From patchwork Wed Nov 6 07:01:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 11229439 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 027B915AB for ; Wed, 6 Nov 2019 07:04:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D47CA21872 for ; Wed, 6 Nov 2019 07:03:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731712AbfKFHDz (ORCPT ); Wed, 6 Nov 2019 02:03:55 -0500 Received: from esa2.mentor.iphmx.com ([68.232.141.98]:9055 "EHLO esa2.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731709AbfKFHDz (ORCPT ); Wed, 6 Nov 2019 02:03:55 -0500 IronPort-SDR: pxkYdO2ElJF+nddIDEtBjSp78R57KIyN+Jwu1RS1h24ERArbk0NMi3kOXgN6xTkLhayG9uCo6e yOfjU42NwT5UYfCYcBfRAspb/GXT6NgXl3pOh3HsbLyza8BkPm9M22oWgolL6kkpaHXG43KGwD H/t+8buxd/SBo3vH6KS1exQF4H0bGzf6fVm5m1WvKuYhXBYWrPrFhIAGaLNRB1OHH7TkmkIK3Z AaB89IgKVZt3lecpMoeYXIu7s3kZ6b46w4BNlKVVt9tPeCGKnE6RJqkHNMpVk/q6uJnIa2f9jN oUA= X-IronPort-AV: E=Sophos;i="5.68,272,1569312000"; d="scan'208";a="42848300" Received: from orw-gwy-01-in.mentorg.com ([192.94.38.165]) by esa2.mentor.iphmx.com with ESMTP; 05 Nov 2019 23:03:54 -0800 IronPort-SDR: O7M+BwzV4jsGblTL4oMEcB/tCztlAtqDwvUyWrnyIzJD8vfyvmDdqla4S9l6/kJVj+NRiayRDW KSDMupJha6cKriXLbEp2wIL5K29YAWcvQCQq9DjUjpX3r0Fy8TKNsXAANaugxQyjIZOcmdPlEa maYdngbhkzh1etIEN/QKdTD58Cq3tyDPp+YNEWIoUPgrzyw8kNzxsmHKZ97oRP36efQEHHrLY8 4w0PAypZF6px7bFZFNLzGMvifU1mSj69O2NgROY3DADvgZTEgcqRiqW1yRVnuDbv5dJT0+o4aD IBM= From: Jiada Wang To: , , , , CC: , , , , Subject: [PATCH v5 32/48] Input: atmel_mxt_ts - rely on calculated_crc rather than file config_crc Date: Wed, 6 Nov 2019 16:01:30 +0900 Message-ID: <20191106070146.18759-33-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191106070146.18759-1-jiada_wang@mentor.com> References: <20191106070146.18759-1-jiada_wang@mentor.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Kautuk Consul We now prefer to rely on the calculated CRC and not on the CRC stored in the file. The new logic is as follows: 1) stored CRC of file != calculated CRC of file, then refuse the possible corrupted file 2) calculated CRC of file != CRC of configuration in controller, then update configuration in controller 3) calculated CRC of file == CRC of configuration in controller, then ignore configuration file Signed-off-by: Kautuk Consul Signed-off-by: George G. Davis Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 65 +++++++++++++----------- 1 file changed, 36 insertions(+), 29 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index acbba44d604c..3513413158c3 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -1908,7 +1908,7 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw) int ret; int offset; int i; - u32 info_crc, config_crc, calculated_crc; + u32 info_crc, config_crc, calculated_crc = 0; u16 crc_start = 0; /* Make zero terminated copy of the OBP_RAW file */ @@ -1971,30 +1971,6 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw) } cfg.raw_pos += offset; - /* - * The Info Block CRC is calculated over mxt_info and the object - * table. If it does not match then we are trying to load the - * configuration from a different chip or firmware version, so - * the configuration CRC is invalid anyway. - */ - if (info_crc == data->info_crc) { - if (config_crc == 0 || data->config_crc == 0) { - dev_info(dev, "CRC zero, attempting to apply config\n"); - } else if (config_crc == data->config_crc) { - dev_dbg(dev, "Config CRC 0x%06X: OK\n", - data->config_crc); - ret = 0; - goto release_raw; - } else { - dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n", - data->config_crc, config_crc); - } - } else { - dev_warn(dev, - "Warning: Info CRC error - device=0x%06X file=0x%06X\n", - data->info_crc, info_crc); - } - /* Malloc memory to store configuration */ cfg.start_ofs = MXT_OBJECT_START + data->info->object_num * sizeof(struct mxt_object) + @@ -2018,14 +1994,45 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw) else dev_warn(dev, "Could not find CRC start\n"); - if (crc_start > cfg.start_ofs) { + if (crc_start > cfg.start_ofs) calculated_crc = mxt_calculate_crc(cfg.mem, crc_start - cfg.start_ofs, cfg.mem_size); - if (config_crc > 0 && config_crc != calculated_crc) - dev_warn(dev, "Config CRC in file inconsistent, calculated=%06X, file=%06X\n", - calculated_crc, config_crc); + /* If the CRC stored in the file is not the same as what + * was calculated by mxt_calculate_crc, this means we + * have to refuse the config file and abort download. + */ + if (config_crc != calculated_crc) { + dev_warn(dev, + "Config CRC in file inconsistent, calculated=%06X, file=%06X\n", + calculated_crc, config_crc); + ret = 0; + goto release_mem; + } + + /* + * The Info Block CRC is calculated over mxt_info and the object + * table. If it does not match then we are trying to load the + * configuration from a different chip or firmware version, so + * the configuration CRC is invalid anyway. + */ + if (info_crc == data->info_crc) { + if (config_crc == 0 || data->config_crc == 0) { + dev_info(dev, "CRC zero, attempting to apply config\n"); + } else if (config_crc == data->config_crc) { + dev_dbg(dev, "Config CRC 0x%06X: OK\n", + data->config_crc); + ret = 0; + goto release_mem; + } else { + dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n", + data->config_crc, config_crc); + } + } else { + dev_warn(dev, + "Warning: Info CRC error - device=0x%06X file=0x%06X\n", + data->info_crc, info_crc); } ret = mxt_upload_cfg_mem(data, &cfg);