From mboxrd@z Thu Jan 1 00:00:00 1970 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 5F46BC433EF for ; Mon, 13 Jun 2022 14:13:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381695AbiFMONQ (ORCPT ); Mon, 13 Jun 2022 10:13:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1382375AbiFMOFr (ORCPT ); Mon, 13 Jun 2022 10:05:47 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F5769549B; Mon, 13 Jun 2022 04:40:43 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 3D139B80D31; Mon, 13 Jun 2022 11:40:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F2C4C341C4; Mon, 13 Jun 2022 11:40:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1655120435; bh=+lNjLZLQbeY+zNTSRXU8Q/ga2ssIT8vG9WFJSp3ZJkM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S2669vE5t15iXhzwQfyeHWIcaiQq9/RWmM9FIfBhdg7nFYA5ZNUcTD7Slg7DSnlqF oamrm9yinlb85z+grtvq+WJFcjz9bQlNwFsFFjlG+wJaNNuRMAIyxGXmDiD7EihVBw CDNlC/9nDyZsiGPprkrHVi892OphKZlNuBNxHY+M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miaoqian Lin , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.17 031/298] iio: proximity: vl53l0x: Fix return value check of wait_for_completion_timeout Date: Mon, 13 Jun 2022 12:08:45 +0200 Message-Id: <20220613094925.875386367@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220613094924.913340374@linuxfoundation.org> References: <20220613094924.913340374@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Miaoqian Lin [ Upstream commit 50f2959113cb6756ffd73c4fedc712cf2661f711 ] wait_for_completion_timeout() returns unsigned long not int. It returns 0 if timed out, and positive if completed. The check for <= 0 is ambiguous and should be == 0 here indicating timeout which is the only error case. Fixes: 3cef2e31b54b ("iio: proximity: vl53l0x: Add IRQ support") Signed-off-by: Miaoqian Lin Link: https://lore.kernel.org/r/20220412064210.10734-1-linmq006@gmail.com Signed-off-by: Jonathan Cameron Signed-off-by: Sasha Levin --- drivers/iio/proximity/vl53l0x-i2c.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/iio/proximity/vl53l0x-i2c.c b/drivers/iio/proximity/vl53l0x-i2c.c index cf38144b6f95..13a87d3e3544 100644 --- a/drivers/iio/proximity/vl53l0x-i2c.c +++ b/drivers/iio/proximity/vl53l0x-i2c.c @@ -104,6 +104,7 @@ static int vl53l0x_read_proximity(struct vl53l0x_data *data, u16 tries = 20; u8 buffer[12]; int ret; + unsigned long time_left; ret = i2c_smbus_write_byte_data(client, VL_REG_SYSRANGE_START, 1); if (ret < 0) @@ -112,10 +113,8 @@ static int vl53l0x_read_proximity(struct vl53l0x_data *data, if (data->client->irq) { reinit_completion(&data->completion); - ret = wait_for_completion_timeout(&data->completion, HZ/10); - if (ret < 0) - return ret; - else if (ret == 0) + time_left = wait_for_completion_timeout(&data->completion, HZ/10); + if (time_left == 0) return -ETIMEDOUT; vl53l0x_clear_irq(data); -- 2.35.1