From patchwork Fri Aug 23 03:43:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Zhang X-Patchwork-Id: 821850 Received: from mail-m3299.qiye.163.com (mail-m3299.qiye.163.com [220.197.32.99]) (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 5810538DCD; Fri, 23 Aug 2024 15:32:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.99 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724427139; cv=none; b=gCm9cPEFqypORUT0FeDlFP78nPhiCAVFcLDkG0KYKIqHuOF2t9mjODFDStyiPP+A0XRMUUCkLCPhl9smwb5Djaw8b7mnf3v4Qaze7qYTdBiyvuhSHfNK0zW4w28fIG5z3RcyO4EM7CUPkmJuaW3ievmnUOCdnsre4fTI3AlcYlQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724427139; c=relaxed/simple; bh=rQii0oBq5qomxiuAfZ9W2LcD4mFuZolUuTeRd2nMWV8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=MFovFPs7gzelrFF01TJuGiZDE1SK4krvMY1q/y3t7yJQkO2wRVIflgDRhdVKjkamINBmb+9x9TpY5f3j7ffZ2R6zYL6UpoPK1d4YybETHxoroCnsCpY22AejziclyvmBDpiMZtHLLTLJJ8AxwXzfkAZOIYSDJabTsvi8RWixM2E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rock-chips.com; spf=pass smtp.mailfrom=rock-chips.com; dkim=pass (1024-bit key) header.d=rock-chips.com header.i=@rock-chips.com header.b=PG0X56dX; arc=none smtp.client-ip=220.197.32.99 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rock-chips.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rock-chips.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=rock-chips.com header.i=@rock-chips.com header.b="PG0X56dX" DKIM-Signature: a=rsa-sha256; b=PG0X56dX9eS7NjdXgLPOYU0ccjHLv3nwxAItYxLTOFxjR6cOYun4xYfG/hM7dJBLMuXH+eTNZ6fyYCL7JM8tfi6aLTBPoa2nDMzd6hcmaVRNkNZJaocLX2/yZ0zmVK4jKBNSnNj6fOv8S936safpH+ZnsuRgqstXXHVadwkg1Z0=; s=default; c=relaxed/relaxed; d=rock-chips.com; v=1; bh=LWcU6RysEIzIJ6pAz/3hn/zvAsi9B5aKaEc9SGRcJtw=; h=date:mime-version:subject:message-id:from; Received: from rockchip.. (unknown [58.22.7.114]) by smtp.qiye.163.com (Hmail) with ESMTPA id 769137E0207; Fri, 23 Aug 2024 11:44:58 +0800 (CST) From: Ye Zhang To: linus.walleij@linaro.org, brgl@bgdev.pl, heiko@sntech.de, linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, tao.huang@rock-chips.com, finley.xiao@rock-chips.com, tim.chen@rock-chips.com, elaine.zhang@rock-chips.com, Ye Zhang Subject: [PATCH v2] gpio: rockchip: avoid division by zero Date: Fri, 23 Aug 2024 11:43:04 +0800 Message-Id: <20240823034314.62305-2-ye.zhang@rock-chips.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240823034314.62305-1-ye.zhang@rock-chips.com> References: <20240823034314.62305-1-ye.zhang@rock-chips.com> Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFDSUNOT01LS0k3V1ktWUFJV1kPCRoVCBIfWUFZGUgdSlZLHk9NH01MQkJPTx5WFRQJFh oXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0tIVUpLSUhCSE NVSktLVUpCS0tZBg++ X-HM-Tid: 0a917d56633709cfkunm769137e0207 X-HM-MType: 1 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6ODI6Gjo5KjI3MCxCTjYpTg0p ChQKCT5VSlVKTElPSENPTUJCTEpMVTMWGhIXVQIeVQETGhUcOwkUGBBWGBMSCwhVGBQWRVlXWRIL WUFZTkNVSUlVTFVKSk9ZV1kIAVlBSUhDSTcG If the clk_get_rate return '0', it will happen division by zero. Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller") Signed-off-by: Ye Zhang Reviewed-by: Heiko Stuebner --- drivers/gpio/gpio-rockchip.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c index 0bd339813110..712258224eb3 100644 --- a/drivers/gpio/gpio-rockchip.c +++ b/drivers/gpio/gpio-rockchip.c @@ -207,6 +207,8 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) { div_debounce_support = true; freq = clk_get_rate(bank->db_clk); + if (!freq) + return -EINVAL; max_debounce = (GENMASK(23, 0) + 1) * 2 * 1000000 / freq; if (debounce > max_debounce) return -EINVAL;