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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id p35-20020a056402502300b00463b9d47e1fsm4932346eda.71.2022.11.28.01.10.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Nov 2022 01:10:36 -0800 (PST) From: Ricardo Ribalda Date: Mon, 28 Nov 2022 10:10:13 +0100 Subject: [PATCH v3 1/2] freezer: Add processes_frozen() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20221127-snd-freeze-v3-1-a2eda731ca14@chromium.org> References: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> In-Reply-To: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> To: Takashi Iwai , Len Brown , Pierre-Louis Bossart , Kai Vehmanen , Ranjani Sridharan , Mark Brown , Jaroslav Kysela , Pavel Machek , "Rafael J. Wysocki" Cc: alsa-devel@alsa-project.org, "Joel Fernandes (Google)" , Ricardo Ribalda , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1657; i=ribalda@chromium.org; h=from:subject:message-id; bh=4IJsRzjRUBmI8ELm76XeH219TKYxoCY1FpvtAWp9NN8=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjhHsGpUmHDy4LbKwnpR9Rk9CtwMEd0pQpdx1IE0fb 6zgFBL2JAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4R7BgAKCRDRN9E+zzrEiO42EA CHpbt3xEX9Nc3qtOSj8Ch4ZuO/hdfkPBhyD4C5+ZvwkIovXOt2hSP+891sKUfkvG7jPbx1tB/SgbSI 6sdu+55LjjUnH2dANbcNuS79O2FpFCYNPpE7Ay2qDBZZuDb+WP27IOBVfrv7L8+ACy2tqqjELzCwnT Q/cZViMSJcGnr5llb+IkzVUz3GVqKc3UKyglcwyP+e+McJFKPsxcUUXhniivY1uTPl4I/maBS/zhbq JqBbCuNwXr6Ef3ySgmBCEYGWwuNhbray7QfkYId1aJJa/JnGQ9jQyMM8cdB23ByMOtwVXsBCFUxTUa pV2JI//mgbwcjyFitY+33Alk8p+CsZw5/sWyW7TXQTH6t0nZyRLCz3zBvQPAi2HaL1w2E+++dpVUNz a86ZD49Njb4GiF19mePCzi3LfsNW07Bz/82Y8NAvyip9oOn4tHhyg2og9wav1n+LzgJj9Fem71kBlz 75EWG3p/2TiX1aZEaHPCDEX6489tafeRTG1taPq/CgRlcPPxrOfQiOu60xgrq5jDxY7kknT/c0sR22 bZgxjhGx1MwW6PyoDItmvdmEbbPpFnuWZm1THQuvBTpjP+8H6RUt8LvdpbByM41YDFFj/J0qmtyzGX eqihKxGfFODDE3f1r8ri8YaQZECqCn/S4KZvPmGqw+WYi2FVvZ9JYmvN0cPQ== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a way to let the drivers know if the processes are frozen. This is needed by drivers that are waiting for processes to end on their shutdown path. Signed-off-by: Ricardo Ribalda --- include/linux/freezer.h | 2 ++ kernel/freezer.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/freezer.h b/include/linux/freezer.h index b303472255be..ca861ace0689 100644 --- a/include/linux/freezer.h +++ b/include/linux/freezer.h @@ -47,6 +47,7 @@ extern int freeze_processes(void); extern int freeze_kernel_threads(void); extern void thaw_processes(void); extern void thaw_kernel_threads(void); +bool processes_frozen(void); =20 static inline bool try_to_freeze(void) { @@ -80,6 +81,7 @@ static inline int freeze_processes(void) { return -ENOSYS= ; } static inline int freeze_kernel_threads(void) { return -ENOSYS; } static inline void thaw_processes(void) {} static inline void thaw_kernel_threads(void) {} +static inline bool processes_frozen(void) { return false; } =20 static inline bool try_to_freeze(void) { return false; } =20 diff --git a/kernel/freezer.c b/kernel/freezer.c index 4fad0e6fca64..08828c4e12fd 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -233,3 +233,14 @@ bool set_freezable(void) return try_to_freeze(); } EXPORT_SYMBOL(set_freezable); + +/** + * processes_frozen - Check if the processes are frozen + * + * Let drivers know if they shall wait for processes. + */ +bool processes_frozen(void) +{ + return pm_freezing; +} +EXPORT_SYMBOL(processes_frozen); --=20 2.38.1.584.g0f3c55d4c2-goog-b4-0.11.0-dev-696ae From nobody Fri Sep 19 05:52:27 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2A25C433FE for ; Mon, 28 Nov 2022 09:10:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230001AbiK1JKs (ORCPT ); Mon, 28 Nov 2022 04:10:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229787AbiK1JKk (ORCPT ); Mon, 28 Nov 2022 04:10:40 -0500 Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 574AD1839E for ; Mon, 28 Nov 2022 01:10:39 -0800 (PST) Received: by mail-ej1-x62e.google.com with SMTP id td2so9992007ejc.5 for ; Mon, 28 Nov 2022 01:10:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=9ubdN1bACjKh+qjO28e9C129nQGAl5iy3AArXYr64tA=; b=CGIt3hTLCHNo7o4kNPYEi01hMNFq6HcqbpnhXDpYaolzFNCWPKZDVAiKB0j/C5S+O0 0XBTmjLWIAsGP7fP+zKvcfefLmGVkmOKMAulmY0h4aUBuLvXLckOD+81KwAaEuJjZUni TtdfCWzaJp5TO9hlGKgX6DsLDa3FClxwPkUlo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=9ubdN1bACjKh+qjO28e9C129nQGAl5iy3AArXYr64tA=; b=eQvinV5kRqwYF/F9X0Gv32KyX+JDhQSqAo+xGZQ09vmulp9JPP6hCU+uRoxicykGIs e4XFRdhjf9vdL969sZEk/J+BhAuSBCEHdUZo0ybDhr7df/w4u66SNe1VcfnIcppb2GMA Vl2Y4/PhOfkWmqB6UE1CEcvER9kecEOZM3ybKP4QK70YKAricyvtj9QQRmT+3crbYD7H Y7z90JG1Lvo5P53hBW9SD7M2CAhkJMuMYpJ5ldgfUwi7Ddqv7/UgiLs+TVY0cCI2MSHO cPBVikGhYTWl5/zUktKOhn4IoW3Wf+HLbxDMW0KH2EgeQMzdmip2KnOjJQ1D5icEqthv 6u6Q== X-Gm-Message-State: ANoB5pmR2LHWAuRzYigKd1dgyw7HW1QmLt2LxbHqSj9syZ8AG8D6VwTF JNLrrdHCmZ9hP6+BP9KLJ7IFqA== X-Google-Smtp-Source: AA0mqf7CDadNIIxLmDaGMGWeVngi50o9v9Dqym8FZqs9w0o8qAyuABJVXcuAWg331ZRRka79f2HTMg== X-Received: by 2002:a17:906:65c4:b0:7ad:d250:b907 with SMTP id z4-20020a17090665c400b007add250b907mr42053835ejn.737.1669626637954; Mon, 28 Nov 2022 01:10:37 -0800 (PST) Received: from alco.roam.corp.google.com (80.71.134.83.ipv4.parknet.dk. [80.71.134.83]) by smtp.gmail.com with ESMTPSA id p35-20020a056402502300b00463b9d47e1fsm4932346eda.71.2022.11.28.01.10.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Nov 2022 01:10:37 -0800 (PST) From: Ricardo Ribalda Date: Mon, 28 Nov 2022 10:10:14 +0100 Subject: [PATCH v3 2/2] ALSA: core: Fix deadlock when shutdown a frozen userspace MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20221127-snd-freeze-v3-2-a2eda731ca14@chromium.org> References: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> In-Reply-To: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> To: Takashi Iwai , Len Brown , Pierre-Louis Bossart , Kai Vehmanen , Ranjani Sridharan , Mark Brown , Jaroslav Kysela , Pavel Machek , "Rafael J. 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This fixes: [ 84.943749] Freezing user space processes ... (elapsed 0.111 seconds) do= ne. [ 246.784446] INFO: task kexec-lite:5123 blocked for more than 122 seconds. [ 246.819035] Call Trace: [ 246.821782] [ 246.824186] __schedule+0x5f9/0x1263 [ 246.828231] schedule+0x87/0xc5 [ 246.831779] snd_card_disconnect_sync+0xb5/0x127 ... [ 246.889249] snd_sof_device_shutdown+0xb4/0x150 [ 246.899317] pci_device_shutdown+0x37/0x61 [ 246.903990] device_shutdown+0x14c/0x1d6 [ 246.908391] kernel_kexec+0x45/0xb9 And: [ 246.893222] INFO: task kexec-lite:4891 blocked for more than 122 seconds. [ 246.927709] Call Trace: [ 246.930461] [ 246.932819] __schedule+0x5f9/0x1263 [ 246.936855] ? fsnotify_grab_connector+0x5c/0x70 [ 246.942045] schedule+0x87/0xc5 [ 246.945567] schedule_timeout+0x49/0xf3 [ 246.949877] wait_for_completion+0x86/0xe8 [ 246.954463] snd_card_free+0x68/0x89 ... [ 247.001080] platform_device_unregister+0x12/0x35 Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drive= rs in .shutdown") Signed-off-by: Ricardo Ribalda --- sound/core/init.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/sound/core/init.c b/sound/core/init.c index 5377f94eb211..bc038b49d4d3 100644 --- a/sound/core/init.c +++ b/sound/core/init.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -573,6 +574,11 @@ void snd_card_disconnect_sync(struct snd_card *card) return; } =20 + if (processes_frozen()) { + dev_err(card->dev, "Userspace is frozen, skipping sync\n"); + return; + } + spin_lock_irq(&card->files_lock); wait_event_lock_irq(card->remove_sleep, list_empty(&card->files_list), @@ -658,6 +664,13 @@ int snd_card_free(struct snd_card *card) ret =3D snd_card_free_when_closed(card); if (ret) return ret; + + /* + * If userspace is frozen the wait from completion will never end. + */ + if (processes_frozen()) + return 0; + /* wait, until all devices are ready for the free operation */ wait_for_completion(&released); =20 --=20 2.38.1.584.g0f3c55d4c2-goog-b4-0.11.0-dev-696ae