From patchwork Thu Aug 20 09:19:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 265276 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 0172CC433E3 for ; Thu, 20 Aug 2020 13:48:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C1A33208DB for ; Thu, 20 Aug 2020 13:48:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597931335; bh=RHqDz9lR5Du0csNXTtFqx68ndUQQKIhitffvzRzCYBU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=YzYxiFM6KSLGM1tsdgRLjKBNVZl68Bic5HUBCvCvZxALCw3mJ/DTPONSH1Gt8cCVB zTCyepc91odhGMhHTaaBnkCT0rQxbeXI8uTVxf4A5jEqM8JI9leJEZGWQ2YcA4vuxH FaLQHUicmmDa9BsIIDjt7dknp8IciXiJtNwWi58o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730476AbgHTNjf (ORCPT ); Thu, 20 Aug 2020 09:39:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:39866 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728123AbgHTJ3x (ORCPT ); Thu, 20 Aug 2020 05:29:53 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1FD3022B4B; Thu, 20 Aug 2020 09:29:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597915792; bh=RHqDz9lR5Du0csNXTtFqx68ndUQQKIhitffvzRzCYBU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zo4u9rx9hUT/+xzctkRzv3wCb9AuXY5maTh6791hz4bUhCUgZJWbj8gGMhcXX1uqg esKLEa2Kw+yTKlQWaMNsOq9FMBpteU0m6q61XyKnGhtBAImqnFm/JnjWv30K6Wad1r 7umMh6SROeocxkPKO+VUU+xzEZjFQoVK0d2xZReU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Sasha Levin Subject: [PATCH 5.8 136/232] USB: serial: ftdi_sio: clean up receive processing Date: Thu, 20 Aug 2020 11:19:47 +0200 Message-Id: <20200820091619.410965526@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091612.692383444@linuxfoundation.org> References: <20200820091612.692383444@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold [ Upstream commit ce054039ba5e47b75a3be02a00274e52b06a6456 ] Clean up receive processing by dropping the character pointer and keeping the length argument unchanged throughout the function. Also make it more apparent that sysrq processing can consume a characters by adding an explicit continue. Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Sasha Levin --- drivers/usb/serial/ftdi_sio.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 96b9e2768ac5c..33f1cca7eaa61 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -2483,7 +2483,6 @@ static int ftdi_process_packet(struct usb_serial_port *port, struct ftdi_private *priv, unsigned char *buf, int len) { unsigned char status; - unsigned char *ch; int i; char flag; @@ -2526,8 +2525,7 @@ static int ftdi_process_packet(struct usb_serial_port *port, else priv->transmit_empty = 0; - len -= 2; - if (!len) + if (len == 2) return 0; /* status only */ /* @@ -2556,19 +2554,20 @@ static int ftdi_process_packet(struct usb_serial_port *port, } } - port->icount.rx += len; - ch = buf + 2; + port->icount.rx += len - 2; if (port->port.console && port->sysrq) { - for (i = 0; i < len; i++, ch++) { - if (!usb_serial_handle_sysrq_char(port, *ch)) - tty_insert_flip_char(&port->port, *ch, flag); + for (i = 2; i < len; i++) { + if (usb_serial_handle_sysrq_char(port, buf[i])) + continue; + tty_insert_flip_char(&port->port, buf[i], flag); } } else { - tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len); + tty_insert_flip_string_fixed_flag(&port->port, buf + 2, flag, + len - 2); } - return len; + return len - 2; } static void ftdi_process_read_urb(struct urb *urb)