From patchwork Mon Dec 13 15:26:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 12674101 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 6674EC433FE for ; Mon, 13 Dec 2021 15:27:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240083AbhLMP1G (ORCPT ); Mon, 13 Dec 2021 10:27:06 -0500 Received: from relmlor2.renesas.com ([210.160.252.172]:59115 "EHLO relmlie6.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S240079AbhLMP1F (ORCPT ); Mon, 13 Dec 2021 10:27:05 -0500 X-IronPort-AV: E=Sophos;i="5.88,202,1635174000"; d="scan'208";a="103767722" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 14 Dec 2021 00:27:03 +0900 Received: from localhost.localdomain (unknown [10.226.92.170]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 6762D4008C53; Tue, 14 Dec 2021 00:27:01 +0900 (JST) From: Biju Das To: Wim Van Sebroeck , Guenter Roeck Cc: Biju Das , linux-watchdog@vger.kernel.org, Geert Uytterhoeven , Chris Paterson , Biju Das , Prabhakar Mahadev Lad , linux-renesas-soc@vger.kernel.org Subject: [PATCH v2 1/4] watchdog: rzg2l_wdt: Fix 32bit overflow issue Date: Mon, 13 Dec 2021 15:26:55 +0000 Message-Id: <20211213152658.26225-1-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org The value of timer_cycle_us can be 0 due to 32bit overflow. For eg:- If we assign the counter value "0xfff" for computing maxval. This patch fixes this issue by appending ULL to 1024, so that it is promoted to 64bit. Signed-off-by: Biju Das Reviewed-by: Guenter Roeck Reviewed-by: Geert Uytterhoeven --- V1->V2: * Added Rb tag from Guenter and Geert. --- drivers/watchdog/rzg2l_wdt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 6b426df34fd6..96f2a018ab62 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -53,7 +53,7 @@ static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv) static u32 rzg2l_wdt_get_cycle_usec(unsigned long cycle, u32 wdttime) { - u64 timer_cycle_us = 1024 * 1024 * (wdttime + 1) * MICRO; + u64 timer_cycle_us = 1024 * 1024ULL * (wdttime + 1) * MICRO; return div64_ul(timer_cycle_us, cycle); }