From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5305B227EBD; Tue, 8 Apr 2025 11:43:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744112613; cv=none; b=sa+9LZffmtIJpDHzo6DMg6vtlGuV7arsrLCY5gLUB2HJ6SDSHGWe+qMu31BRIkU5F1JSTVxUb45aQZByGsxgGqR3gNXEtAUdHZxhurF7ufTh8jy0gndpzo/l6ie6zF3Ke7mLY3wSmkv3GSH3rmqFed202vuTdR4765qAzJE/Kls= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744112613; c=relaxed/simple; bh=ZewiOQJBgIOHgEuDVVjUbc/MK21jDn/la3EEHbFiFDA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DbG7QhOFr/p3c9YFLkZVkwhz+j0msxweLaCCYH9HuT9nscwKCHiSMS5sbY4ZHSWgZgVwZo/1hrT8Gb6PhvICtUWQfI83/myxadgCW/mDTJ/Wjq2Z9D5Q3JZBQmfGMtwxIZt4p4j7UzjxxIw2p8Qn2gL1YWDqoY6ovGaqkszX0dM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FLxsYXgb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="FLxsYXgb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC5A4C4CEE5; Tue, 8 Apr 2025 11:43:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744112613; bh=ZewiOQJBgIOHgEuDVVjUbc/MK21jDn/la3EEHbFiFDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FLxsYXgbrYSF0g/0l2innypOkmmdcQWzb+72AO0RtjZkHQhF2wyX5WDAqOvMyf9Dy 8gWnNLukJRfhyMDgSzaLlJLbHAKDNBMN2+qhSra/0Z+JCtsJOr2pFK14q8R9YzpYrz hv6Hn8bKCleFaKfoc0Q7leroO5+k35pOKftpMKys= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Rafael J. Wysocki" , Ulf Hansson , Sasha Levin Subject: [PATCH 5.15 134/279] PM: sleep: Adjust check before setting power.must_resume Date: Tue, 8 Apr 2025 12:48:37 +0200 Message-ID: <20250408104829.958001180@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104826.319283234@linuxfoundation.org> References: <20250408104826.319283234@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rafael J. Wysocki [ Upstream commit eeb87d17aceab7803a5a5bcb6cf2817b745157cf ] The check before setting power.must_resume in device_suspend_noirq() does not take power.child_count into account, but it should do that, so use pm_runtime_need_not_resume() in it for this purpose and adjust the comment next to it accordingly. Fixes: 107d47b2b95e ("PM: sleep: core: Simplify the SMART_SUSPEND flag handling") Signed-off-by: Rafael J. Wysocki Reviewed-by: Ulf Hansson Link: https://patch.msgid.link/3353728.44csPzL39Z@rjwysocki.net Signed-off-by: Sasha Levin --- drivers/base/power/main.c | 13 ++++++------- drivers/base/power/runtime.c | 2 +- include/linux/pm_runtime.h | 2 ++ 3 files changed, 9 insertions(+), 8 deletions(-) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 185ea0d93a5e5..8586651320901 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1239,14 +1239,13 @@ static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool a dev->power.is_noirq_suspended = true; /* - * Skipping the resume of devices that were in use right before the - * system suspend (as indicated by their PM-runtime usage counters) - * would be suboptimal. Also resume them if doing that is not allowed - * to be skipped. + * Devices must be resumed unless they are explicitly allowed to be left + * in suspend, but even in that case skipping the resume of devices that + * were in use right before the system suspend (as indicated by their + * runtime PM usage counters and child counters) would be suboptimal. */ - if (atomic_read(&dev->power.usage_count) > 1 || - !(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) && - dev->power.may_skip_resume)) + if (!(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) && + dev->power.may_skip_resume) || !pm_runtime_need_not_resume(dev)) dev->power.must_resume = true; if (dev->power.must_resume) diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c index 6699096ff2fa6..edee7f1af1cec 100644 --- a/drivers/base/power/runtime.c +++ b/drivers/base/power/runtime.c @@ -1809,7 +1809,7 @@ void pm_runtime_drop_link(struct device_link *link) pm_request_idle(link->supplier); } -static bool pm_runtime_need_not_resume(struct device *dev) +bool pm_runtime_need_not_resume(struct device *dev) { return atomic_read(&dev->power.usage_count) <= 1 && (atomic_read(&dev->power.child_count) == 0 || diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h index 9a10b6bac4a71..ed01ae76e2fa5 100644 --- a/include/linux/pm_runtime.h +++ b/include/linux/pm_runtime.h @@ -46,6 +46,7 @@ static inline bool queue_pm_work(struct work_struct *work) extern int pm_generic_runtime_suspend(struct device *dev); extern int pm_generic_runtime_resume(struct device *dev); +extern bool pm_runtime_need_not_resume(struct device *dev); extern int pm_runtime_force_suspend(struct device *dev); extern int pm_runtime_force_resume(struct device *dev); @@ -234,6 +235,7 @@ static inline bool queue_pm_work(struct work_struct *work) { return false; } static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } +static inline bool pm_runtime_need_not_resume(struct device *dev) {return true; } static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } static inline int pm_runtime_force_resume(struct device *dev) { return 0; } -- 2.39.5