Merge v7.1.5linux-rolling-stable

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 51 insertions, 105 deletions

diff --git a/drivers/thermal/thermal_hwmon.c b/drivers/thermal/thermal_hwmon.c
index b624892bc6d6..223ae1571655 100644
--- a/drivers/thermal/thermal_hwmon.c
+++ b/drivers/thermal/thermal_hwmon.c
@@ -19,27 +19,31 @@
 #include "thermal_hwmon.h"
 #include "thermal_core.h"
 
-/* hwmon sys I/F */
-/* thermal zone devices with the same type share one hwmon device */
-struct thermal_hwmon_device {
-	char type[THERMAL_NAME_LENGTH];
-	struct device *device;
-	int count;
-	struct list_head tz_list;
-	struct list_head node;
-};
+/*
+ * Needs to be large enough to hold a thermal zone type string followed by an
+ * underline character and a 32-bit integer in decimal representation.
+ */
+#define THERMAL_HWMON_NAME_LENGTH (THERMAL_NAME_LENGTH + 11)
 
 struct thermal_hwmon_attr {
 	struct device_attribute attr;
-	char name[16];
 };
 
 /* one temperature input for each thermal zone */
 struct thermal_hwmon_temp {
-	struct list_head hwmon_node;
 	struct thermal_zone_device *tz;
 	struct thermal_hwmon_attr temp_input;	/* hwmon sys attr */
 	struct thermal_hwmon_attr temp_crit;	/* hwmon sys attr */
+	bool temp_crit_present;
+};
+
+/* hwmon sys I/F */
+/* thermal zone devices with the same type share one hwmon device */
+struct thermal_hwmon_device {
+	char name[THERMAL_HWMON_NAME_LENGTH];
+	struct device *device;
+	struct list_head node;
+	struct thermal_hwmon_temp tz_temp;
 };
 
 static LIST_HEAD(thermal_hwmon_list);
@@ -87,45 +91,6 @@ temp_crit_show(struct device *dev, struct device_attribute *attr, char *buf)
 	return sysfs_emit(buf, "%d\n", temperature);
 }
 
-
-static struct thermal_hwmon_device *
-thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
-{
-	struct thermal_hwmon_device *hwmon;
-	char type[THERMAL_NAME_LENGTH];
-
-	mutex_lock(&thermal_hwmon_list_lock);
-	list_for_each_entry(hwmon, &thermal_hwmon_list, node) {
-		strscpy(type, tz->type);
-		strreplace(type, '-', '_');
-		if (!strcmp(hwmon->type, type)) {
-			mutex_unlock(&thermal_hwmon_list_lock);
-			return hwmon;
-		}
-	}
-	mutex_unlock(&thermal_hwmon_list_lock);
-
-	return NULL;
-}
-
-/* Find the temperature input matching a given thermal zone */
-static struct thermal_hwmon_temp *
-thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
-			  const struct thermal_zone_device *tz)
-{
-	struct thermal_hwmon_temp *temp;
-
-	mutex_lock(&thermal_hwmon_list_lock);
-	list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
-		if (temp->tz == tz) {
-			mutex_unlock(&thermal_hwmon_list_lock);
-			return temp;
-		}
-	mutex_unlock(&thermal_hwmon_list_lock);
-
-	return NULL;
-}
-
 static bool thermal_zone_crit_temp_valid(struct thermal_zone_device *tz)
 {
 	int temp;
@@ -136,54 +101,39 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 {
 	struct thermal_hwmon_device *hwmon;
 	struct thermal_hwmon_temp *temp;
-	int new_hwmon_device = 1;
 	int result;
 
-	hwmon = thermal_hwmon_lookup_by_type(tz);
-	if (hwmon) {
-		new_hwmon_device = 0;
-		goto register_sys_interface;
-	}
-
 	hwmon = kzalloc_obj(*hwmon);
 	if (!hwmon)
 		return -ENOMEM;
 
-	INIT_LIST_HEAD(&hwmon->tz_list);
-	strscpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
-	strreplace(hwmon->type, '-', '_');
+	/*
+	 * Append the thermal zone ID preceded by an underline character to the
+	 * type to disambiguate the sensors command output.
+	 */
+	scnprintf(hwmon->name, THERMAL_HWMON_NAME_LENGTH, "%s_%d", tz->type, tz->id);
+	strreplace(hwmon->name, '-', '_');
 	hwmon->device = hwmon_device_register_for_thermal(&tz->device,
-							  hwmon->type, hwmon);
+							  hwmon->name, hwmon);
 	if (IS_ERR(hwmon->device)) {
 		result = PTR_ERR(hwmon->device);
 		goto free_mem;
 	}
 
- register_sys_interface:
-	temp = kzalloc_obj(*temp);
-	if (!temp) {
-		result = -ENOMEM;
-		goto unregister_name;
-	}
+	temp = &hwmon->tz_temp;
 
 	temp->tz = tz;
-	hwmon->count++;
 
-	snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
-		 "temp%d_input", hwmon->count);
-	temp->temp_input.attr.attr.name = temp->temp_input.name;
+	temp->temp_input.attr.attr.name = "temp1_input";
 	temp->temp_input.attr.attr.mode = 0444;
 	temp->temp_input.attr.show = temp_input_show;
 	sysfs_attr_init(&temp->temp_input.attr.attr);
 	result = device_create_file(hwmon->device, &temp->temp_input.attr);
 	if (result)
-		goto free_temp_mem;
+		goto unregister_name;
 
 	if (thermal_zone_crit_temp_valid(tz)) {
-		snprintf(temp->temp_crit.name,
-				sizeof(temp->temp_crit.name),
-				"temp%d_crit", hwmon->count);
-		temp->temp_crit.attr.attr.name = temp->temp_crit.name;
+		temp->temp_crit.attr.attr.name = "temp1_crit";
 		temp->temp_crit.attr.attr.mode = 0444;
 		temp->temp_crit.attr.show = temp_crit_show;
 		sysfs_attr_init(&temp->temp_crit.attr.attr);
@@ -191,23 +141,21 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 					    &temp->temp_crit.attr);
 		if (result)
 			goto unregister_input;
+
+		temp->temp_crit_present = true;
 	}
 
+	/* The list is needed for hwmon lookup during removal. */
 	mutex_lock(&thermal_hwmon_list_lock);
-	if (new_hwmon_device)
-		list_add_tail(&hwmon->node, &thermal_hwmon_list);
-	list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
+	list_add_tail(&hwmon->node, &thermal_hwmon_list);
 	mutex_unlock(&thermal_hwmon_list_lock);
 
 	return 0;
 
  unregister_input:
 	device_remove_file(hwmon->device, &temp->temp_input.attr);
- free_temp_mem:
-	kfree(temp);
  unregister_name:
-	if (new_hwmon_device)
-		hwmon_device_unregister(hwmon->device);
+	hwmon_device_unregister(hwmon->device);
  free_mem:
 	kfree(hwmon);
 
@@ -215,39 +163,37 @@ int thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 }
 EXPORT_SYMBOL_GPL(thermal_add_hwmon_sysfs);
 
+static struct thermal_hwmon_device *
+thermal_hwmon_lookup(const struct thermal_zone_device *tz)
+{
+	struct thermal_hwmon_device *hwmon;
+
+	list_for_each_entry(hwmon, &thermal_hwmon_list, node) {
+		if (hwmon->tz_temp.tz == tz)
+			return hwmon;
+	}
+	return NULL;
+}
+
 void thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 {
 	struct thermal_hwmon_device *hwmon;
 	struct thermal_hwmon_temp *temp;
 
-	hwmon = thermal_hwmon_lookup_by_type(tz);
-	if (unlikely(!hwmon)) {
-		/* Should never happen... */
-		dev_dbg(&tz->device, "hwmon device lookup failed!\n");
-		return;
-	}
+	scoped_guard(mutex, &thermal_hwmon_list_lock) {
+		hwmon = thermal_hwmon_lookup(tz);
+		if (!hwmon)
+			return;
 
-	temp = thermal_hwmon_lookup_temp(hwmon, tz);
-	if (unlikely(!temp)) {
-		/* Should never happen... */
-		dev_dbg(&tz->device, "temperature input lookup failed!\n");
-		return;
+		list_del(&hwmon->node);
 	}
 
+	temp = &hwmon->tz_temp;
+
 	device_remove_file(hwmon->device, &temp->temp_input.attr);
-	if (thermal_zone_crit_temp_valid(tz))
+	if (temp->temp_crit_present)
 		device_remove_file(hwmon->device, &temp->temp_crit.attr);
 
-	mutex_lock(&thermal_hwmon_list_lock);
-	list_del(&temp->hwmon_node);
-	kfree(temp);
-	if (!list_empty(&hwmon->tz_list)) {
-		mutex_unlock(&thermal_hwmon_list_lock);
-		return;
-	}
-	list_del(&hwmon->node);
-	mutex_unlock(&thermal_hwmon_list_lock);
-
 	hwmon_device_unregister(hwmon->device);
 	kfree(hwmon);
 }