From: Hans de Goede Date: Wed, 7 Jan 2009 15:37:28 +0000 (+0100) Subject: hwmon: (f71882fg) Fix various sysfs callback function issues X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ce0bfa5ee25ddbe4072b16054e809f552bf72320;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git hwmon: (f71882fg) Fix various sysfs callback function issues While working on adding F8000 support I noticed that various of the store sysfs functions (and a few of the show also) had issues. This patch fixes the following issues in these functions: * store: storing the result of strto[u]l in an int, resulting in a possible overflow before boundary checking * store: use of f71882fg_update_device(), we don't want to read the whole device in store functions, just the registers we need * store: use of cached register values instead of reading the needed regs in the store function, including cases where f71882fg_update_device() was not used, this could cause real isues * show: shown value is a calculation of 2 or more cached register reads, without locking the data struct. Signed-off-by: Hans de Goede Signed-off-by: Jean Delvare --- diff --git a/drivers/hwmon/f71882fg.c b/drivers/hwmon/f71882fg.c index 2604c6d7ea58..345f465aa288 100644 --- a/drivers/hwmon/f71882fg.c +++ b/drivers/hwmon/f71882fg.c @@ -835,6 +835,7 @@ static ssize_t store_fan_full_speed(struct device *dev, val = fan_to_reg(val); mutex_lock(&data->update_lock); + data->pwm_enable = f71882fg_read8(data, F71882FG_REG_PWM_ENABLE); if (data->pwm_enable & (1 << (2 * nr))) /* PWM mode */ count = -EINVAL; @@ -865,9 +866,10 @@ static ssize_t store_fan_beep(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10); + unsigned long val = simple_strtoul(buf, NULL, 10); mutex_lock(&data->update_lock); + data->fan_beep = f71882fg_read8(data, F71882FG_REG_FAN_BEEP); if (val) data->fan_beep |= 1 << nr; else @@ -912,10 +914,8 @@ static ssize_t store_in_max(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct f71882fg_data *data = dev_get_drvdata(dev); - int val = simple_strtoul(buf, NULL, 10) / 8; - - if (val > 255) - val = 255; + long val = simple_strtol(buf, NULL, 10) / 8; + val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); f71882fg_write8(data, F71882FG_REG_IN1_HIGH, val); @@ -942,9 +942,10 @@ static ssize_t store_in_beep(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10); + unsigned long val = simple_strtoul(buf, NULL, 10); mutex_lock(&data->update_lock); + data->in_beep = f71882fg_read8(data, F71882FG_REG_IN_BEEP); if (val) data->in_beep |= 1 << nr; else @@ -991,10 +992,8 @@ static ssize_t store_temp_max(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10) / 1000; - - if (val > 255) - val = 255; + long val = simple_strtol(buf, NULL, 10) / 1000; + val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); f71882fg_write8(data, F71882FG_REG_TEMP_HIGH(nr), val); @@ -1009,9 +1008,13 @@ static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute { struct f71882fg_data *data = f71882fg_update_device(dev); int nr = to_sensor_dev_attr_2(devattr)->index; + int temp_max_hyst; - return sprintf(buf, "%d\n", - (data->temp_high[nr] - data->temp_hyst[nr]) * 1000); + mutex_lock(&data->update_lock); + temp_max_hyst = (data->temp_high[nr] - data->temp_hyst[nr]) * 1000; + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%d\n", temp_max_hyst); } static ssize_t store_temp_max_hyst(struct device *dev, struct device_attribute @@ -1019,37 +1022,38 @@ static ssize_t store_temp_max_hyst(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10) / 1000; + long val = simple_strtol(buf, NULL, 10) / 1000; ssize_t ret = count; + u8 reg; mutex_lock(&data->update_lock); /* convert abs to relative and check */ + data->temp_high[nr] = f71882fg_read8(data, F71882FG_REG_TEMP_HIGH(nr)); + val = SENSORS_LIMIT(val, data->temp_high[nr] - 15, + data->temp_high[nr]); val = data->temp_high[nr] - val; - if (val < 0 || val > 15) { - ret = -EINVAL; - goto store_temp_max_hyst_exit; - } - data->temp_hyst[nr] = val; /* convert value to register contents */ switch (nr) { case 1: - val = val << 4; + reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST1); + reg = (reg & 0x0f) | (val << 4); break; case 2: - val = val | (data->temp_hyst[3] << 4); + reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST23); + reg = (reg & 0xf0) | val; break; case 3: - val = data->temp_hyst[2] | (val << 4); + reg = f71882fg_read8(data, F71882FG_REG_TEMP_HYST23); + reg = (reg & 0x0f) | (val << 4); break; } f71882fg_write8(data, (nr <= 1) ? F71882FG_REG_TEMP_HYST1 : - F71882FG_REG_TEMP_HYST23, val); + F71882FG_REG_TEMP_HYST23, reg); -store_temp_max_hyst_exit: mutex_unlock(&data->update_lock); return ret; } @@ -1068,10 +1072,8 @@ static ssize_t store_temp_crit(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10) / 1000; - - if (val > 255) - val = 255; + long val = simple_strtol(buf, NULL, 10) / 1000; + val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); f71882fg_write8(data, F71882FG_REG_TEMP_OVT(nr), val); @@ -1086,9 +1088,13 @@ static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute { struct f71882fg_data *data = f71882fg_update_device(dev); int nr = to_sensor_dev_attr_2(devattr)->index; + int temp_crit_hyst; - return sprintf(buf, "%d\n", - (data->temp_ovt[nr] - data->temp_hyst[nr]) * 1000); + mutex_lock(&data->update_lock); + temp_crit_hyst = (data->temp_ovt[nr] - data->temp_hyst[nr]) * 1000; + mutex_unlock(&data->update_lock); + + return sprintf(buf, "%d\n", temp_crit_hyst); } static ssize_t show_temp_type(struct device *dev, struct device_attribute @@ -1117,9 +1123,10 @@ static ssize_t store_temp_beep(struct device *dev, struct device_attribute { struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10); + unsigned long val = simple_strtoul(buf, NULL, 10); mutex_lock(&data->update_lock); + data->temp_beep = f71882fg_read8(data, F71882FG_REG_TEMP_BEEP); if (val) data->temp_beep |= 1 << nr; else @@ -1160,16 +1167,16 @@ static ssize_t show_pwm(struct device *dev, { struct f71882fg_data *data = f71882fg_update_device(dev); int val, nr = to_sensor_dev_attr_2(devattr)->index; + mutex_lock(&data->update_lock); if (data->pwm_enable & (1 << (2 * nr))) /* PWM mode */ val = data->pwm[nr]; else { /* RPM mode */ - mutex_lock(&data->update_lock); val = 255 * fan_from_reg(data->fan_target[nr]) / fan_from_reg(data->fan_full_speed[nr]); - mutex_unlock(&data->update_lock); } + mutex_unlock(&data->update_lock); return sprintf(buf, "%d\n", val); } @@ -1177,23 +1184,26 @@ static ssize_t store_pwm(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - /* struct f71882fg_data *data = dev_get_drvdata(dev); */ - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; long val = simple_strtol(buf, NULL, 10); val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); + data->pwm_enable = f71882fg_read8(data, F71882FG_REG_PWM_ENABLE); if (data->pwm_enable & (1 << (2 * nr))) { /* PWM mode */ f71882fg_write8(data, F71882FG_REG_PWM(nr), val); data->pwm[nr] = val; } else { /* RPM mode */ - int target = val * fan_from_reg(data->fan_full_speed[nr]) / 255; - f71882fg_write16(data, F71882FG_REG_FAN_TARGET(nr), - fan_to_reg(target)); - data->fan_target[nr] = fan_to_reg(target); + int target, full_speed; + full_speed = f71882fg_read16(data, + F71882FG_REG_FAN_FULL_SPEED(nr)); + target = fan_to_reg(val * fan_from_reg(full_speed) / 255); + f71882fg_write16(data, F71882FG_REG_FAN_TARGET(nr), target); + data->fan_target[nr] = target; + data->fan_full_speed[nr] = full_speed; } mutex_unlock(&data->update_lock); @@ -1225,6 +1235,7 @@ static ssize_t store_pwm_enable(struct device *dev, struct device_attribute return -EINVAL; mutex_lock(&data->update_lock); + data->pwm_enable = f71882fg_read8(data, F71882FG_REG_PWM_ENABLE); switch (val) { case 1: data->pwm_enable |= 2 << (2 * nr); @@ -1258,6 +1269,7 @@ static ssize_t show_pwm_auto_point_pwm(struct device *dev, int pwm = to_sensor_dev_attr_2(devattr)->index; int point = to_sensor_dev_attr_2(devattr)->nr; + mutex_lock(&data->update_lock); if (data->pwm_enable & (1 << (2 * pwm))) { /* PWM mode */ result = data->pwm_auto_point_pwm[pwm][point]; @@ -1265,6 +1277,7 @@ static ssize_t show_pwm_auto_point_pwm(struct device *dev, /* RPM mode */ result = 32 * 255 / (32 + data->pwm_auto_point_pwm[pwm][point]); } + mutex_unlock(&data->update_lock); return sprintf(buf, "%d\n", result); } @@ -1273,14 +1286,14 @@ static ssize_t store_pwm_auto_point_pwm(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - /* struct f71882fg_data *data = dev_get_drvdata(dev); */ - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int pwm = to_sensor_dev_attr_2(devattr)->index; int point = to_sensor_dev_attr_2(devattr)->nr; - int val = simple_strtoul(buf, NULL, 10); + long val = simple_strtol(buf, NULL, 10); val = SENSORS_LIMIT(val, 0, 255); mutex_lock(&data->update_lock); + data->pwm_enable = f71882fg_read8(data, F71882FG_REG_PWM_ENABLE); if (data->pwm_enable & (1 << (2 * pwm))) { /* PWM mode */ } else { @@ -1331,16 +1344,25 @@ static ssize_t store_pwm_auto_point_temp_hyst(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; int point = to_sensor_dev_attr_2(devattr)->nr; long val = simple_strtol(buf, NULL, 10) / 1000; mutex_lock(&data->update_lock); + data->pwm_auto_point_temp[nr][point] = + f71882fg_read8(data, F71882FG_REG_POINT_TEMP(nr, point)); val = SENSORS_LIMIT(val, data->pwm_auto_point_temp[nr][point] - 15, data->pwm_auto_point_temp[nr][point]); val = data->pwm_auto_point_temp[nr][point] - val; + if (nr == 0 || nr == 1) { + data->pwm_auto_point_hyst[0] = + f71882fg_read8(data, F71882FG_REG_FAN_HYST0); + } else { + data->pwm_auto_point_hyst[1] = + f71882fg_read8(data, F71882FG_REG_FAN_HYST1); + } switch (nr) { case 0: val = (data->pwm_auto_point_hyst[0] & 0xf0) | val; @@ -1383,11 +1405,13 @@ static ssize_t store_pwm_interpolate(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - /* struct f71882fg_data *data = dev_get_drvdata(dev); */ - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; - int val = simple_strtoul(buf, NULL, 10); + unsigned long val = simple_strtoul(buf, NULL, 10); + mutex_lock(&data->update_lock); + data->pwm_auto_point_mapping[nr] = + f71882fg_read8(data, F71882FG_REG_POINT_MAPPING(nr)); if (val) val = data->pwm_auto_point_mapping[nr] | (1 << 4); else @@ -1416,8 +1440,7 @@ static ssize_t store_pwm_auto_point_channel(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - /* struct f71882fg_data *data = dev_get_drvdata(dev); */ - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int nr = to_sensor_dev_attr_2(devattr)->index; long val = simple_strtol(buf, NULL, 10); switch (val) { @@ -1434,6 +1457,8 @@ static ssize_t store_pwm_auto_point_channel(struct device *dev, return -EINVAL; } mutex_lock(&data->update_lock); + data->pwm_auto_point_mapping[nr] = + f71882fg_read8(data, F71882FG_REG_POINT_MAPPING(nr)); val = (data->pwm_auto_point_mapping[nr] & 0xfc) | val; f71882fg_write8(data, F71882FG_REG_POINT_MAPPING(nr), val); data->pwm_auto_point_mapping[nr] = val; @@ -1459,8 +1484,7 @@ static ssize_t store_pwm_auto_point_temp(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { - /* struct f71882fg_data *data = dev_get_drvdata(dev); */ - struct f71882fg_data *data = f71882fg_update_device(dev); + struct f71882fg_data *data = dev_get_drvdata(dev); int pwm = to_sensor_dev_attr_2(devattr)->index; int point = to_sensor_dev_attr_2(devattr)->nr; long val = simple_strtol(buf, NULL, 10) / 1000;