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GET /api/1.1/patches/2220767/?format=api
{ "id": 2220767, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220767/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260408004333.236687-2-acelan.kao@canonical.com/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/1.1/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null }, "msgid": "<20260408004333.236687-2-acelan.kao@canonical.com>", "date": "2026-04-08T00:43:33", "name": "[SRU,R,1/1] wifi: mt76: mt792x: Fix a potential deadlock in high-load situations", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c8b2e698179438ede3a7ff606127541a7b0834f6", "submitter": { "id": 2976, "url": "http://patchwork.ozlabs.org/api/1.1/people/2976/?format=api", "name": "AceLan Kao", "email": "acelan.kao@canonical.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20260408004333.236687-2-acelan.kao@canonical.com/mbox/", "series": [ { "id": 499055, "url": "http://patchwork.ozlabs.org/api/1.1/series/499055/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=499055", "date": "2026-04-08T00:43:32", "name": "System doesn't response with mt76 call trace", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499055/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220767/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220767/checks/", "tags": {}, "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=bpqKTM4+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ubuntu.com\n (client-ip=185.125.189.65; helo=lists.ubuntu.com;\n envelope-from=kernel-team-bounces@lists.ubuntu.com;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from lists.ubuntu.com (lists.ubuntu.com [185.125.189.65])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fr47W2V6pz1yD3\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 08 Apr 2026 10:43:51 +1000 (AEST)", "from localhost ([127.0.0.1] helo=lists.ubuntu.com)\n\tby lists.ubuntu.com with esmtp (Exim 4.86_2)\n\t(envelope-from <kernel-team-bounces@lists.ubuntu.com>)\n\tid 1wAH1E-0001Gu-KF; Wed, 08 Apr 2026 00:43:44 +0000", "from mail-qv1-f44.google.com ([209.85.219.44])\n by lists.ubuntu.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.86_2) (envelope-from <acelan@gmail.com>) id 1wAH1C-0001Fz-Q3\n for kernel-team@lists.ubuntu.com; Wed, 08 Apr 2026 00:43:43 +0000", "by mail-qv1-f44.google.com with SMTP id\n 6a1803df08f44-899a5db525cso52656106d6.3\n for <kernel-team@lists.ubuntu.com>; Tue, 07 Apr 2026 17:43:42 -0700 (PDT)", "from localhost (211-75-139-220.hinet-ip.hinet.net. [211.75.139.220])\n by smtp.gmail.com with ESMTPSA id\n 6a1803df08f44-8a596e03cd8sm152563386d6.33.2026.04.07.17.43.39\n for <kernel-team@lists.ubuntu.com>\n (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);\n Tue, 07 Apr 2026 17:43:40 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=gmail.com; s=20251104; t=1775609021; x=1776213821; darn=lists.ubuntu.com;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:to:from:sender:from:to:cc:subject:date\n :message-id:reply-to;\n bh=BgDV5j4PhfS4Z/d95FgRqqJNbxVbxSxyyW+/zYmzwEU=;\n b=bpqKTM4+w4/iLjPDSmJRLgRiY39XAwzUiI3A6vuuCdRoXB9kxwY3TZrYuHvld8ww/U\n 7J30MPUc5kVUYMUdbHFospUXOUesDQm67f9ha0/+kRHIlQKETp/za8FTK8+BaaFRrXQ2\n XdJw1bkiWAuj1u9Glv1j0xqKOcJWGJ8hb7DIhPDJMcdx2CJjeF+kevlPNjBgC4UPxDPf\n FcYxZ8dpnF71UZE8QEylyXFzzQ8+MSneRHxlwd1fpMiCiExNzmEVKV+pZ6RS+QZDRkG7\n wQGNgQlZC6lw/803Ez2lzFc+0YHsEBRHBIYx00Kfvw6ViPVSaizBJFLjnPxrSEmIIeJD\n VojA==", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n d=1e100.net; s=20251104; t=1775609021; x=1776213821;\n h=content-transfer-encoding:mime-version:references:in-reply-to\n :message-id:date:subject:to:from:sender:x-gm-gg:x-gm-message-state\n :from:to:cc:subject:date:message-id:reply-to;\n bh=BgDV5j4PhfS4Z/d95FgRqqJNbxVbxSxyyW+/zYmzwEU=;\n b=M2NL9u/wHZOTqxzBMWiKRcfrvb4l+Q3MKbenZvXbSoLRwauvvgefbul9OceeZ5Jo2D\n efY80RVsiTkrpJC46ngUxn6cNrOmbAlz8OlBiR+Y4cMOcgi+O8BIk8esDJruq0vH9QZT\n 782KvB1oJYUxNoA+PNi7279A0Q7dJncUe5ZvZbU5WZLcLqe4CPFQD7zT8IoZw6TIvZXq\n 8+YQ+W66FPzTHJ1qy7HPFS1c+g3I1MRbyPoUz2kW5KdkypdeUp1IkwLg/srHsIfhdUo9\n PVwpJBXlA+4luNnAWqF+3ZjGWFu0Sv5OEcJHohACfBV7f2HYbqyILsPOYNql4BNrEpKX\n J/UQ==", "X-Gm-Message-State": "AOJu0Yz6iG+2VxqMFv87egPu5V4FQtKUVxhPPLYYqZsKWxP/E7zT4LeQ\n JC7MQ7xM1haXBVO9pDEY/Ens52CELhS2gBB+wQim07usWo0LxVYMn5n1IvPOr9j6", "X-Gm-Gg": "AeBDievBTuUfTZ86wqM+Zkw8lNsEEJcnHtGs7s4P0K3kM/RfyO3HeKrWfIWTHR5n/lP\n z46jnSS9ZniCN+5bwgn5f+/V7nQU4QC+Uk2ySXpNTSOfFQj8FJ3VTr7vJwSMdRb5fqB6f7KBFat\n Hn2QY2u7AnhQJtPK3CM6pbQZeC4XtX0z5GkHC4L7+Tes/u/DNOibMF1yUjt55eiMQreQCMkX2r0\n /v8DP36BRwfVN2uDDhJMr88f0wHxQw0IA8K7U/yI4HSOgUMte3Cx1T66OhTHbXZyG5VpkAneaow\n JVw6EAHf+pEUcVFL50OQ6iNJ1SNdWkpSZf7K4iVv/5GhjFuXfdVbWdpAGIzIWt45YkayGhRDk+4\n QmJ/fF+oyk2YK0eQI6pKumtm+bOt/wEAALYARe0A1mfhUFM4ymLTPj3Puj+ticCSo3t8BfPXwWK\n XA7rKiAZ9neopa4kucy8UEPoNcMZNdydrb3YRNvuHRW4dz728djBXN", "X-Received": "by 2002:a05:6214:e6c:b0:89a:1888:a1e3 with SMTP id\n 6a1803df08f44-8a7049c73dfmr329086926d6.36.1775609020889;\n Tue, 07 Apr 2026 17:43:40 -0700 (PDT)", "From": "AceLan Kao <acelan.kao@canonical.com>", "To": "kernel-team@lists.ubuntu.com", "Subject": "[SRU][R][PATCH 1/1] wifi: mt76: mt792x: Fix a potential deadlock in\n high-load situations", "Date": "Wed, 8 Apr 2026 08:43:33 +0800", "Message-ID": "<20260408004333.236687-2-acelan.kao@canonical.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260408004333.236687-1-acelan.kao@canonical.com>", "References": "<20260408004333.236687-1-acelan.kao@canonical.com>", "MIME-Version": "1.0", "Received-SPF": "pass client-ip=209.85.219.44; envelope-from=acelan@gmail.com;\n helo=mail-qv1-f44.google.com", "X-BeenThere": "kernel-team@lists.ubuntu.com", "X-Mailman-Version": "2.1.20", "Precedence": "list", "List-Id": "Kernel team discussions <kernel-team.lists.ubuntu.com>", "List-Unsubscribe": "<https://lists.ubuntu.com/mailman/options/kernel-team>,\n <mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe>", "List-Archive": "<https://lists.ubuntu.com/archives/kernel-team>", "List-Post": "<mailto:kernel-team@lists.ubuntu.com>", "List-Help": "<mailto:kernel-team-request@lists.ubuntu.com?subject=help>", "List-Subscribe": "<https://lists.ubuntu.com/mailman/listinfo/kernel-team>,\n <mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe>", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "From: Leon Yen <leon.yen@mediatek.com>\n\nBugLink: https://bugs.launchpad.net/bugs/2137448\n\nA deadlock may occur between two works, ps_work and mac_work, if their work\nfunctions run simultaneously as they attempt to cancel each other by\ncalling cancel_delayed_work_sync().\n\nmt792x_mac_work() -> ... -> cancel_delayed_work_sync(&pm->ps_work);\nmt792x_pm_power_save_work() -> cancel_delayed_work_sync(&mphy->mac_work);\n\nIn high-load situations, they are queued but may not have chance to be\nexecuted until the CPUs are released. Once the CPUs are available, there\nis a high possibility that the ps_work function and mac_work function will\nbe executed simultaneously, resulting in a possible deadlock.\n\nThis patch replaces cancel_delayed_work_sync() with cancel_delayed_work()\nin ps_work to eliminate the deadlock and make the code easier to maintain.\n\nSigned-off-by: Leon Yen <leon.yen@mediatek.com>\nTested-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>\nLink: https://patch.msgid.link/20251215122231.3180648-1-leon.yen@mediatek.com\nSigned-off-by: Felix Fietkau <nbd@nbd.name>\n(cherry picked from commit bb2f07819d063a58756186cac6465341956ac0a4 linux-next)\nSigned-off-by: Chia-Lin Kao (AceLan) <acelan.kao@canonical.com>\n---\n drivers/net/wireless/mediatek/mt76/mt792x_mac.c | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)", "diff": "diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_mac.c b/drivers/net/wireless/mediatek/mt76/mt792x_mac.c\nindex 71dec93094ebd..888e5a5056731 100644\n--- a/drivers/net/wireless/mediatek/mt76/mt792x_mac.c\n+++ b/drivers/net/wireless/mediatek/mt76/mt792x_mac.c\n@@ -375,7 +375,7 @@ void mt792x_pm_power_save_work(struct work_struct *work)\n \t}\n \n \tif (!mt792x_mcu_fw_pmctrl(dev)) {\n-\t\tcancel_delayed_work_sync(&mphy->mac_work);\n+\t\tcancel_delayed_work(&mphy->mac_work);\n \t\treturn;\n \t}\n out:\n", "prefixes": [ "SRU", "R", "1/1" ] }