From patchwork Wed Sep 9 23:53:59 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: 1361125 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=chromium.org header.i=@chromium.org header.a=rsa-sha256 header.s=google header.b=SxkcIkqS; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Bn2Fv5JPkz9sTH for ; Thu, 10 Sep 2020 12:02:27 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728286AbgIJCCS (ORCPT ); Wed, 9 Sep 2020 22:02:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50988 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730111AbgIJBwb (ORCPT ); Wed, 9 Sep 2020 21:52:31 -0400 Received: from mail-pl1-x643.google.com (mail-pl1-x643.google.com [IPv6:2607:f8b0:4864:20::643]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80BD2C06138B for ; Wed, 9 Sep 2020 16:54:09 -0700 (PDT) Received: by mail-pl1-x643.google.com with SMTP id d19so14086pld.0 for ; Wed, 09 Sep 2020 16:54:09 -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=SxkcIkqSWelb6AuUlXuHUzy1a16hhmWXJWuq8Eo/23y2lOyPcWQDUSskXt1hEJUyn6 u1wOiYNDBdX/GAOiEZ/EkYArPHBOHNGFUNcC9AVgOMGKko3iXNgtwmArngx7TwMORv1T Q14fEfQF9K7z06eGlkuJ30cEupLsJdCrymIDQ= 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=av7+VvXj6OWJ4YLQs72VQfhV5ExSzYdmO6jV7Q3e+3ikufFxPdOGu2kqrBo77OqFLp xjU/8LyvB/dOIRcu+Hbn+NW12IXVlnypYUz2oGP21QbrBfa0BxwPM0xwX4BGEj0JqxG+ Bse4PFrDXtup59se1i9rSrtVGzd+4Aqn8nvSr0omxOdgE96sIHyuVa8Y3vAwh8ZikI4I 2AS4t0Fm2sl4Ep62i6xL/aPZv5SCONREJvhtM0h3LMCnqmRWog8H5h/MfTZ1K/W+1wl/ abifmScDP0kZY5XBcMo11ysrgQmU9tUs1Yu2FyLD2n7lzj8Rl/kSas5ArVOeT3t1JUW/ hk4g== X-Gm-Message-State: AOAM53223j1R/ohegRzA0Zrgl75O9BsXXH2pgcBflUozZ3/NBSC/avhz Y4OYduN/yTUZZh3VawMnkJdjfQ== X-Google-Smtp-Source: ABdhPJypCzWo/RzU1A0vkyKGMWGcM+gWL4C+xJq9bpuP3YaGcMPrw6MsySxwiLzgR4TsTQNBxd3ARg== X-Received: by 2002:a17:90a:4ec4:: with SMTP id v4mr2793960pjl.62.1599695646992; Wed, 09 Sep 2020 16:54:06 -0700 (PDT) Received: from apsdesk.mtv.corp.google.com ([2620:15c:202:1:7220:84ff:fe09:2b94]) by smtp.gmail.com with ESMTPSA id h14sm3817937pfe.67.2020.09.09.16.54.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 16:54:06 -0700 (PDT) From: Abhishek Pandit-Subedi To: marcel@holtmann.org, linux-bluetooth@vger.kernel.org Cc: chromeos-bluetooth-upstreaming@chromium.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 16:53:59 -0700 Message-Id: <20200909165317.1.Ie55bb8dde9847e8005f24402f3f2d66ea09cd7b2@changeid> X-Mailer: git-send-email 2.28.0.618.gf4bc123cb7-goog MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@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);