From patchwork Thu Sep 8 14:28:35 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Quentin Schulz X-Patchwork-Id: 75805 Delivered-To: patch@linaro.org Received: by 10.140.106.11 with SMTP id d11csp876725qgf; Thu, 8 Sep 2016 07:30:05 -0700 (PDT) X-Received: by 10.66.152.238 with SMTP id vb14mr26849075pab.78.1473345005793; Thu, 08 Sep 2016 07:30:05 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id vq2si47351352pab.111.2016.09.08.07.30.05; Thu, 08 Sep 2016 07:30:05 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966247AbcIHO33 (ORCPT + 27 others); Thu, 8 Sep 2016 10:29:29 -0400 Received: from down.free-electrons.com ([37.187.137.238]:59511 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966123AbcIHO3Y (ORCPT ); Thu, 8 Sep 2016 10:29:24 -0400 Received: by mail.free-electrons.com (Postfix, from userid 110) id B29081D6; Thu, 8 Sep 2016 16:29:21 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT shortcircuit=ham autolearn=disabled version=3.4.0 Received: from quentin-Latitude-E6320.home (LStLambert-657-1-97-87.w90-63.abo.wanadoo.fr [90.63.216.87]) by mail.free-electrons.com (Postfix) with ESMTPSA id 41A7E1DD0; Thu, 8 Sep 2016 16:29:11 +0200 (CEST) From: Quentin Schulz To: jdelvare@suse.com, linux@roeck-us.net, jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, maxime.ripard@free-electrons.com, wens@csie.org, lee.jones@linaro.org Cc: Quentin Schulz , thomas.petazzoni@free-electrons.com, antoine.tenart@free-electrons.com, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 1/3] hwmon: iio_hwmon: defer probe when no channel is found Date: Thu, 8 Sep 2016 16:28:35 +0200 Message-Id: <1473344917-1524-2-git-send-email-quentin.schulz@free-electrons.com> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1473344917-1524-1-git-send-email-quentin.schulz@free-electrons.com> References: <1473344917-1524-1-git-send-email-quentin.schulz@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org iio_channel_get_all returns -ENODEV when it cannot find either phandles and properties in the Device Tree or channels whose consumer_dev_name matches iio_hwmon in iio_map_list. The iio_map_list is filled in by iio drivers which might be probed after iio_hwmon. It is better to defer the probe of iio_hwmon if such error is returned by iio_channel_get_all in order to let a chance to iio drivers to expose channels in iio_map_list. Signed-off-by: Quentin Schulz --- v5: - patch re-inserted, v3: - patch removed, drivers/hwmon/iio_hwmon.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) -- 2.5.0 diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c index b550ba5..c0da4d9 100644 --- a/drivers/hwmon/iio_hwmon.c +++ b/drivers/hwmon/iio_hwmon.c @@ -73,8 +73,11 @@ static int iio_hwmon_probe(struct platform_device *pdev) name = dev->of_node->name; channels = iio_channel_get_all(dev); - if (IS_ERR(channels)) + if (IS_ERR(channels)) { + if (PTR_ERR(channels) == -ENODEV) + return -EPROBE_DEFER; return PTR_ERR(channels); + } st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL); if (st == NULL) {