From patchwork Fri Aug 23 03:43:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ye Zhang X-Patchwork-Id: 821851 Received: from mail-m3288.qiye.163.com (mail-m3288.qiye.163.com [220.197.32.88]) (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 CEA6816BE14; Fri, 23 Aug 2024 13:12:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.88 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724418748; cv=none; b=qOAHWIijxVwYptq6T70za4rN+TK6EyhnpgOny/HWwcM9slxCgBXdcrCbukd/z/uxLHJPolsQDf+WYyf3hEM8Eqm4TvMLmdZEBK50gVLOAuyrByc5ZdVSC2vllMKWYNtEY8pie+lOQfa9le79o1tfCVlVhN57yytH/WG/cdRuxvI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724418748; c=relaxed/simple; bh=1VfQbjWS+6z2mD0CQrtZvs5NWWR86HhjlnQAFqhZ9Tw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Vv2plvnQyuKJYzD59TM4Cg+r4wsWcqNftkLqJ/ROyZBnX+DyCkXN+DtcvIJPpp7iEQH9ORnPpSmmvyuFUaBnCDZplTT8OkM/cFVKfZzUZh/u3i1hNCP80zffbKVz8B6unVZ9TDy7VJD0laLfG+YywsP+QQ6AGtlgm8N/fbCbXZs= 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=jiTn11vt; arc=none smtp.client-ip=220.197.32.88 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="jiTn11vt" DKIM-Signature: a=rsa-sha256; b=jiTn11vtYuDeWdB68667tgi9pyyqszmnApIkCNbVnsqAk4SxE9WfnEP9itMvgfhuO4lxjpYN86CzGINoICX16MLvxRY1OPz6NOtY10C6HmKPngLd+rp5Q5SNrwCcM8tcZu6CbyTLV7vCnhUeRI+BTjWLEFzupkmMl7d/1XVbHU8=; s=default; c=relaxed/relaxed; d=rock-chips.com; v=1; bh=AludWvTyCsSnun1czF/Np2s2IMxYrPapHyVaGwssSEk=; 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 7A1507E03D5; Fri, 23 Aug 2024 11:45:02 +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: resolve underflow issue Date: Fri, 23 Aug 2024 11:43:07 +0800 Message-Id: <20240823034314.62305-5-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 tZV1koWUFDSUNOT01LS0k3V1ktWUFJV1kPCRoVCBIfWUFZGkJMTVZJTk4YTE1KQ0lPT0NWFRQJFh oXVRMBExYaEhckFA4PWVdZGBILWUFZTkNVSUlVTFVKSk9ZV1kWGg8SFR0UWUFZT0tIVUpLSUhCSE NVSktLVUpCS0tZBg++ X-HM-Tid: 0a917d5672e609cfkunm7a1507e03d5 X-HM-MType: 1 X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6MSo6HTo5FjI4KCxRCTYIThAO LhIKCzlVSlVKTElPSENPTEtITElNVTMWGhIXVQIeVQETGhUcOwkUGBBWGBMSCwhVGBQWRVlXWRIL WUFZTkNVSUlVTFVKSk9ZV1kIAVlBSUxOTTcG div_reg may be < 0 if debounce is zero, causing the unsigned int to overflow. Fixes: 3bcbd1a85b68 ("gpio/rockchip: support next version gpio controller") Signed-off-by: Ye Zhang --- drivers/gpio/gpio-rockchip.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c index bf22b103b6a2..c3a87d075908 100644 --- a/drivers/gpio/gpio-rockchip.c +++ b/drivers/gpio/gpio-rockchip.c @@ -204,8 +204,8 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, unsigned int cur_div_reg; u64 div; - if (bank->gpio_type == GPIO_TYPE_V2 && !IS_ERR(bank->db_clk)) { - div_debounce_support = true; + div_debounce_support = (bank->gpio_type == GPIO_TYPE_V2) && !IS_ERR(bank->db_clk); + if (debounce && div_debounce_support) { freq = clk_get_rate(bank->db_clk); if (!freq) return -EINVAL; @@ -216,8 +216,6 @@ static int rockchip_gpio_set_debounce(struct gpio_chip *gc, div = (u64)debounce * freq; div_reg = DIV_ROUND_CLOSEST_ULL(div, 2 * USEC_PER_SEC) - 1; - } else { - div_debounce_support = false; } raw_spin_lock_irqsave(&bank->slock, flags);