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 E8759C433FE for ; Tue, 3 May 2022 13:34:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231777AbiECNh5 (ORCPT ); Tue, 3 May 2022 09:37:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233488AbiECNh4 (ORCPT ); Tue, 3 May 2022 09:37:56 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 33ABD338BD for ; Tue, 3 May 2022 06:34:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C480E61741 for ; Tue, 3 May 2022 13:34:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18384C385A9; Tue, 3 May 2022 13:34:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1651584863; bh=LqZsvsHRgSit3RDITwNyrOIYxxDt3gLKsUNkbK/cXcw=; h=Subject:To:Cc:From:Date:From; b=SNpzFvVgiyj03JfW2McR1nsIG3dzdS3bQf76i9O7SSjbscJnnjNsxD6PDa7Fj2PT7 ASNmc48MNm10fYX+OmJKEroVebvqM7H9N7aDIijA3CPsLQrIqp+Etury/yK0SJgo1B 162DtwcrPwR05Gb3knLB04lPWrEGETDgsqYm1hkw= Subject: FAILED: patch "[PATCH] tty: n_gsm: fix wrong DLCI release order" failed to apply to 4.19-stable tree To: daniel.starke@siemens.com, gregkh@linuxfoundation.org Cc: From: Date: Tue, 03 May 2022 15:34:21 +0200 Message-ID: <165158486187232@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From deefc58bafb4841df7f0a0d85d89a1c819db9743 Mon Sep 17 00:00:00 2001 From: Daniel Starke Date: Thu, 14 Apr 2022 02:42:14 -0700 Subject: [PATCH] tty: n_gsm: fix wrong DLCI release order The current DLCI release order starts with the control channel followed by the user channels. Reverse this order to keep the control channel open until all user channels have been released. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke Link: https://lore.kernel.org/r/20220414094225.4527-9-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index cc90b03ce005..6b953dfbb155 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2146,8 +2146,8 @@ static void gsm_cleanup_mux(struct gsm_mux *gsm, bool disc) /* Finish outstanding timers, making sure they are done */ del_timer_sync(&gsm->t2_timer); - /* Free up any link layer users */ - for (i = 0; i < NUM_DLCI; i++) + /* Free up any link layer users and finally the control channel */ + for (i = NUM_DLCI - 1; i >= 0; i--) if (gsm->dlci[i]) gsm_dlci_release(gsm->dlci[i]); mutex_unlock(&gsm->mutex);