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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 2EF30C43441 for ; Sun, 11 Nov 2018 20:04:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F03C520869 for ; Sun, 11 Nov 2018 20:04:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F03C520869 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=decadent.org.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731147AbeKLFyL (ORCPT ); Mon, 12 Nov 2018 00:54:11 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:51708 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726508AbeKLFyJ (ORCPT ); Mon, 12 Nov 2018 00:54:09 -0500 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gLvtD-0000l4-Ky; Sun, 11 Nov 2018 19:59:23 +0000 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gLvsO-0001Og-Bk; Sun, 11 Nov 2018 19:58:32 +0000 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Michael Ellerman" , "Mahesh Salgaonkar" Date: Sun, 11 Nov 2018 19:49:05 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 033/366] powerpc/fadump: Unregister fadump on kexec down path. In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.61-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Mahesh Salgaonkar commit 722cde76d68e8cc4f3de42e71c82fd40dea4f7b9 upstream. Unregister fadump on kexec down path otherwise the fadump registration in new kexec-ed kernel complains that fadump is already registered. This makes new kernel to continue using fadump registered by previous kernel which may lead to invalid vmcore generation. Hence this patch fixes this issue by un-registering fadump in fadump_cleanup() which is called during kexec path so that new kernel can register fadump with new valid values. Fixes: b500afff11f6 ("fadump: Invalidate registration and release reserved memory for general use.") Signed-off-by: Mahesh Salgaonkar Signed-off-by: Michael Ellerman Signed-off-by: Ben Hutchings --- arch/powerpc/kernel/fadump.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -1025,6 +1025,9 @@ void fadump_cleanup(void) init_fadump_mem_struct(&fdm, fdm_active->cpu_state_data.destination_address); fadump_invalidate_dump(&fdm); + } else if (fw_dump.dump_registered) { + /* Un-register Firmware-assisted dump if it was registered. */ + fadump_unregister_dump(&fdm); } }