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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 B39A7C433E0 for ; Thu, 18 Jun 2020 01:35:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87B7E20776 for ; Thu, 18 Jun 2020 01:35:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592444119; bh=09rvWbk8Ky7fR1yr6TY6KKhEpOIbZH4kf4XvocKd1Mg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=uVm3lTeafDtDwsd10AmTInEatdG6M8rF2+/0Kt+1XPj+eJaIcM1dGh/s9TNzWc+v8 Si4N0/OvPwSqT5uCNKn2rSbXbEtFXKB6E5K0k7njRsei/D+OxRbtzm1VFCNHq3yxiw wEpTlgnx3aGPU8XLXVtFxBn40HtL65Rxu88vohvA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732833AbgFRBbt (ORCPT ); Wed, 17 Jun 2020 21:31:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:38628 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732276AbgFRB3T (ORCPT ); Wed, 17 Jun 2020 21:29:19 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3D4BA22228; Thu, 18 Jun 2020 01:29:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592443758; bh=09rvWbk8Ky7fR1yr6TY6KKhEpOIbZH4kf4XvocKd1Mg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZhQATq2BZ3emqNDAGASfAbV4LztzT8HeDuYDNZQf9+Q/ZdCXQj80yuAPE64z76pIw f6CDCqRcejAXPKkfYYnIHEG/tkdcqaNmz1PnRS20cjJYfRDpAYHDAub27X+7DGgAJx 359kU3FiBl7BT3vK06bdUrktFs9aAHQpnQF5xPZY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Gregory CLEMENT , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH AUTOSEL 4.9 45/80] tty: n_gsm: Fix SOF skipping Date: Wed, 17 Jun 2020 21:27:44 -0400 Message-Id: <20200618012819.609778-45-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200618012819.609778-1-sashal@kernel.org> References: <20200618012819.609778-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gregory CLEMENT [ Upstream commit 84d6f81c1fb58b56eba81ff0a36cf31946064b40 ] For at least some modems like the TELIT LE910, skipping SOF makes transfers blocking indefinitely after a short amount of data transferred. Given the small improvement provided by skipping the SOF (just one byte on about 100 bytes), it seems better to completely remove this "feature" than make it optional. Fixes: e1eaea46bb40 ("tty: n_gsm line discipline") Signed-off-by: Gregory CLEMENT Link: https://lore.kernel.org/r/20200512115323.1447922-3-gregory.clement@bootlin.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/n_gsm.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 9e9016e67843..d5efacd27b15 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -685,7 +685,6 @@ static void gsm_data_kick(struct gsm_mux *gsm) { struct gsm_msg *msg, *nmsg; int len; - int skip_sof = 0; list_for_each_entry_safe(msg, nmsg, &gsm->tx_list, list) { if (gsm->constipated && msg->addr) @@ -707,15 +706,10 @@ static void gsm_data_kick(struct gsm_mux *gsm) print_hex_dump_bytes("gsm_data_kick: ", DUMP_PREFIX_OFFSET, gsm->txframe, len); - - if (gsm->output(gsm, gsm->txframe + skip_sof, - len - skip_sof) < 0) + if (gsm->output(gsm, gsm->txframe, len) < 0) break; /* FIXME: Can eliminate one SOF in many more cases */ gsm->tx_bytes -= msg->len; - /* For a burst of frames skip the extra SOF within the - burst */ - skip_sof = 1; list_del(&msg->list); kfree(msg); -- 2.25.1