From mboxrd@z Thu Jan 1 00:00:00 1970 From: Amit Pundir Subject: [RFC][PATCH 1/2] PM: Print pending wakeup IRQ preventing suspend to dmesg Date: Fri, 1 Aug 2014 22:00:48 +0530 Message-ID: <1406910649-4028-2-git-send-email-amit.pundir@linaro.org> References: <1406910649-4028-1-git-send-email-amit.pundir@linaro.org> Return-path: In-Reply-To: <1406910649-4028-1-git-send-email-amit.pundir@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: Todd Poynor , Pavel Machek , Thomas Gleixner , "Rafael J. Wysocki" , Len Brown , linux-pm@vger.kernel.org, Android Kernel Team , John Stultz , Sumit Semwal , Amit Pundir List-Id: linux-pm@vger.kernel.org From: Todd Poynor Currently when a pending wakeup irq stops suspend, it can be difficult to determine why suspend was prevented and which IRQ was actually responsible. In order to help debug these situations, this patch prints the IRQ number and action name of that pending wakeup irq which prevents suspend. This patch comes from the Android patch set, where its been used to debug suspend problems. Cc: Pavel Machek Cc: Thomas Gleixner Cc: Rafael J. Wysocki Cc: Len Brown Cc: linux-pm@vger.kernel.org Cc: Android Kernel Team Cc: John Stultz Cc: Sumit Semwal Signed-off-by: Todd Poynor [Amit Pundir: Reworded the commit message] Signed-off-by: Amit Pundir --- kernel/irq/pm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c index abcd6ca..c2bc8d9 100644 --- a/kernel/irq/pm.c +++ b/kernel/irq/pm.c @@ -109,8 +109,13 @@ int check_wakeup_irqs(void) * can abort suspend. */ if (irqd_is_wakeup_set(&desc->irq_data)) { - if (desc->depth == 1 && desc->istate & IRQS_PENDING) + if (desc->depth == 1 && desc->istate & IRQS_PENDING) { + pr_info("Wakeup IRQ %d %s pending, suspend aborted\n", + irq, + desc->action && desc->action->name ? + desc->action->name : ""); return -EBUSY; + } continue; } /* -- 1.7.10.4