From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1433B535FAB; Wed, 23 Sep 2026 14:31:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790173897; cv=none; b=pXyN1wiauhCQpKl3Ts7h2e4gNAn6V6sfBBJ/i8J685zxhup+Q60uIPcehhiJ8NUhQ4wUUYYPnbaS7Gt2DLlOO5XqftchPELzs/D0hsgNit9IjfEI7yu7yZE6cdLnTy0/yMGavGGU6lJ6NTiRgt3XtAWrt484pghxhHTo3pT0RzE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790173897; c=relaxed/simple; bh=LaRF76Ap974aHCSvSeILc/PItMnHvquwkYUD5NK0Vsg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e1um4oWAmKrXWO0zpqzn36CdSM7MELjghjbXjktDJmUyGdbnZuTW4rjK1vpvg7O86ghIe373fnUh47n33mXf6Yr7YK8NTHX4aY5RHYK8TUVXKFxETNcWiyNbYHzfHYyMw31ZsCVc6VlPpfOqyAUHCmXOvaa38Ae2Z/dgCBXq1hs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QddZADm5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QddZADm5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 07DFB1F000FF; Wed, 23 Sep 2026 14:31:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790173895; bh=PtEfR3E8sUG2LnCHn1Gl6PNSpmbQeYRbE3WtUD3AUw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QddZADm5gC2c4re/UhzZcaCi2qKHwaw0W+Eh5zdDESThff6mh3MImLLExiaYqwwr1 tZBIa1g4yeV0rfOhgOJ8WPWvHwtbRxPUL7qGtJBMh8D9xkTL7zz8EN60j4UQ3Nd0vB yus/a4vGuHTEOMZ1UdFotwMEw0IQBRIcG59ZWi58= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tzung-Bi Shih , Guenter Roeck Subject: [PATCH 7.2 379/438] watchdog: rzv2h: Avoid division by zero Date: Wed, 23 Sep 2026 16:06:40 +0200 Message-ID: <20260923140654.689783622@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260923140644.756254324@linuxfoundation.org> References: <20260923140644.756254324@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tzung-Bi Shih commit 6274281c41efa8dd1aa5234c59ad904ff89d7af4 upstream. clk_get_rate() could return 0. Avoid a division by zero panic. Fixes: f6febd0a30b6 ("watchdog: Add Watchdog Timer driver for RZ/V2H(P)") Cc: stable@vger.kernel.org Signed-off-by: Tzung-Bi Shih Link: https://patch.msgid.link/20260913064851.8239-4-tzungbi@kernel.org Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/watchdog/rzv2h_wdt.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/watchdog/rzv2h_wdt.c +++ b/drivers/watchdog/rzv2h_wdt.c @@ -278,6 +278,7 @@ static int rzv2h_wdt_probe(struct platfo struct device *dev = &pdev->dev; struct rzv2h_wdt_priv *priv; struct clk *count_clk; + unsigned long rate; int ret; priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); @@ -314,8 +315,12 @@ static int rzv2h_wdt_probe(struct platfo return dev_err_probe(dev, -EINVAL, "Invalid count source\n"); } + rate = clk_get_rate(count_clk); + if (!rate) + return dev_err_probe(dev, -EINVAL, "Invalid clock rate\n"); + priv->wdev.max_hw_heartbeat_ms = (MILLI * priv->of_data->timeout_cycles * - priv->of_data->cks_div) / clk_get_rate(count_clk); + priv->of_data->cks_div) / rate; dev_dbg(dev, "max hw timeout of %dms\n", priv->wdev.max_hw_heartbeat_ms); ret = devm_pm_runtime_enable(dev);