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authorTejun Heo <tj@kernel.org>2012-12-21 17:56:51 -0800
committerAnton Vorontsov <anton.vorontsov@linaro.org>2013-01-05 14:03:26 -0800
commit2fbb520d2079186727786b728ebc5bf20fc85520 (patch)
treec7367c9e969e7d1e38037b58217dc4c7a71536d5 /drivers/power/charger-manager.c
parent41468a11199212f092cb4c071626785db6a32393 (diff)
charger_manager: Don't use [delayed_]work_pending()
There's no need to test whether a (delayed) work item in pending before queueing, flushing or cancelling it. Most uses are unnecessary and quite a few of them are buggy. Remove unnecessary pending tests and rewrite _setup_polling() so that it uses mod_delayed_work() if the next polling interval is sooner than currently scheduled. queue_delayed_work() is used otherwise. Only compile tested. I noticed that two work items - setup_polling and cm_monitor_work - schedule each other. It's a very unusual construct and I'm fairly sure it's racy. You can't break such circular dependency by calling cancel on each. I strongly recommend revising the mechanism. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Anton Vorontsov <cbou@mail.ru> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Donggeun Kim <dg77.kim@samsung.com> Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'drivers/power/charger-manager.c')
-rw-r--r--drivers/power/charger-manager.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 029732d83090..8acc3f8d303c 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -669,15 +669,21 @@ static void _setup_polling(struct work_struct *work)
WARN(cm_wq == NULL, "charger-manager: workqueue not initialized"
". try it later. %s\n", __func__);
+ /*
+ * Use mod_delayed_work() iff the next polling interval should
+ * occur before the currently scheduled one. If @cm_monitor_work
+ * isn't active, the end result is the same, so no need to worry
+ * about stale @next_polling.
+ */
_next_polling = jiffies + polling_jiffy;
- if (!delayed_work_pending(&cm_monitor_work) ||
- (delayed_work_pending(&cm_monitor_work) &&
- time_after(next_polling, _next_polling))) {
- next_polling = jiffies + polling_jiffy;
+ if (time_before(_next_polling, next_polling)) {
mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
+ next_polling = _next_polling;
+ } else {
+ if (queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy))
+ next_polling = _next_polling;
}
-
out:
mutex_unlock(&cm_list_mtx);
}
@@ -751,8 +757,7 @@ static void misc_event_handler(struct charger_manager *cm,
if (cm_suspended)
device_set_wakeup_capable(cm->dev, true);
- if (!delayed_work_pending(&cm_monitor_work) &&
- is_polling_required(cm) && cm->desc->polling_interval_ms)
+ if (is_polling_required(cm) && cm->desc->polling_interval_ms)
schedule_work(&setup_polling);
uevent_notify(cm, default_event_names[type]);
}
@@ -1170,8 +1175,7 @@ static int charger_extcon_notifier(struct notifier_block *self,
* when charger cable is attached.
*/
if (cable->attached && is_polling_required(cable->cm)) {
- if (work_pending(&setup_polling))
- cancel_work_sync(&setup_polling);
+ cancel_work_sync(&setup_polling);
schedule_work(&setup_polling);
}
@@ -1718,10 +1722,8 @@ static int charger_manager_remove(struct platform_device *pdev)
list_del(&cm->entry);
mutex_unlock(&cm_list_mtx);
- if (work_pending(&setup_polling))
- cancel_work_sync(&setup_polling);
- if (delayed_work_pending(&cm_monitor_work))
- cancel_delayed_work_sync(&cm_monitor_work);
+ cancel_work_sync(&setup_polling);
+ cancel_delayed_work_sync(&cm_monitor_work);
for (i = 0 ; i < desc->num_charger_regulators ; i++) {
struct charger_regulator *charger
@@ -1790,8 +1792,7 @@ static int cm_suspend_prepare(struct device *dev)
cm_suspended = true;
}
- if (delayed_work_pending(&cm->fullbatt_vchk_work))
- cancel_delayed_work(&cm->fullbatt_vchk_work);
+ cancel_delayed_work(&cm->fullbatt_vchk_work);
cm->status_save_ext_pwr_inserted = is_ext_pwr_online(cm);
cm->status_save_batt = is_batt_present(cm);