From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [RFC PATCH 1/4] PM / QoS: Add pm_qos_cancel_request_lazy() that doesn't sleep Date: Tue, 24 Mar 2015 15:40:37 +0200 Message-ID: <1427204440-3533-2-git-send-email-adrian.hunter@intel.com> References: <1427204440-3533-1-git-send-email-adrian.hunter@intel.com> Return-path: In-Reply-To: <1427204440-3533-1-git-send-email-adrian.hunter@intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Ulf Hansson Cc: linux-mmc , "Rafael J. Wysocki" , Len Brown , Pavel Machek , Kevin Hilman , Tomeu Vizoso , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-mmc@vger.kernel.org Add pm_qos_cancel_request_lazy() which is convenient for contexts that may not sleep. Signed-off-by: Adrian Hunter --- include/linux/pm_qos.h | 2 ++ kernel/power/qos.c | 20 ++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index 7b3ae0c..f44d353 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -126,6 +126,8 @@ void pm_qos_update_request(struct pm_qos_request *req, s32 new_value); void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value, unsigned long timeout_us); +void pm_qos_cancel_request_lazy(struct pm_qos_request *req, + unsigned int timeout_us); void pm_qos_remove_request(struct pm_qos_request *req); int pm_qos_request(int pm_qos_class); diff --git a/kernel/power/qos.c b/kernel/power/qos.c index 97b0df7..ac131cb 100644 --- a/kernel/power/qos.c +++ b/kernel/power/qos.c @@ -517,6 +517,26 @@ void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value, } /** + * pm_qos_cancel_request_lazy - cancels an existing qos request lazily. + * @req : handle to list element holding a pm_qos request to use + * @timeout_us: the delay before cancelling this qos request in usecs. + * + * After timeout_us, this qos request is cancelled. + */ +void pm_qos_cancel_request_lazy(struct pm_qos_request *req, + unsigned int timeout_us) +{ + if (!req) + return; + if (WARN(!pm_qos_request_active(req), + "%s called for unknown object.", __func__)) + return; + + schedule_delayed_work(&req->work, usecs_to_jiffies(timeout_us)); +} +EXPORT_SYMBOL_GPL(pm_qos_cancel_request_lazy); + +/** * pm_qos_remove_request - modifies an existing qos request * @req: handle to request list element * -- 1.9.1