From mboxrd@z Thu Jan 1 00:00:00 1970 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 AD901C28D13 for ; Thu, 25 Aug 2022 12:23:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241616AbiHYMXB (ORCPT ); Thu, 25 Aug 2022 08:23:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233885AbiHYMW6 (ORCPT ); Thu, 25 Aug 2022 08:22:58 -0400 Received: from mx0b-001ae601.pphosted.com (mx0a-001ae601.pphosted.com [67.231.149.25]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9848DAE9ED for ; Thu, 25 Aug 2022 05:22:57 -0700 (PDT) Received: from pps.filterd (m0077473.ppops.net [127.0.0.1]) by mx0a-001ae601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27P5j0L6027893; Thu, 25 Aug 2022 07:22:44 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cirrus.com; h=from : to : cc : subject : date : message-id : mime-version : content-transfer-encoding : content-type; s=PODMain02222019; bh=CCuFAyZiovrExMERfDLIiYXf9KCPSBvRWYj4Qh4iCWI=; b=n2qwHtVQQmRZXhmfDj4HXAjBTuuVxpJP0nqLsEOiUnfSzD7/YuEvEq0iaWrhqex85Nbn KU3pCbJMNsN4u59jwtIGrfeNXO+CHWwqC0e0WZwxPOSrLQADz7uzu5KajDpLamZ8A58+ 1KViPkML6o1IyY934aUvy9UnZ/drTa7An7b1gA8cw2GUKpmyqLVV0Zu64lulr5RkwDEJ j0lrPU0ToDUGfAgETarp1hSE7PV7dvxZGiFapjcB1ZDwhhT8/wG9vlre4SLU8Rm+x0OE kh8kX4WRji6mrdmhcB2VdvpNMSF4E73U97RMFFkIINnObgfX1VwlXB2i7QOD95iAreSp NA== Received: from ediex02.ad.cirrus.com ([84.19.233.68]) by mx0a-001ae601.pphosted.com (PPS) with ESMTPS id 3j4dgmbu3q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 25 Aug 2022 07:22:43 -0500 Received: from ediex01.ad.cirrus.com (198.61.84.80) by ediex02.ad.cirrus.com (198.61.84.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.9; Thu, 25 Aug 2022 07:22:41 -0500 Received: from ediswmail.ad.cirrus.com (198.61.86.93) by ediex01.ad.cirrus.com (198.61.84.80) with Microsoft SMTP Server id 15.2.1118.9 via Frontend Transport; Thu, 25 Aug 2022 07:22:41 -0500 Received: from edi-sw-dsktp-006.ad.cirrus.com (edi-sw-dsktp-006.ad.cirrus.com [198.90.251.95]) by ediswmail.ad.cirrus.com (Postfix) with ESMTP id 87C0A45D; Thu, 25 Aug 2022 12:22:41 +0000 (UTC) From: Richard Fitzgerald To: , , , CC: , , , Richard Fitzgerald Subject: [PATCH 0/3] soundwire: Fixes for spurious and missing UNATTACH Date: Thu, 25 Aug 2022 13:22:38 +0100 Message-ID: <20220825122241.273090-1-rf@opensource.cirrus.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Proofpoint-ORIG-GUID: PZHXXUkqqiQPa5ZAvhvNqKoIVYP3RT6F X-Proofpoint-GUID: PZHXXUkqqiQPa5ZAvhvNqKoIVYP3RT6F X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The bus and cadence code has several bugs that cause UNATTACH notifications to either be sent spuriously or to be missed. These can be seen occasionally with a single peripheral on the bus, but are much more frequent with multiple peripherals, where several peripherals could change state and report in consecutive PINGs. The root of all of these bugs seems to be a code design flaw that assumed every PING status change would be handled separately. However, PINGs are handled by a workqueue function and there is no guarantee when that function will be scheduled to run or how much CPU time it will receive. PINGs will continue while the work function is handling a snapshot of a previous PING so the code must take account that (a) status could change during the work function and (b) there can be a backlog of changes before the IRQ work function runs again. Richard Fitzgerald (2): soundwire: bus: Don't lose unattach notifications soundwire: bus: Fix lost UNATTACH when re-enumerating Simon Trimmer (1): soundwire: cadence: fix updating slave status when a bus has multiple peripherals drivers/soundwire/bus.c | 44 +++++++++++++++------ drivers/soundwire/cadence_master.c | 63 +++++++++++++----------------- 2 files changed, 59 insertions(+), 48 deletions(-) -- 2.30.2