += sprintf(sysfs_filename, name_templ,
data->bank1_sensors[res] + res) + 1;
data->sysfs_attr[sysfs_attr_i].index = probe_order[i];
sysfs_filename += used;
sysfs_names_free -= used;
sysfs_attr_i++;
}
data->bank1_max_value[probe_order[i]] =
Expand All @@ -1172,52 +1184,65 @@ static int __devinit abituguru_probe(struct platform_device *pdev)
/* Detect number of sensors and fill the sysfs attr for bank2 (fans) */
abituguru_detect_no_bank2_sensors(data);
for (i = 0; i < data->bank2_sensors; i++) {
for (j = 0; j < 6; j++) {
const char *name_templ = abituguru_sysfs_fan_templ[j].
dev_attr.attr.name;
for (j = 0; j < ARRAY_SIZE(abituguru_sysfs_fan_templ); j++) {
used = snprintf(sysfs_filename, sysfs_names_free,
abituguru_sysfs_fan_templ[j].dev_attr.attr.name,
i + 1) + 1;
data->sysfs_attr[sysfs_attr_i] =
abituguru_sysfs_fan_templ[j];
data->sysfs_attr[sysfs_attr_i].dev_attr.attr.name =
sysfs_filename;
sysfs_filename += sprintf(sysfs_filename, name_templ,
i + 1) + 1;
data->sysfs_attr[sysfs_attr_i].index = i;
sysfs_filename += used;
sysfs_names_free -= used;
sysfs_attr_i++;
}
}
/* Detect number of sensors and fill the sysfs attr for pwms */
abituguru_detect_no_pwms(data);
for (i = 0; i < data->pwms; i++) {
for (j = 0; j < 6; j++) {
const char *name_templ = abituguru_sysfs_pwm_templ[j].
dev_attr.attr.name;
for (j = 0; j < ARRAY_SIZE(abituguru_sysfs_pwm_templ); j++) {
used = snprintf(sysfs_filename, sysfs_names_free,
abituguru_sysfs_pwm_templ[j].dev_attr.attr.name,
i + 1) + 1;
data->sysfs_attr[sysfs_attr_i] =
abituguru_sysfs_pwm_templ[j];
data->sysfs_attr[sysfs_attr_i].dev_attr.attr.name =
sysfs_filename;
sysfs_filename += sprintf(sysfs_filename, name_templ,
i + 1) + 1;
data->sysfs_attr[sysfs_attr_i].index = i;
sysfs_filename += used;
sysfs_names_free -= used;
sysfs_attr_i++;
}
}
/* Last add any "generic" entries to sysfs */
for (i = 0; i < ARRAY_SIZE(abituguru_sysfs_attr); i++) {
data->sysfs_attr[sysfs_attr_i] = abituguru_sysfs_attr[i];
sysfs_attr_i++;
/* Fail safe check, this should never happen! */
if (sysfs_names_free < 0) {
printk(KERN_ERR ABIT_UGURU_NAME ": Fatal error ran out of "
"space for sysfs attr names. This should never "
"happen please report to the abituguru maintainer "
"(see MAINTAINERS)\n");
res = -ENAMETOOLONG;
goto abituguru_probe_error;
}
printk(KERN_INFO ABIT_UGURU_NAME ": found Abit uGuru\n");

/* Register sysfs hooks */
data->class_dev = hwmon_device_register(&pdev->dev);
if (IS_ERR(data->class_dev)) {
kfree(data);
return PTR_ERR(data->class_dev);
res = PTR_ERR(data->class_dev);
goto abituguru_probe_error;
}
for (i = 0; i < sysfs_attr_i; i++)
device_create_file(&pdev->dev, &data->sysfs_attr[i].dev_attr);
for (i = 0; i < ARRAY_SIZE(abituguru_sysfs_attr); i++)
device_create_file(&pdev->dev,
&abituguru_sysfs_attr[i].dev_attr);

return 0;

abituguru_probe_error:
kfree(data);
return res;
}

static int __devexit abituguru_remove(struct platform_device *pdev)
Expand All @@ -1244,7 +1269,7 @@ static struct abituguru_data *abituguru_update_device(struct device *dev)
if ((err = abituguru_read(data, ABIT_UGURU_ALARM_BANK, 0,
data->alarms, 3, 0)) != 3)
goto LEAVE_UPDATE;
for (i = 0; i < 16; i++) {
for (i = 0; i < ABIT_UGURU_MAX_BANK1_SENSORS; i++) {
if ((err = abituguru_read(data,
ABIT_UGURU_SENSOR_BANK1, i,
&data->bank1_value[i], 1, 0)) != 1)
Expand Down

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