From patchwork Mon Aug 12 20:08:52 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Smirnov X-Patchwork-Id: 11090791 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 299C8112C for ; Mon, 12 Aug 2019 20:09:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1B9E72856F for ; Mon, 12 Aug 2019 20:09:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0FF0B2857E; Mon, 12 Aug 2019 20:09:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DC1DC2857B for ; Mon, 12 Aug 2019 20:09:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727705AbfHLUJa (ORCPT ); Mon, 12 Aug 2019 16:09:30 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:34123 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727704AbfHLUJ3 (ORCPT ); Mon, 12 Aug 2019 16:09:29 -0400 Received: by mail-pg1-f193.google.com with SMTP id n9so43814246pgc.1; Mon, 12 Aug 2019 13:09:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ijw8qW4YQwPJ65cSa1rqyHCWE36jFTySRyvLwWFgnQw=; b=tfJUFeWwhrmS4h1pq6sO+GDBArYE2TxoBPuPasju9ZIokfBWp+RqY7yiJpEonO763q BuwB3RdLjAkdnctdf7S+fVh8IIuGDTszipW+SA2J5TZRbwObD8KWt5uq00fXmC9ITrCE LWh5VGEQHgqOG+kNU8MFkQABga9OuxTk6ZSmvKm19rFz8nbzCa1j+x/hS6O0+S+hml3j 9xuo5kcLORk9U7/09L32nOwiIFKc/hkp0aRrTdjDpDaF4MRJwC78qRegrYpHHcUAXIw8 rK27jkx1uYtD5GAMe0l2ARB851cSlc+lkwAvl8HycMgXS2g3eoC/Zo1ekVCqV5WGFvwP LxFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ijw8qW4YQwPJ65cSa1rqyHCWE36jFTySRyvLwWFgnQw=; b=K00gghbCQG8GSckpZqb1+kncCZ323ykK0iGFYOkVipfZWbAEfc1yA5CDp45inzo/f3 kqpVI8pVdeI5ql0AQJDVp0vr0AuR14qhC+kw+U+W21HxXf0TM5EvCJI+m+67y4qpbnm7 bE/XqMgcV+C8Ofqcg7Vbd/ilNY6KjT0Xzz2QRkIosg103dhtZQ2o1vOHcA1EKxPjtG74 IsQmh2cvuV+3SY0JufPKinBGsTzAAsl4riRGtHsqMYum0SJcm3AnvM39dhUA0svPEWK2 PxxBvt5dN3vhmk9L3c0Lf2vYtgnbJzPhHbT0SsWpwrF5h/TkDdP+RbQSbUNVSnayim/J pBgQ== X-Gm-Message-State: APjAAAUibfBVaBdinp62CBm5VHF3dY8soPnbpBs+IqD7l/DhInruw2aD fN8Mdynk3DSB6dQKEcb2SQZR74JJ X-Google-Smtp-Source: APXvYqzpdprAf4PgfPstdReQJX4BUhcgUUiPmhjuiohTicqwFGMjLLlYEvn3FKN5Q5Xkz3s5c23+hA== X-Received: by 2002:aa7:91ca:: with SMTP id z10mr14091512pfa.30.1565640568726; Mon, 12 Aug 2019 13:09:28 -0700 (PDT) Received: from localhost.lan (c-67-185-54-80.hsd1.wa.comcast.net. [67.185.54.80]) by smtp.gmail.com with ESMTPSA id n26sm110286451pfa.83.2019.08.12.13.09.27 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 12 Aug 2019 13:09:28 -0700 (PDT) From: Andrey Smirnov To: linux-watchdog@vger.kernel.org Cc: Andrey Smirnov , Chris Healy , Guenter Roeck , Rick Ramstetter , linux-kernel@vger.kernel.org Subject: [PATCH v2 08/22] watchdog: ziirave_wdt: Skip zeros when calculating checksum Date: Mon, 12 Aug 2019 13:08:52 -0700 Message-Id: <20190812200906.31344-9-andrew.smirnov@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190812200906.31344-1-andrew.smirnov@gmail.com> References: <20190812200906.31344-1-andrew.smirnov@gmail.com> MIME-Version: 1.0 Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Zeros don't contribute anything to checksum value, so we can skip unused portion of the packet when calculating its checksum. Signed-off-by: Andrey Smirnov Cc: Chris Healy Cc: Guenter Roeck Cc: Rick Ramstetter Cc: linux-watchdog@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Guenter Roeck --- drivers/watchdog/ziirave_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/watchdog/ziirave_wdt.c b/drivers/watchdog/ziirave_wdt.c index 9d9c669b8b47..19da0910c2d1 100644 --- a/drivers/watchdog/ziirave_wdt.c +++ b/drivers/watchdog/ziirave_wdt.c @@ -271,7 +271,7 @@ static int __ziirave_firm_write_pkt(struct watchdog_device *wdd, memcpy(packet + 3, data, len); /* Packet checksum */ - for (i = 0; i < ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1; i++) + for (i = 0; i < len + 3; i++) checksum += packet[i]; packet[ZIIRAVE_FIRM_PKT_TOTAL_SIZE - 1] = checksum;