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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-16 09:59:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-08-16 09:59:00 -0700 |
| commit | 2d2843e614f6f7aced9dd351a056ac1150d3f82f (patch) | |
| tree | 2930c51e63e9f8a69593e4e08023b4bdcfa8df91 | |
| parent | f43c60648f2b093983fe8f6145acef12c48751cb (diff) | |
| parent | 40fea92ffb5fa0ef26d10ae0fe5688bc8e61c791 (diff) | |
| download | linux-2d2843e614f6f7aced9dd351a056ac1150d3f82f.tar.bz2 | |
Merge tag 'pm-3.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management fix from Rafael Wysocki:
"The removal of delayed_work_pending() checks from kernel/power/qos.c
done in 3.9 introduced a deadlock in pm_qos_work_fn().
Fix from Stephen Boyd"
* tag 'pm-3.11-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
PM / QoS: Fix workqueue deadlock when using pm_qos_update_request_timeout()
| -rw-r--r-- | kernel/power/qos.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 06fe28589e9c..a394297f8b2f 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -296,6 +296,17 @@ int pm_qos_request_active(struct pm_qos_request *req) } EXPORT_SYMBOL_GPL(pm_qos_request_active); +static void __pm_qos_update_request(struct pm_qos_request *req, + s32 new_value) +{ + trace_pm_qos_update_request(req->pm_qos_class, new_value); + + if (new_value != req->node.prio) + pm_qos_update_target( + pm_qos_array[req->pm_qos_class]->constraints, + &req->node, PM_QOS_UPDATE_REQ, new_value); +} + /** * pm_qos_work_fn - the timeout handler of pm_qos_update_request_timeout * @work: work struct for the delayed work (timeout) @@ -308,7 +319,7 @@ static void pm_qos_work_fn(struct work_struct *work) struct pm_qos_request, work); - pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE); + __pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE); } /** @@ -364,12 +375,7 @@ void pm_qos_update_request(struct pm_qos_request *req, } cancel_delayed_work_sync(&req->work); - - trace_pm_qos_update_request(req->pm_qos_class, new_value); - if (new_value != req->node.prio) - pm_qos_update_target( - pm_qos_array[req->pm_qos_class]->constraints, - &req->node, PM_QOS_UPDATE_REQ, new_value); + __pm_qos_update_request(req, new_value); } EXPORT_SYMBOL_GPL(pm_qos_update_request); |