From patchwork Thu Sep 10 01:40:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abhishek Pandit-Subedi X-Patchwork-Id: 11766415 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 86244139F for ; Thu, 10 Sep 2020 02:47:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64E0621D80 for ; Thu, 10 Sep 2020 02:47:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="b0zJlrJ3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730411AbgIJCAZ (ORCPT ); Wed, 9 Sep 2020 22:00:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729521AbgIJBk6 (ORCPT ); Wed, 9 Sep 2020 21:40:58 -0400 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EBE9C061344 for ; Wed, 9 Sep 2020 18:40:58 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id u13so3380400pgh.1 for ; Wed, 09 Sep 2020 18:40:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=gTez5zBL4O/mFCX1yAYIY6uoJGixvvecrhH5yeefCRU=; b=b0zJlrJ3/FxkSGhXn87cvP+RTMUhelRrCM1riW4kT7+txcP800FsUvP6kSl1Tx+BQ9 nlnSbaIdcJf/ctfzMo8lklWjGAlMfBcz670pLHXNIAzEyKNqQRUVeGBFLUGnDrDQvmmo LiL1peql9jifg/8mL5CDMgP9HFRyzTX8uyAco= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=gTez5zBL4O/mFCX1yAYIY6uoJGixvvecrhH5yeefCRU=; b=EDhYX+8QyW/IqGScP2neKGWshOUoYtFVcd/QLnynfu0FFPgJo51p/VHUeU/XTBe+07 9dKGvo+yy3fuJ0qf/jB3ls5dedcfZX8oERz8ivuWXBUaeRZgRDu5dv8u5MBDeXwm8dAh u7uiWo9LpHp9TjAUqbs7PLg3/+e7SLebUq+20Nq7572YltfY44kT6/yUn+vrW7xuseGb mxHWZCjOPGu6fEtqWmXkh+vMEnGX0wS0oh1/z60+2BcdXhWyonJrZ2BqSjOaNzhgIKsZ I9Q9XwhaOuDLaFRBeCs13PtGsU1Nms+v1dZc/mqf4wdA96whncHSIW31YPYeY4zPnedm ZzJw== X-Gm-Message-State: AOAM531f2QmpfrkA7KUG1qfWbAo1zUQJqoxuPmlajqcXRQjvKd/nBzTY j74x25QEwlC84nAAv+BZMJIah6r3QzH8CA== X-Google-Smtp-Source: ABdhPJzBPsq3OhqI1wKePrmNY399SC3c/Mj0s1LcqZge53ktq1ymQHWKSBttbMamebJGRQYDAMFBPA== X-Received: by 2002:a63:d25:: with SMTP id c37mr2501235pgl.403.1599702057352; Wed, 09 Sep 2020 18:40:57 -0700 (PDT) Received: from apsdesk.mtv.corp.google.com ([2620:15c:202:1:7220:84ff:fe09:2b94]) by smtp.gmail.com with ESMTPSA id j19sm3885366pfi.51.2020.09.09.18.40.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 18:40:56 -0700 (PDT) From: Abhishek Pandit-Subedi To: linux-bluetooth@vger.kernel.org Cc: marcel@holtmann.org, Abhishek Pandit-Subedi , "David S. Miller" , Johan Hedberg , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Jakub Kicinski Subject: [PATCH] Bluetooth: Re-order clearing suspend tasks Date: Wed, 9 Sep 2020 18:40:06 -0700 Message-Id: <20200909183952.1.Ie55bb8dde9847e8005f24402f3f2d66ea09cd7b2@changeid> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog MIME-Version: 1.0 Sender: linux-bluetooth-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Unregister_pm_notifier is a blocking call so suspend tasks should be cleared beforehand. Otherwise, the notifier will wait for completion before returning (and we encounter a 2s timeout on resume). Fixes: 0e9952804ec9c8 (Bluetooth: Clear suspend tasks on unregister) Signed-off-by: Abhishek Pandit-Subedi --- Should have caught that unregister_pm_notifier was blocking last time but when testing the earlier patch, I got unlucky and saw that the error message was never hit (the suspend timeout). When re-testing this patch on the same device, I was able to reproduce the problem on an older build with the 0e9952804ec9c8 but not on a newer build with the same patch. Changing the order correctly fixes it everywhere. Confirmed this by adding debug logs in btusb_disconnect and hci_suspend_notifier to confirm what order things were getting called. Sorry about the churn. Next I'm going try to do something about the palm shaped indentation on my forehead... net/bluetooth/hci_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index efc0fe2b47dac2..be9cdf5dabe5dc 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -3794,8 +3794,8 @@ void hci_unregister_dev(struct hci_dev *hdev) cancel_work_sync(&hdev->power_on); - unregister_pm_notifier(&hdev->suspend_notifier); hci_suspend_clear_tasks(hdev); + unregister_pm_notifier(&hdev->suspend_notifier); cancel_work_sync(&hdev->suspend_prepare); hci_dev_do_close(hdev);