hwmon fixes for v7.2-rc2

- adm1275: Detect coefficient overflow, and prevent reading uninitialized
   stack
 
 - aspeed-g6-pwm-tach: Guard fan RPM calculation against divide-by-zero
 
 - asus_atk0110: Check package count before accessing element
 
 - ltc4283: fix malformed table docs build error
 
 - occ: Unregister sysfs devices outside occ lock to avoid lockdep warning
 
 - pmbus core: Fix passing events to regulator core, and honor vrm_version in
   pmbus_data2reg_vid()
 
 - w83627hf: Remove VID sysfs files on error and remove
 
 - w83793: remove vrm sysfs file on probe failure
 
 - Various: Add missing 'select REGMAP_I2C' to Kconfig
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Merge tag 'hwmon-for-v7.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - adm1275: Detect coefficient overflow, and prevent reading
   uninitialized stack

 - aspeed-g6-pwm-tach: Guard fan RPM calculation against divide-by-zero

 - asus_atk0110: Check package count before accessing element

 - ltc4283: fix malformed table docs build error

 - occ: Unregister sysfs devices outside occ lock to avoid lockdep
   warning

 - pmbus core: Fix passing events to regulator core, and honor
   vrm_version in pmbus_data2reg_vid()

 - w83627hf: Remove VID sysfs files on error and remove

 - w83793: remove vrm sysfs file on probe failure

 - Various: Add missing 'select REGMAP_I2C' to Kconfig

* tag 'hwmon-for-v7.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (aspeed-g6-pwm-tach) Guard fan RPM calculation against divide-by-zero
  hwmon: (pmbus) Fix passing events to regulator core
  hwmon: adm1275: Detect coefficient overflow
  hwmon: adm1275: Prevent reading uninitialized stack
  hwmon: (max6697) add missing 'select REGMAP_I2C' to Kconfig
  hwmon: (ltc2992) add missing 'select REGMAP_I2C' to Kconfig
  hwmon: (max1619) add missing 'select REGMAP' to Kconfig
  hwmon: (w83627hf) remove VID sysfs files on error and remove
  hwmon: (w83793) remove vrm sysfs file on probe failure
  hwmon: (asus_atk0110) Check package count before accessing element
  docs: hwmon: ltc4283: fix malformed table docs build error
  hwmon: (pmbus/core) honor vrm_version in pmbus_data2reg_vid()
  hwmon: (occ) unregister sysfs devices outside occ lock

Documentation/hwmon/ltc4283.rst

@@ -256,7 +256,7 @@ these logs can be cleared by writing in the proper reset_history attribute.
 ``/sys/kernel/debug/i2c/i2c-[X]/[X]-addr/``
 contains the following attributes:
 
-=======================		==========================================
+==============================  ==========================================================
 power1_failed_fault_log		Set to 1 by a power1 fault occurring.
 power1_good_input_fault_log	Set to 1 by a power1 good input fault occurring at PGIO3.
 in11_fet_short_fault_log	Set to 1 when a FET-short fault occurs.
@@ -264,4 +264,4 @@ in11_fet_bad_fault_log		Set to 1 when a FET-BAD fault occurs.
 in0_lcrit_fault_log		Set to 1 by a VIN undervoltage fault occurring.
 in0_crit_fault_log		Set to 1 by a VIN overvoltage fault occurring.
 curr1_crit_fault_log		Set to 1 by an overcurrent fault occurring.
-======================= 	==========================================
+==============================  ==========================================================

drivers/hwmon/Kconfig

@@ -1098,6 +1098,7 @@ config SENSORS_LTC2992
 	tristate "Linear Technology LTC2992"
 	depends on I2C
 	depends on GPIOLIB
+	select REGMAP_I2C
 	help
 	  If you say yes here you get support for Linear Technology LTC2992
 	  I2C System Monitor. The LTC2992 measures current, voltage, and
@@ -1248,6 +1249,7 @@ config SENSORS_MAX16065
 config SENSORS_MAX1619
 	tristate "Maxim MAX1619 sensor chip"
 	depends on I2C
+	select REGMAP
 	help
 	  If you say yes here you get support for MAX1619 sensor chip.
 
@@ -1366,6 +1368,7 @@ config SENSORS_MAX6650
 config SENSORS_MAX6697
 	tristate "Maxim MAX6697 and compatibles"
 	depends on I2C
+	select REGMAP_I2C
 	help
 	  If you say yes here you get support for MAX6581, MAX6602, MAX6622,
 	  MAX6636, MAX6689, MAX6693, MAX6694, MAX6697, MAX6698, and MAX6699

drivers/hwmon/aspeed-g6-pwm-tach.c

@@ -293,7 +293,10 @@ static int aspeed_tach_val_to_rpm(struct aspeed_pwm_tach_data *priv, u32 tach_va
 		priv->clk_rate, tach_val, tach_div);
 
 	rpm = (u64)priv->clk_rate * 60;
-	do_div(rpm, tach_div);
+	if (tach_div)
+		do_div(rpm, tach_div);
+	else
+		rpm = 0;
 
 	return (int)rpm;
 }

drivers/hwmon/asus_atk0110.c

@@ -1037,6 +1037,9 @@ static int atk_ec_present(struct atk_data *data)
 		if (obj->type != ACPI_TYPE_PACKAGE)
 			continue;
 
+		if (!obj->package.count)
+			continue;
+
 		id = &obj->package.elements[0];
 		if (id->type != ACPI_TYPE_INTEGER)
 			continue;

drivers/hwmon/occ/common.c

@@ -214,6 +214,11 @@ int occ_update_response(struct occ *occ)
 	if (rc)
 		return rc;
 
+	if (!occ->active) {
+		rc = -ENODEV;
+		goto unlock;
+	}
+
 	/* limit the maximum rate of polling the OCC */
 	if (time_after(jiffies, occ->next_update)) {
 		rc = occ_poll(occ);
@@ -222,6 +227,7 @@ int occ_update_response(struct occ *occ)
 		rc = occ->last_error;
 	}
 
+unlock:
 	mutex_unlock(&occ->lock);
 	return rc;
 }
@@ -1105,11 +1111,16 @@ static void occ_parse_poll_response(struct occ *occ)
 
 int occ_active(struct occ *occ, bool active)
 {
-	int rc = mutex_lock_interruptible(&occ->lock);
+	struct device *hwmon = NULL;
+	int rc = mutex_lock_interruptible(&occ->hwmon_lock);
 
 	if (rc)
 		return rc;
 
+	rc = mutex_lock_interruptible(&occ->lock);
+	if (rc)
+		goto unlock_hwmon;
+
 	if (active) {
 		if (occ->active) {
 			rc = -EALREADY;
@@ -1154,14 +1165,17 @@ int occ_active(struct occ *occ, bool active)
 			goto unlock;
 		}
 
-		if (occ->hwmon)
-			hwmon_device_unregister(occ->hwmon);
+		hwmon = occ->hwmon;
 		occ->active = false;
 		occ->hwmon = NULL;
 	}
 
 unlock:
 	mutex_unlock(&occ->lock);
+	if (hwmon)
+		hwmon_device_unregister(hwmon);
+unlock_hwmon:
+	mutex_unlock(&occ->hwmon_lock);
 	return rc;
 }
 
@@ -1170,6 +1184,7 @@ int occ_setup(struct occ *occ)
 	int rc;
 
 	mutex_init(&occ->lock);
+	mutex_init(&occ->hwmon_lock);
 	occ->groups[0] = &occ->group;
 
 	rc = occ_setup_sysfs(occ);
@@ -1190,15 +1205,22 @@ EXPORT_SYMBOL_GPL(occ_setup);
 
 void occ_shutdown(struct occ *occ)
 {
-	mutex_lock(&occ->lock);
+	struct device *hwmon;
 
 	occ_shutdown_sysfs(occ);
 
-	if (occ->hwmon)
-		hwmon_device_unregister(occ->hwmon);
+	mutex_lock(&occ->hwmon_lock);
+	mutex_lock(&occ->lock);
+
+	hwmon = occ->hwmon;
+	occ->active = false;
 	occ->hwmon = NULL;
 
 	mutex_unlock(&occ->lock);
+
+	if (hwmon)
+		hwmon_device_unregister(hwmon);
+	mutex_unlock(&occ->hwmon_lock);
 }
 EXPORT_SYMBOL_GPL(occ_shutdown);
 

drivers/hwmon/occ/common.h

@@ -101,6 +101,7 @@ struct occ {
 
 	unsigned long next_update;
 	struct mutex lock;		/* lock OCC access */
+	struct mutex hwmon_lock;		/* serialize hwmon registration/removal */
 
 	struct device *hwmon;
 	struct occ_attribute *attrs;

drivers/hwmon/pmbus/adm1275.c

@@ -512,7 +512,7 @@ static int adm1275_enable_vout_temp(struct adm1275_data *data,
 static int adm1275_probe(struct i2c_client *client)
 {
 	s32 (*config_read_fn)(const struct i2c_client *client, u8 reg);
-	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1] = {0};
 	int config, device_config;
 	int ret;
 	struct pmbus_driver_info *info;
@@ -839,15 +839,25 @@ static int adm1275_probe(struct i2c_client *client)
 		info->R[PSC_VOLTAGE_OUT] = coefficients[voindex].R;
 	}
 	if (cindex >= 0) {
+		u32 m;
+
 		/* Scale current with sense resistor value */
-		info->m[PSC_CURRENT_OUT] =
-			coefficients[cindex].m * shunt / 1000;
+		if (unlikely(check_mul_overflow(coefficients[cindex].m, shunt, &m))) {
+			dev_err(&client->dev, "Current coefficient overflow\n");
+			return -EOVERFLOW;
+		}
+		info->m[PSC_CURRENT_OUT] = m / 1000;
 		info->b[PSC_CURRENT_OUT] = coefficients[cindex].b;
 		info->R[PSC_CURRENT_OUT] = coefficients[cindex].R;
 	}
 	if (pindex >= 0) {
-		info->m[PSC_POWER] =
-			coefficients[pindex].m * shunt / 1000;
+		u32 m;
+
+		if (unlikely(check_mul_overflow(coefficients[pindex].m, shunt, &m))) {
+			dev_err(&client->dev, "Power coefficient overflow\n");
+			return -EOVERFLOW;
+		}
+		info->m[PSC_POWER] = m / 1000;
 		info->b[PSC_POWER] = coefficients[pindex].b;
 		info->R[PSC_POWER] = coefficients[pindex].R;
 	}

drivers/hwmon/pmbus/pmbus_core.c

@@ -1095,9 +1095,27 @@ static u16 pmbus_data2reg_direct(struct pmbus_data *data,
 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
 			      struct pmbus_sensor *sensor, s64 val)
 {
-	val = clamp_val(val, 500, 1600);
-
-	return 2 + DIV_ROUND_CLOSEST_ULL((1600LL - val) * 100LL, 625);
+	switch (data->info->vrm_version[sensor->page]) {
+	case vr12:
+		val = clamp_val(val, 250, 1520);
+		return 1 + DIV_ROUND_CLOSEST_ULL(val - 250, 5);
+	case vr13:
+		val = clamp_val(val, 500, 3040);
+		return 1 + DIV_ROUND_CLOSEST_ULL(val - 500, 10);
+	case imvp9:
+		val = clamp_val(val, 200, 2740);
+		return 1 + DIV_ROUND_CLOSEST_ULL(val - 200, 10);
+	case amd625mv:
+		val = clamp_val(val, 200, 1550);
+		return DIV_ROUND_CLOSEST_ULL((1550LL - val) * 100LL, 625);
+	case nvidia195mv:
+		val = clamp_val(val, 195, 1465);
+		return 1 + DIV_ROUND_CLOSEST_ULL(val - 195, 5);
+	case vr11:
+	default:
+		val = clamp_val(val, 500, 1600);
+		return 2 + DIV_ROUND_CLOSEST_ULL((1600LL - val) * 100LL, 625);
+	}
 }
 
 static u16 pmbus_data2reg(struct pmbus_data *data,
@@ -3329,18 +3347,23 @@ static void pmbus_regulator_notify_worker(struct work_struct *work)
 	int i, j;
 
 	for (i = 0; i < data->info->pages; i++) {
-		int event;
+		unsigned int event;
 
 		event = atomic_xchg(&data->regulator_events[i], 0);
 		if (!event)
 			continue;
 
 		for (j = 0; j < data->info->num_regulators; j++) {
-			if (i == rdev_get_id(data->rdevs[j])) {
+			if (i != rdev_get_id(data->rdevs[j]))
+				continue;
+			while (event) {
+				unsigned int _event = BIT(__ffs(event));
+
 				regulator_notifier_call_chain(data->rdevs[j],
-							      event, NULL);
-				break;
+							      _event, NULL);
+				event &= ~_event;
 			}
+			break;
 		}
 	}
 }

drivers/hwmon/w83627hf.c

@@ -1823,6 +1823,8 @@ static int w83627hf_probe(struct platform_device *pdev)
 	return 0;
 
  error:
+	device_remove_file(dev, &dev_attr_vrm);
+	device_remove_file(dev, &dev_attr_cpu0_vid);
 	sysfs_remove_group(&dev->kobj, &w83627hf_group);
 	sysfs_remove_group(&dev->kobj, &w83627hf_group_opt);
 	return err;
@@ -1834,6 +1836,8 @@ static void w83627hf_remove(struct platform_device *pdev)
 
 	hwmon_device_unregister(data->hwmon_dev);
 
+	device_remove_file(&pdev->dev, &dev_attr_vrm);
+	device_remove_file(&pdev->dev, &dev_attr_cpu0_vid);
 	sysfs_remove_group(&pdev->dev.kobj, &w83627hf_group);
 	sysfs_remove_group(&pdev->dev.kobj, &w83627hf_group_opt);
 }

drivers/hwmon/w83793.c

@@ -1917,6 +1917,7 @@ static int w83793_probe(struct i2c_client *client)
 
 	for (i = 0; i < ARRAY_SIZE(w83793_vid); i++)
 		device_remove_file(dev, &w83793_vid[i].dev_attr);
+	device_remove_file(dev, &dev_attr_vrm);
 
 	for (i = 0; i < ARRAY_SIZE(w83793_left_fan); i++)
 		device_remove_file(dev, &w83793_left_fan[i].dev_attr);