From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 72A35C433EF for ; Fri, 24 Sep 2021 12:45:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5C38661261 for ; Fri, 24 Sep 2021 12:45:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343804AbhIXMqg (ORCPT ); Fri, 24 Sep 2021 08:46:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:41740 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343841AbhIXMqN (ORCPT ); Fri, 24 Sep 2021 08:46:13 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 148D66124D; Fri, 24 Sep 2021 12:44:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632487480; bh=VG+frtPWR7Hugbx58zvTwHatZg/pksRVcznDr+TupUc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L2SHg4gJw7RZfZlJTb96Hw3hr6f5N4aFJsLncsEXrLwSCM0v4WOrgX3GMITA/YtqN 5j6FEoPkCLeo6NlREuSqb5dVUzU0Y2q50fv8ANADX4cKg0KuUSnObdQXdbtWNEUwQM 5pARwEuT6LGWN9D7CzlzsKqIrbCyt4UqDB0CZdfU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tony Lindgren , "Rafael J. Wysocki" , "Nobuhiro Iwamatsu (CIP)" Subject: [PATCH 4.4 02/23] PM / wakeirq: Fix unbalanced IRQ enable for wakeirq Date: Fri, 24 Sep 2021 14:43:43 +0200 Message-Id: <20210924124327.901559315@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210924124327.816210800@linuxfoundation.org> References: <20210924124327.816210800@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Tony Lindgren commit 69728051f5bf15efaf6edfbcfe1b5a49a2437918 upstream. If a device is runtime PM suspended when we enter suspend and has a dedicated wake IRQ, we can get the following warning: WARNING: CPU: 0 PID: 108 at kernel/irq/manage.c:526 enable_irq+0x40/0x94 [ 102.087860] Unbalanced enable for IRQ 147 ... (enable_irq) from [] (dev_pm_arm_wake_irq+0x4c/0x60) (dev_pm_arm_wake_irq) from [] (device_wakeup_arm_wake_irqs+0x58/0x9c) (device_wakeup_arm_wake_irqs) from [] (dpm_suspend_noirq+0x10/0x48) (dpm_suspend_noirq) from [] (suspend_devices_and_enter+0x30c/0xf14) (suspend_devices_and_enter) from [] (enter_state+0xad4/0xbd8) (enter_state) from [] (pm_suspend+0x38/0x98) (pm_suspend) from [] (state_store+0x68/0xc8) This is because the dedicated wake IRQ for the device may have been already enabled earlier by dev_pm_enable_wake_irq_check(). Fix the issue by checking for runtime PM suspended status. This issue can be easily reproduced by setting serial console log level to zero, letting the serial console idle, and suspend the system from an ssh terminal. On resume, dmesg will have the warning above. The reason why I have not run into this issue earlier has been that I typically run my PM test cases from on a serial console instead over ssh. Fixes: c84345597558 (PM / wakeirq: Enable dedicated wakeirq for suspend) Signed-off-by: Tony Lindgren Signed-off-by: Rafael J. Wysocki Signed-off-by: Nobuhiro Iwamatsu (CIP) Signed-off-by: Greg Kroah-Hartman --- drivers/base/power/wakeirq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/base/power/wakeirq.c +++ b/drivers/base/power/wakeirq.c @@ -320,7 +320,8 @@ void dev_pm_arm_wake_irq(struct wake_irq return; if (device_may_wakeup(wirq->dev)) { - if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED) + if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED && + !pm_runtime_status_suspended(wirq->dev)) enable_irq(wirq->irq); enable_irq_wake(wirq->irq); @@ -342,7 +343,8 @@ void dev_pm_disarm_wake_irq(struct wake_ if (device_may_wakeup(wirq->dev)) { disable_irq_wake(wirq->irq); - if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED) + if (wirq->status & WAKE_IRQ_DEDICATED_ALLOCATED && + !pm_runtime_status_suspended(wirq->dev)) disable_irq_nosync(wirq->irq); } }