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Date: Tue, 16 Oct 2012 19:44:45 +0800
From: "hongbo.zhang" <hongbo.zhang@...aro.org>
To: linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Cc: patches@...aro.org, linaro-kernel@...ts.linaro.org,
STEricsson_nomadik_linux@...t.st.com, kernel@...oocommunity.org,
"hongbo.zhang" <hongbo.zhang@...aro.com>
Subject: [PATCH 1/5] Thermal: do bind operation after thermal zone or cooling device register returns.
From: "hongbo.zhang" <hongbo.zhang@...aro.com>
In the previous bind function, cdev->get_max_state(cdev, &max_state) is called
before the registration function finishes, but at this moment, the parameter
cdev at thermal driver layer isn't ready--it will get ready only after its
registration, so the the get_max_state callback cannot tell the max_state
according to the cdev input.
This problem can be fixed by separating the bind operation out of registration
and doing it when registration completely finished.
Signed-off-by: hongbo.zhang <hongbo.zhang@...aro.com>
---
drivers/thermal/thermal_sys.c | 86 +++++++++++++++++++++++++++++--------------
1 file changed, 58 insertions(+), 28 deletions(-)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 9ee42ca..dd3d024 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -70,6 +70,8 @@ static LIST_HEAD(thermal_tz_list);
static LIST_HEAD(thermal_cdev_list);
static DEFINE_MUTEX(thermal_list_lock);
+static struct work_struct thermal_bind;
+
static int get_idr(struct idr *idr, struct mutex *lock, int *id)
{
int err;
@@ -777,7 +779,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
dev->lower = lower;
dev->target = THERMAL_NO_TARGET;
- result = get_idr(&tz->idr, &tz->lock, &dev->id);
+ result = get_idr(&tz->idr, NULL, &dev->id);
if (result)
goto free_mem;
@@ -796,7 +798,7 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
if (result)
goto remove_symbol_link;
- mutex_lock(&tz->lock);
+ /* tz->lock should have been locked outside this function */
mutex_lock(&cdev->lock);
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
@@ -808,7 +810,6 @@ int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
}
mutex_unlock(&cdev->lock);
- mutex_unlock(&tz->lock);
if (!result)
return 0;
@@ -895,7 +896,6 @@ thermal_cooling_device_register(char *type, void *devdata,
const struct thermal_cooling_device_ops *ops)
{
struct thermal_cooling_device *cdev;
- struct thermal_zone_device *pos;
int result;
if (type && strlen(type) >= THERMAL_NAME_LENGTH)
@@ -947,16 +947,10 @@ thermal_cooling_device_register(char *type, void *devdata,
mutex_lock(&thermal_list_lock);
list_add(&cdev->node, &thermal_cdev_list);
- list_for_each_entry(pos, &thermal_tz_list, node) {
- if (!pos->ops->bind)
- continue;
- result = pos->ops->bind(pos, cdev);
- if (result)
- break;
-
- }
mutex_unlock(&thermal_list_lock);
+ schedule_work(&thermal_bind);
+
if (!result)
return cdev;
@@ -1141,19 +1135,13 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz,
return;
}
-/**
- * thermal_zone_device_update - force an update of a thermal zone's state
- * @ttz: the thermal zone to update
- */
-void thermal_zone_device_update(struct thermal_zone_device *tz)
+void __thermal_zone_device_update(struct thermal_zone_device *tz)
{
int count, ret = 0;
long temp, trip_temp;
enum thermal_trip_type trip_type;
- mutex_lock(&tz->lock);
-
if (tz->ops->get_temp(tz, &temp)) {
/* get_temp failed - retry it later */
pr_warn("failed to read out thermal zone %d\n", tz->id);
@@ -1206,10 +1194,56 @@ leave:
thermal_zone_device_set_polling(tz, tz->polling_delay);
else
thermal_zone_device_set_polling(tz, 0);
+}
+
+/**
+ * thermal_zone_device_update - force an update of a thermal zone's state
+ * @tz: the thermal zone to update
+ */
+void thermal_zone_device_update(struct thermal_zone_device *tz)
+{
+ mutex_lock(&tz->lock);
+
+ __thermal_zone_device_update(tz);
+
mutex_unlock(&tz->lock);
}
EXPORT_SYMBOL(thermal_zone_device_update);
+static void thermal_zone_do_bind_work(struct work_struct *work)
+{
+ struct thermal_instance *instance;
+ struct thermal_zone_device *tz;
+ struct thermal_cooling_device *cdev;
+
+ mutex_lock(&thermal_list_lock);
+
+ list_for_each_entry(tz, &thermal_tz_list, node)
+ list_for_each_entry(cdev, &thermal_cdev_list, node) {
+
+ mutex_lock(&tz->lock);
+
+ if (list_empty(&tz->thermal_instances)
+ && tz->ops->bind) {
+ tz->ops->bind(tz, cdev);
+ __thermal_zone_device_update(tz);
+ mutex_unlock(&tz->lock);
+ break;
+ }
+
+ list_for_each_entry(instance, &tz->thermal_instances,
+ tz_node)
+ if (instance->cdev != cdev && tz->ops->bind) {
+ tz->ops->bind(tz, cdev);
+ __thermal_zone_device_update(tz);
+ }
+
+ mutex_unlock(&tz->lock);
+ }
+
+ mutex_unlock(&thermal_list_lock);
+}
+
/**
* create_trip_attrs - create attributes for trip points
* @tz: the thermal zone device
@@ -1335,7 +1369,6 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
int passive_delay, int polling_delay)
{
struct thermal_zone_device *tz;
- struct thermal_cooling_device *pos;
enum thermal_trip_type trip_type;
int result;
int count;
@@ -1419,17 +1452,12 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
mutex_lock(&thermal_list_lock);
list_add_tail(&tz->node, &thermal_tz_list);
- if (ops->bind)
- list_for_each_entry(pos, &thermal_cdev_list, node) {
- result = ops->bind(tz, pos);
- if (result)
- break;
- }
mutex_unlock(&thermal_list_lock);
- INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
+ if (ops->bind)
+ schedule_work(&thermal_bind);
- thermal_zone_device_update(tz);
+ INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
if (!result)
return tz;
@@ -1588,6 +1616,7 @@ static int __init thermal_init(void)
{
int result = 0;
+ INIT_WORK(&thermal_bind, thermal_zone_do_bind_work);
result = class_register(&thermal_class);
if (result) {
idr_destroy(&thermal_tz_idr);
@@ -1601,6 +1630,7 @@ static int __init thermal_init(void)
static void __exit thermal_exit(void)
{
+ cancel_work_sync(&thermal_bind);
class_unregister(&thermal_class);
idr_destroy(&thermal_tz_idr);
idr_destroy(&thermal_cdev_idr);
--
1.7.11.3
--
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