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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 0E882C7112A for ; Sun, 14 Oct 2018 15:46:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D4BEA20645 for ; Sun, 14 Oct 2018 15:46:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D4BEA20645 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 S1729284AbeJNX2T (ORCPT ); Sun, 14 Oct 2018 19:28:19 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:37241 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728125AbeJNX2T (ORCPT ); Sun, 14 Oct 2018 19:28:19 -0400 Received: from [2a02:8011:400e:2:cbab:f00:c93f:614] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1gBiLx-0004cj-Ef; Sun, 14 Oct 2018 16:30:49 +0100 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gBiLU-0000Oo-Gp; Sun, 14 Oct 2018 16:30:20 +0100 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, "Sebastian Ott" , "Martin Schwidefsky" , "Peter Oberparleiter" Date: Sun, 14 Oct 2018 16:25:41 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 191/366] s390/cio: update chpid descriptor after resource accessibility event In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:cbab:f00:c93f:614 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 3.16.60-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Ott commit af2e460ade0b0180d0f3812ca4f4f59cc9597f3e upstream. Channel path descriptors have been seen as something stable (as long as the chpid is configured). Recent tests have shown that the descriptor can also be altered when the link state of a channel path changes. Thus it is necessary to update the descriptor during handling of resource accessibility events. Signed-off-by: Sebastian Ott Reviewed-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky Signed-off-by: Ben Hutchings --- drivers/s390/cio/chsc.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -362,6 +362,7 @@ static void chsc_process_sei_link_incide static void chsc_process_sei_res_acc(struct chsc_sei_nt0_area *sei_area) { + struct channel_path *chp; struct chp_link link; struct chp_id chpid; int status; @@ -374,10 +375,17 @@ static void chsc_process_sei_res_acc(str chpid.id = sei_area->rsid; /* allocate a new channel path structure, if needed */ status = chp_get_status(chpid); - if (status < 0) - chp_new(chpid); - else if (!status) + if (!status) return; + + if (status < 0) { + chp_new(chpid); + } else { + chp = chpid_to_chp(chpid); + mutex_lock(&chp->lock); + chp_update_desc(chp); + mutex_unlock(&chp->lock); + } memset(&link, 0, sizeof(struct chp_link)); link.chpid = chpid; if ((sei_area->vf & 0xc0) != 0) {