From patchwork Wed Feb 23 16:00:55 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 545553 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 C3677C4332F for ; Wed, 23 Feb 2022 16:01:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235111AbiBWQBg (ORCPT ); Wed, 23 Feb 2022 11:01:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230325AbiBWQBg (ORCPT ); Wed, 23 Feb 2022 11:01:36 -0500 Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 22BD2C3332; Wed, 23 Feb 2022 08:01:08 -0800 (PST) X-IronPort-AV: E=Sophos;i="5.88,391,1635174000"; d="scan'208";a="112139503" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 24 Feb 2022 01:01:07 +0900 Received: from localhost.localdomain (unknown [10.226.93.140]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id D84FB4004923; Thu, 24 Feb 2022 01:01:05 +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 v4 1/6] watchdog: rzg2l_wdt: Fix 32bit overflow issue Date: Wed, 23 Feb 2022 16:00:55 +0000 Message-Id: <20220223160100.23543-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> References: <20220223160100.23543-1-biju.das.jz@bp.renesas.com> 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. This patch also fixes the warning message, 'watchdog: Invalid min and max timeout values, resetting to 0!" Fixes: 2cbc5cd0b55fa2 ("watchdog: Add Watchdog Timer driver for RZ/G2L") Signed-off-by: Biju Das Reviewed-by: Guenter Roeck Reviewed-by: Geert Uytterhoeven --- v3->v4: * Updated commit description. Added Fixes tag v2->v3: * No change 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); }