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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AE7BBC433DF for ; Mon, 24 Aug 2020 14:06:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 98FE2214F1 for ; Mon, 24 Aug 2020 14:06:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727066AbgHXOGm (ORCPT ); Mon, 24 Aug 2020 10:06:42 -0400 Received: from mga07.intel.com ([134.134.136.100]:37576 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725780AbgHXOGk (ORCPT ); Mon, 24 Aug 2020 10:06:40 -0400 IronPort-SDR: a76nrZMX8q/VMZ5InxF4Xb7ZcyNtsDVbaKdBcZcJJD5mUcj3LPex07kzO280VJjTRmsvt9JLgT rvV9ocQPAblQ== X-IronPort-AV: E=McAfee;i="6000,8403,9722"; a="220172282" X-IronPort-AV: E=Sophos;i="5.76,348,1592895600"; d="scan'208";a="220172282" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 07:06:39 -0700 IronPort-SDR: UBR208y2ztdF68uc9x4G9cEXpxmIXaqhRHB9iWgBhRLQTwUz19Vli6EmcDgV967+6uowTFo/es Ydleu/4Usebg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,348,1592895600"; d="scan'208";a="402362192" Received: from lahna.fi.intel.com (HELO lahna) ([10.237.72.163]) by fmsmga001.fm.intel.com with SMTP; 24 Aug 2020 07:06:36 -0700 Received: by lahna (sSMTP sendmail emulation); Mon, 24 Aug 2020 17:06:35 +0300 Date: Mon, 24 Aug 2020 17:06:35 +0300 From: Mika Westerberg To: "Rafael J. Wysocki" Cc: Linux ACPI , LKML , "Krogerus, Heikki" , "Kenneth R. Crudup" Subject: Re: [PATCH] ACPI: OSL: Prevent acpi_release_memory() from returning too early Message-ID: <20200824140635.GN1375436@lahna.fi.intel.com> References: <6142241.0H6QnnlUA7@kreacher> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6142241.0H6QnnlUA7@kreacher> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org On Fri, Aug 21, 2020 at 07:42:55PM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki > > After commit 1757659d022b ("ACPI: OSL: Implement deferred unmapping > of ACPI memory") in some cases acpi_release_memory() may return > before the target memory mappings actually go away, because they > are released asynchronously now. > > Prevent it from returning prematurely by making it wait for the next > RCU grace period to elapse, for all of the RCU callbacks to complete > and for all of the scheduled work items to be flushed before > returning. > > Fixes: 1757659d022b ("ACPI: OSL: Implement deferred unmapping of ACPI memory") > Reported-by: Kenneth R. Crudup > Signed-off-by: Rafael J. Wysocki Reviewed-by: Mika Westerberg