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[2620:137:e000::1:20]) by mx.google.com with ESMTP id e8-20020a170902744800b001a966042af8si7971125plt.341.2023.05.24.05.33.42; Wed, 24 May 2023 05:33:54 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232790AbjEXMWa (ORCPT + 99 others); Wed, 24 May 2023 08:22:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46624 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230491AbjEXMWZ (ORCPT ); Wed, 24 May 2023 08:22:25 -0400 Received: from laurent.telenet-ops.be (laurent.telenet-ops.be [IPv6:2a02:1800:110:4::f00:19]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E56199 for ; Wed, 24 May 2023 05:22:22 -0700 (PDT) Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed30:59b9:3473:f0ae:e2b7]) by laurent.telenet-ops.be with bizsmtp id 0cNL2A00D5NiV2701cNLTf; Wed, 24 May 2023 14:22:20 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtp (Exim 4.95) (envelope-from ) id 1q1nVF-002xwB-BN; Wed, 24 May 2023 14:22:20 +0200 Received: from geert by rox.of.borg with local (Exim 4.95) (envelope-from ) id 1q1nVU-00DPCD-Ci; Wed, 24 May 2023 14:22:20 +0200 From: Geert Uytterhoeven To: Liam Girdwood , Mark Brown , Osama Muhammad Cc: linux-kernel@vger.kernel.org, Geert Uytterhoeven Subject: [PATCH v2 2/2] regulator: core: Streamline debugfs operations Date: Wed, 24 May 2023 14:22:18 +0200 Message-Id: X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766778874266370176?= X-GMAIL-MSGID: =?utf-8?q?1766778874266370176?= If CONFIG_DEBUG_FS is not set: regulator: Failed to create debugfs directory ... regulator-dummy: Failed to create debugfs directory As per the comments for debugfs_create_dir(), errors returned by this function should be expected, and ignored: * If debugfs is not enabled in the kernel, the value -%ENODEV will be * returned. * * NOTE: it's expected that most callers should _ignore_ the errors returned * by this function. Other debugfs functions handle the fact that the "dentry" * passed to them could be an error and they don't crash in that case. * Drivers should generally work fine even if debugfs fails to init anyway. Adhere to the debugfs spirit, and streamline all operations by: 1. Demoting the importance of the printed error messages to debug level, like is already done in create_regulator(), 2. Further ignoring any returned errors, as by design, all debugfs functions are no-ops when passed an error pointer. Fixes: 2bf1c45be3b8f3a3 ("regulator: Fix error checking for debugfs_create_dir") Signed-off-by: Geert Uytterhoeven --- v2: - Spin off error check fix into a separate patch, - Improve rationale. --- drivers/regulator/core.c | 28 ++++++++++++---------------- 1 file changed, 12 insertions(+), 16 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index ad8baf65f63e369b..d8e1caaf207e108f 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1913,17 +1913,15 @@ static struct regulator *create_regulator(struct regulator_dev *rdev, regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs); if (IS_ERR(regulator->debugfs)) rdev_dbg(rdev, "Failed to create debugfs directory\n"); - } else { - debugfs_create_u32("uA_load", 0444, regulator->debugfs, - ®ulator->uA_load); - debugfs_create_u32("min_uV", 0444, regulator->debugfs, - ®ulator->voltage[PM_SUSPEND_ON].min_uV); - debugfs_create_u32("max_uV", 0444, regulator->debugfs, - ®ulator->voltage[PM_SUSPEND_ON].max_uV); - debugfs_create_file("constraint_flags", 0444, - regulator->debugfs, regulator, - &constraint_flags_fops); - } + + debugfs_create_u32("uA_load", 0444, regulator->debugfs, + ®ulator->uA_load); + debugfs_create_u32("min_uV", 0444, regulator->debugfs, + ®ulator->voltage[PM_SUSPEND_ON].min_uV); + debugfs_create_u32("max_uV", 0444, regulator->debugfs, + ®ulator->voltage[PM_SUSPEND_ON].max_uV); + debugfs_create_file("constraint_flags", 0444, regulator->debugfs, + regulator, &constraint_flags_fops); /* * Check now if the regulator is an always on regulator - if @@ -5256,10 +5254,8 @@ static void rdev_init_debugfs(struct regulator_dev *rdev) } rdev->debugfs = debugfs_create_dir(rname, debugfs_root); - if (IS_ERR(rdev->debugfs)) { - rdev_warn(rdev, "Failed to create debugfs directory\n"); - return; - } + if (IS_ERR(rdev->debugfs)) + rdev_dbg(rdev, "Failed to create debugfs directory\n"); debugfs_create_u32("use_count", 0444, rdev->debugfs, &rdev->use_count); @@ -6179,7 +6175,7 @@ static int __init regulator_init(void) debugfs_root = debugfs_create_dir("regulator", NULL); if (IS_ERR(debugfs_root)) - pr_warn("regulator: Failed to create debugfs directory\n"); + pr_debug("regulator: Failed to create debugfs directory\n"); #ifdef CONFIG_DEBUG_FS debugfs_create_file("supply_map", 0444, debugfs_root, NULL,