From patchwork Fri Jul 1 06:16:44 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "D. Starke" X-Patchwork-Id: 586510 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 CC070C433EF for ; Fri, 1 Jul 2022 06:18:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234670AbiGAGSm (ORCPT ); Fri, 1 Jul 2022 02:18:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234703AbiGAGSk (ORCPT ); Fri, 1 Jul 2022 02:18:40 -0400 Received: from mta-64-228.siemens.flowmailer.net (mta-64-228.siemens.flowmailer.net [185.136.64.228]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F60724F03 for ; Thu, 30 Jun 2022 23:18:37 -0700 (PDT) Received: by mta-64-228.siemens.flowmailer.net with ESMTPSA id 20220701061834264116a2c2f3dcebc8 for ; Fri, 01 Jul 2022 08:18:35 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=daniel.starke@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc; bh=msVhtJ7MhssN0SWIJ0WUSajK2zecw41Np+Pj8Y3EcwI=; b=K30eoq9odHaBy7lhanVzkJnVVODLBI+02jEl+OX3eVdLfnpxWJTGIwxi1AdTAZcGpAeba2 ZStPtZotkjnm8jvD4qCi+Us8DSSpL7yywD34Yt2Bnfi50GyhmPefn22NUufOIWAtrkLl3hmg Q9uxmXApvuofeNL9S2O3D8bvIOCOM=; From: "D. Starke" To: linux-serial@vger.kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org Cc: linux-kernel@vger.kernel.org, Daniel Starke Subject: [PATCH v4 1/9] tty: n_gsm: fix user open not possible at responder until initiator open Date: Fri, 1 Jul 2022 08:16:44 +0200 Message-Id: <20220701061652.39604-1-daniel.starke@siemens.com> MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-314044:519-21489:flowmailer Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Daniel Starke After setting up the control channel on both sides the responder side may want to open a virtual tty to listen on until the initiator starts an application on a user channel. The current implementation allows the open() but no other operation, like termios. These fail with EINVAL. The responder sided application has no means to detect an open by the initiator sided application this way. And the initiator sided applications usually expect the responder sided application to listen on the user channel upon open. Set the user channel into half-open state on responder side once a user application opens the virtual tty to allow IO operations on it. Furthermore, keep the user channel constipated until the initiator side opens it to give the responder sided application the chance to detect the new connection and to avoid data loss if the responder sided application starts sending before the user channel is open. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Signed-off-by: Daniel Starke --- drivers/tty/n_gsm.c | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) Stable backport remark has been removed compared to v3. No other changes applied. Link: https://lore.kernel.org/all/20220530144512.2731-1-daniel.starke@siemens.com/ diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index fd8b86dde525..63314fe5e43b 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1493,6 +1493,8 @@ static void gsm_dlci_close(struct gsm_dlci *dlci) if (debug & 8) pr_debug("DLCI %d goes closed.\n", dlci->addr); dlci->state = DLCI_CLOSED; + /* Prevent us from sending data before the link is up again */ + dlci->constipated = true; if (dlci->addr != 0) { tty_port_tty_hangup(&dlci->port, false); spin_lock_irqsave(&dlci->lock, flags); @@ -1522,6 +1524,7 @@ static void gsm_dlci_open(struct gsm_dlci *dlci) del_timer(&dlci->t1); /* This will let a tty open continue */ dlci->state = DLCI_OPEN; + dlci->constipated = false; if (debug & 8) pr_debug("DLCI %d goes open.\n", dlci->addr); /* Send current modem state */ @@ -1602,6 +1605,25 @@ static void gsm_dlci_begin_open(struct gsm_dlci *dlci) mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100); } +/** + * gsm_dlci_set_opening - change state to opening + * @dlci: DLCI to open + * + * Change internal state to wait for DLCI open from initiator side. + * We set off timers and responses upon reception of an SABM. + */ +static void gsm_dlci_set_opening(struct gsm_dlci *dlci) +{ + switch (dlci->state) { + case DLCI_CLOSED: + case DLCI_CLOSING: + dlci->state = DLCI_OPENING; + break; + default: + break; + } +} + /** * gsm_dlci_begin_close - start channel open procedure * @dlci: DLCI to open @@ -1745,10 +1767,13 @@ static struct gsm_dlci *gsm_dlci_alloc(struct gsm_mux *gsm, int addr) dlci->addr = addr; dlci->adaption = gsm->adaption; dlci->state = DLCI_CLOSED; - if (addr) + if (addr) { dlci->data = gsm_dlci_data; - else + /* Prevent us from sending data before the link is up */ + dlci->constipated = true; + } else { dlci->data = gsm_dlci_command; + } gsm->dlci[addr] = dlci; return dlci; } @@ -3163,6 +3188,8 @@ static int gsmtty_open(struct tty_struct *tty, struct file *filp) /* Start sending off SABM messages */ if (gsm->initiator) gsm_dlci_begin_open(dlci); + else + gsm_dlci_set_opening(dlci); /* And wait for virtual carrier */ return tty_port_block_til_ready(port, tty, filp); }