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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id cz15-20020a0564021caf00b004589da5e5cesm786114edb.41.2022.11.30.08.29.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Nov 2022 08:29:44 -0800 (PST) From: Ricardo Ribalda Date: Wed, 30 Nov 2022 17:29:21 +0100 Subject: [PATCH v7 2/2] ASoC: SOF: 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-v7-2-127c582f1ca4@chromium.org> References: <20221127-snd-freeze-v7-0-127c582f1ca4@chromium.org> In-Reply-To: <20221127-snd-freeze-v7-0-127c582f1ca4@chromium.org> To: Steven Rostedt , Peter Ujfalusi , Pierre-Louis Bossart , Jaroslav Kysela , Kai Vehmanen , Chromeos Kdump , Mark Brown , Ranjani Sridharan , Eric Biederman , Bard Liao , Daniel Baluta , Liam Girdwood , Takashi Iwai Cc: alsa-devel@alsa-project.org, sound-open-firmware@alsa-project.org, kexec@lists.infradead.org, stable@vger.kernel.org, Ricardo Ribalda , linux-kernel@vger.kernel.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=2186; i=ribalda@chromium.org; h=from:subject:message-id; bh=s0WnrFHmqOACfzcMu26gBeBYl3edpjiybthmxKpH+/s=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjh4Tz1DIcr4kWbbZ1fXNR7GOJEmWiNmJULPm1G4vq 7JEKT8SJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4eE8wAKCRDRN9E+zzrEiCmTD/ 9r90EMfLYitLj+CAj5pTW15Y84UH1h3P61FQVh32MliSSUHIdaXNjseCKrv7e+tRpc41lSmcj/OW74 WxrUoPxQ1Hktiy++0SXNp4dS91cD+tbXSaBxWj4qoKjJOq0JH+W60hWylFoZ2/Om+iyC2ul4p4tlqS dLqbMKMExGlamGKbby4s30fBpiAf8AlaeucTa92XDjOkMh27VVRldIAwqJWJopV9PuD8JzoMUGZ90L /bXspDsLDMWxAklJhaDhZXnyaUb/nXV4fyfpMkrIVptlxBnU7Bjt7lnxMRO6nmXIE0ukVeedXvacU5 8mxayfCFK1shZEtL7dOFQsmKWJFX3dFCX6NGYbw1A452mgfZZS4rLwkVpBlzKdrir8u6NwERyd5sEI InfH5v89rrFOTctLuieBszRFPTd6pZhoS0reV7c1tyqR87MJvAXGNdvnEJawj9LSFmQXUOF3fxBho+ NXeyIahMvQZrYm43EwYWLNdvflN+eBi5mRkOWJlLb1IsHfDZdZV3Esdzse4iw2k/dHLRN2j2cN4NMq evboar7x2Z0aZo1yEP9zFjFAS3V7tnv2ZayHWT3F5veuN2sPxKpy4/MQSY8tibH0uGYZDi7/UCdIlX 4+H6VL5A+bSxCSTd/vzO13wZs8Y+XagJNmDmIxBL/e3Tf4M7ZjMznFTHqfuw== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org During kexec(), the userspace might frozen. Therefore we cannot wait for it to complete. During a kexec with frozen processe do not unregister the clients. 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 Cc: stable@vger.kernel.org Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drive= rs in .shutdown") Signed-off-by: Ricardo Ribalda --- sound/soc/sof/core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c index 3e6141d03770..4301f347bb90 100644 --- a/sound/soc/sof/core.c +++ b/sound/soc/sof/core.c @@ -9,6 +9,7 @@ // =20 #include +#include #include #include #include @@ -484,7 +485,8 @@ int snd_sof_device_shutdown(struct device *dev) * make sure clients and machine driver(s) are unregistered to force * all userspace devices to be closed prior to the DSP shutdown sequence */ - sof_unregister_clients(sdev); + if (!kexec_with_frozen_processes()) + sof_unregister_clients(sdev); =20 snd_sof_machine_unregister(sdev, pdata); =20 --=20 2.38.1.584.g0f3c55d4c2-goog-b4-0.11.0-dev-696ae