From patchwork Tue Mar 11 16:08:23 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ulf Hansson X-Patchwork-Id: 872735 Received: from mail-lj1-f171.google.com (mail-lj1-f171.google.com [209.85.208.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B91825FA1C for ; Tue, 11 Mar 2025 16:08:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741709320; cv=none; b=I8YzfLundTsjsI146zaxXfiDwZ0x6rQo3P3cJq6W7ow9a2+3DKEJ1/8jJfZO3ad08/8EbuALK7zozZmDAo7YIjv5WJNGTtDGDmuJB8d5AjGzaNXPFUaITMGA0X9zTMG0eg6SEAHvK7l9ORRYS74x801trKVi8Sc0fyzzOd2Y4sA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741709320; c=relaxed/simple; bh=0JyQVQNXAvmJ1/n8UxRyRWsOn+wf5nWtMrbcEr1qgqY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MPHOVMmoonETDS/R/2rmwkKnkdfL7Aty+xsPC3lGxXeOFkViQHNqCVWLJKHFKB3fDWSk0OTA1byZl6C2IzDZIGVfzyndUtYkFq3Zcd318vqmqMRsnzjBRolzj3JHeT3fRobgWrF1fVcaTExBpzrBfThaOPR2pWrzCc3nVpRozJs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org; spf=pass smtp.mailfrom=linaro.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b=hTbbffLr; arc=none smtp.client-ip=209.85.208.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linaro.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="hTbbffLr" Received: by mail-lj1-f171.google.com with SMTP id 38308e7fff4ca-30762598511so60949091fa.0 for ; Tue, 11 Mar 2025 09:08:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1741709315; x=1742314115; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=kcjlvQ20Z+LP3Azhfy6nFMLexKDv2Y/3x8IawyIsoTw=; b=hTbbffLrkgs8aWE0ihiJgubeavcGhEQG6xM/foE2BNKjgqINpGUMGbOOqm8crtsKFU XVES0G8uZ99YcU3NYYD7YCN6XjCBLHb6qyBkR9wvQC3UcMp2m4jNrSoHaJm+hnbrbaRf WFmH2La8YZe+zMSQgaK7WHL52wS4lbLk2PwEf+Tww33CUtTm9Uy+4EG8nGN4MULxrdHh IpiE65qmMQIUJPcCLQMtbYuFTN5Oty5XUrdNFH31AnLfkQ6I/K1I7TMX6JSTWshiHqV7 7SeNq06JmQXDjQ7siQwXvd8DFt+4QxG6jgjaAFKNCNsGaw4DLRQCu9FllDvHO1Z0d8gj 86lg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741709315; x=1742314115; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=kcjlvQ20Z+LP3Azhfy6nFMLexKDv2Y/3x8IawyIsoTw=; b=G2Dy25DxwFfupZOqNMyaSfTGDE5sfP0mMJLYG3MwhooJ4hlwx1hMD+CUWUAsSwfztj PGgB5smUaPICDJz+j/Mto5qcH7YUbtAwBt/bbxCnLQgizSm2O5fg44AvGsd9IoM6ROnb yYlb5Oic2WDU9M05WCe3anwwTplZ9QIxqTglcM5bEQ6vP3Ez104cs9ut31SSdw4EyyGp EtKsgNihBu3o6PIgCUOHDkCwyHeuwyKKENOnhuVRFLyP9pipADzE0r51Kdckla9iLNCQ k0UBvUgqVDaUlGOe0F/RX89MXlkU9Eug4A6zraAmqXUpEoxj2epkTdapXH9nNP3G25IC O+Vw== X-Forwarded-Encrypted: i=1; AJvYcCW6gTXAfcF3gswqlt1DoZlpVpxZACq98RBYR6PhAgfJYdcYnRV9mNCoDY4k3Mk9Yj8QthHgAhrUrw==@vger.kernel.org X-Gm-Message-State: AOJu0YwK+tgjimj4WAYGoVRTWhTnpLkfciOd22l1gWt4gZw8yQzJKMpQ G1Fnwy+bmA/+ry1eV2vsp/qkIy532ruhWH9ZocQ2HrgpHd8h50SOL0DO3tp8584= X-Gm-Gg: ASbGncuXjh3LZR2p4wGRNUTI1UNj6us/Vyn3Dl7narZMaNGA1thUxBtXb5hbt6poIJs UB3csX7O66lWWyh/rKDrdJ5URnv/DriZoLvJH76OLIFrM2M4BYrmDvcI50TFLzaf9XM+TPFsG8j +kF6cZ2z1fGAf434VnKf/xD4hQBtT1uWRFTRUFYyrQawsKywLVi8kxu9zAEs2RBhH6gMM1NzTI7 g5kqXBBd9XA8nL2zhEhUAogfYVCf3sWTfIVczO9haomOSqu2KUwJ7kjMODt0GwpuMszfpmtyCRz cwVeHoANhx7wmDanY9jlvoD2VGpO4LcMJPJjGwZB1v7SMn/ul1tDL+jR1gd+pyXWWyWpG1tJeJo OzLu+J7sqI8M9n109VCg= X-Google-Smtp-Source: AGHT+IHqEinybzI7v0pVnETj2v5LwyPFnNPlZDH83XrlF6Z5frt4mvnADmS29mGe3LSIyUVtpKjvJA== X-Received: by 2002:a2e:a9a7:0:b0:30b:cef8:de87 with SMTP id 38308e7fff4ca-30bf44fa059mr66552361fa.4.1741709315430; Tue, 11 Mar 2025 09:08:35 -0700 (PDT) Received: from uffe-tuxpro14.. (h-178-174-189-39.A498.priv.bahnhof.se. [178.174.189.39]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-30be9918c54sm20761671fa.62.2025.03.11.09.08.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Mar 2025 09:08:34 -0700 (PDT) From: Ulf Hansson To: "Rafael J . Wysocki" , linux-pm@vger.kernel.org Cc: Len Brown , Pavel Machek , Ulf Hansson , linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] PM: s2idle: Extend comment in s2idle_enter() Date: Tue, 11 Mar 2025 17:08:23 +0100 Message-ID: <20250311160827.1129643-3-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250311160827.1129643-1-ulf.hansson@linaro.org> References: <20250311160827.1129643-1-ulf.hansson@linaro.org> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The s2idle_lock must be held while checking for a pending wakeup and while moving into S2IDLE_STATE_ENTER, to make sure a wakeup doesn't get lost. Let's extend the comment in the code to make this clear. Signed-off-by: Ulf Hansson --- Changes in v2: - New patch. Suggested by Rafael. --- kernel/power/suspend.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c index 90fb06ca07d2..b7aa1db278ff 100644 --- a/kernel/power/suspend.c +++ b/kernel/power/suspend.c @@ -91,8 +91,12 @@ static void s2idle_enter(void) { trace_suspend_resume(TPS("machine_suspend"), PM_SUSPEND_TO_IDLE, true); - /* CPUs can't be hotplugged here so let's not protect for it. */ - + /* + * The s2idle_lock must be held while checking for a pending wakeup and + * while moving into S2IDLE_STATE_ENTER, to make sure a wakeup doesn't + * get lost. Note also that CPUs can't be hotplugged here so let's not + * protect for it. + */ raw_spin_lock_irq(&s2idle_lock); if (pm_wakeup_pending()) goto out;