This is a note to let you know that I've just added the patch titled PM / QoS: Fix workqueue deadlock when using pm_qos_update_request_timeout() to the 3.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: pm-qos-fix-workqueue-deadlock-when-using-pm_qos_update_request_timeout.patch and it can be found in the queue-3.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 40fea92ffb5fa0ef26d10ae0fe5688bc8e61c791 Mon Sep 17 00:00:00 2001 From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Date: Tue, 13 Aug 2013 14:12:40 -0700 Subject: PM / QoS: Fix workqueue deadlock when using pm_qos_update_request_timeout() From: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> commit 40fea92ffb5fa0ef26d10ae0fe5688bc8e61c791 upstream. pm_qos_update_request_timeout() updates a qos and then schedules a delayed work item to bring the qos back down to the default after the timeout. When the work item runs, pm_qos_work_fn() will call pm_qos_update_request() and deadlock because it tries to cancel itself via cancel_delayed_work_sync(). Future callers of that qos will also hang waiting to cancel the work that is canceling itself. Let's extract the little bit of code that does the real work of pm_qos_update_request() and call it from the work function so that we don't deadlock. Before ed1ac6e (PM: don't use [delayed_]work_pending()) this didn't happen because the work function wouldn't try to cancel itself. [backport to 3.10 - gregkh] Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> Reviewed-by: Tejun Heo <tj@xxxxxxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- kernel/power/qos.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -293,6 +293,15 @@ int pm_qos_request_active(struct pm_qos_ } EXPORT_SYMBOL_GPL(pm_qos_request_active); +static void __pm_qos_update_request(struct pm_qos_request *req, + s32 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) @@ -305,7 +314,7 @@ static void pm_qos_work_fn(struct work_s struct pm_qos_request, work); - pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE); + __pm_qos_update_request(req, PM_QOS_DEFAULT_VALUE); } /** @@ -365,6 +374,8 @@ void pm_qos_update_request(struct pm_qos 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); Patches currently in stable-queue which might be from sboyd@xxxxxxxxxxxxxx are queue-3.10/perf-arm-fix-armpmu_map_hw_event.patch queue-3.10/pm-qos-fix-workqueue-deadlock-when-using-pm_qos_update_request_timeout.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html