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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62087C282DD for ; Thu, 23 May 2019 19:50:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 373A22133D for ; Thu, 23 May 2019 19:50:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558641001; bh=kBfZs7uPI92w1cYfqBIww9IeYka4HXTlPEwPA1TB7AQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VqmoaW2VI0m9TwQTX8ohXvRSoVxljOgqU0l+8ByDpvU8IZoAT74FgtZXEZZ2j9QTi lZtWcSb9kBXWEHJqTkcIgtUyL57OBCbNeweHxcJMirJnsZWfL7Xz2pO8UnPw8jbw0M r7lJHVuoU68n1KEK9rIN/crVJM0Shl9guc8XWpRs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388284AbfEWTuA (ORCPT ); Thu, 23 May 2019 15:50:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:43724 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387796AbfEWTKY (ORCPT ); Thu, 23 May 2019 15:10:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D77502184B; Thu, 23 May 2019 19:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558638624; bh=kBfZs7uPI92w1cYfqBIww9IeYka4HXTlPEwPA1TB7AQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kVYf9ETj7UbFGxPVqK5efkKahQ64jZBswQ+RNf4DtnPgtONx/39/tfdgOE3NnmvT1 vmRM7OHVGcak1VXh7Vnz2EC0eKGhkdFYs879WTu97xPc1kvaoqHUOFQL/0jEelX8mQ fdU8klZg62FRYc4prbVJkscPlzwmWTaU6AVdEKFc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrey Smirnov , Chris Healy , linux-pm@vger.kernel.org, Sebastian Reichel , Sasha Levin Subject: [PATCH 4.9 48/53] power: supply: sysfs: prevent endless uevent loop with CONFIG_POWER_SUPPLY_DEBUG Date: Thu, 23 May 2019 21:06:12 +0200 Message-Id: <20190523181718.571354644@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181710.981455400@linuxfoundation.org> References: <20190523181710.981455400@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 349ced9984ff540ce74ca8a0b2e9b03dc434b9dd ] Fix a similar endless event loop as was done in commit 8dcf32175b4e ("i2c: prevent endless uevent loop with CONFIG_I2C_DEBUG_CORE"): The culprit is the dev_dbg printk in the i2c uevent handler. If this is activated (for instance by CONFIG_I2C_DEBUG_CORE) it results in an endless loop with systemd-journald. This happens if user-space scans the system log and reads the uevent file to get information about a newly created device, which seems fair use to me. Unfortunately reading the "uevent" file uses the same function that runs for creating the uevent for a new device, generating the next syslog entry Both CONFIG_I2C_DEBUG_CORE and CONFIG_POWER_SUPPLY_DEBUG were reported in https://bugs.freedesktop.org/show_bug.cgi?id=76886 but only former seems to have been fixed. Drop debug prints as it was done in I2C subsystem to resolve the issue. Signed-off-by: Andrey Smirnov Cc: Chris Healy Cc: linux-pm@vger.kernel.org Signed-off-by: Sebastian Reichel Signed-off-by: Sasha Levin --- drivers/power/supply/power_supply_sysfs.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c index bcde8d13476af..c0fc98e03c912 100644 --- a/drivers/power/supply/power_supply_sysfs.c +++ b/drivers/power/supply/power_supply_sysfs.c @@ -278,15 +278,11 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) char *prop_buf; char *attrname; - dev_dbg(dev, "uevent\n"); - if (!psy || !psy->desc) { dev_dbg(dev, "No power supply yet\n"); return ret; } - dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->desc->name); - ret = add_uevent_var(env, "POWER_SUPPLY_NAME=%s", psy->desc->name); if (ret) return ret; @@ -322,8 +318,6 @@ int power_supply_uevent(struct device *dev, struct kobj_uevent_env *env) goto out; } - dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf); - ret = add_uevent_var(env, "POWER_SUPPLY_%s=%s", attrname, prop_buf); kfree(attrname); if (ret) -- 2.20.1