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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 2C190C4740C for ; Sun, 22 Sep 2019 19:24:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 04786206C2 for ; Sun, 22 Sep 2019 19:24:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569180283; bh=AR8xkLta58mWfwbBEqsTYV291X1xSKFmHu7uqW2tgpM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VK3X/NCcAQ1FmI4najNNmof0wc/ZhmbBgiiWsTT8Ju+zkTv79siLdpg+hI0nsPv7f e7ABVY50q77k2nrm5HeR5OnCWFbSnb0i6K4h9BCRk2/EcNxtDx1zcwsz+L9DdRplCM jvdk681jMwmuZNaFkphH4eI7qqzOt5gU4Fji3e3s= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393004AbfIVSws (ORCPT ); Sun, 22 Sep 2019 14:52:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:51692 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2407937AbfIVSwf (ORCPT ); Sun, 22 Sep 2019 14:52:35 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AD20021D7C; Sun, 22 Sep 2019 18:52:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569178354; bh=AR8xkLta58mWfwbBEqsTYV291X1xSKFmHu7uqW2tgpM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HeUmHv4bcEXDVrYOTnyojgEfUxRb0cdgKrzf/XpRG6xyPd9fyDKTHNnJMfrKApyLQ h4ywZOcIiNOKHqaUorg3c+Syv+r/YEN7Kw5ySAms0fgNI/vPzyu72Gnf5jDI0Z3N+F LbqfywaenC8DW0UklnXYUwTPjkHuAcmONlPQF0cQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Leonard Crestez , Chanwoo Choi , MyungJoo Ham , Sasha Levin , linux-pm@vger.kernel.org Subject: [PATCH AUTOSEL 5.2 110/185] PM / devfreq: passive: Use non-devm notifiers Date: Sun, 22 Sep 2019 14:48:08 -0400 Message-Id: <20190922184924.32534-110-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190922184924.32534-1-sashal@kernel.org> References: <20190922184924.32534-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Leonard Crestez [ Upstream commit 0ef7c7cce43f6ecc2b96d447e69b2900a9655f7c ] The devfreq passive governor registers and unregisters devfreq transition notifiers on DEVFREQ_GOV_START/GOV_STOP using devm wrappers. If devfreq itself is registered with devm then a warning is triggered on rmmod from devm_devfreq_unregister_notifier. Call stack looks like this: devm_devfreq_unregister_notifier+0x30/0x40 devfreq_passive_event_handler+0x4c/0x88 devfreq_remove_device.part.8+0x6c/0x9c devm_devfreq_dev_release+0x18/0x20 release_nodes+0x1b0/0x220 devres_release_all+0x78/0x84 device_release_driver_internal+0x100/0x1c0 driver_detach+0x4c/0x90 bus_remove_driver+0x7c/0xd0 driver_unregister+0x2c/0x58 platform_driver_unregister+0x10/0x18 imx_devfreq_platdrv_exit+0x14/0xd40 [imx_devfreq] This happens because devres_release_all will first remove all the nodes into a separate todo list so the nested devres_release from devm_devfreq_unregister_notifier won't find anything. Fix the warning by calling the non-devm APIS for frequency notification. Using devm wrappers is not actually useful for a governor anyway: it relies on the devfreq core to correctly match the GOV_START/GOV_STOP notifications. Fixes: 996133119f57 ("PM / devfreq: Add new passive governor") Signed-off-by: Leonard Crestez Acked-by: Chanwoo Choi Signed-off-by: MyungJoo Ham Signed-off-by: Sasha Levin --- drivers/devfreq/governor_passive.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/devfreq/governor_passive.c b/drivers/devfreq/governor_passive.c index 58308948b8637..da485477065c5 100644 --- a/drivers/devfreq/governor_passive.c +++ b/drivers/devfreq/governor_passive.c @@ -165,12 +165,12 @@ static int devfreq_passive_event_handler(struct devfreq *devfreq, p_data->this = devfreq; nb->notifier_call = devfreq_passive_notifier_call; - ret = devm_devfreq_register_notifier(dev, parent, nb, + ret = devfreq_register_notifier(parent, nb, DEVFREQ_TRANSITION_NOTIFIER); break; case DEVFREQ_GOV_STOP: - devm_devfreq_unregister_notifier(dev, parent, nb, - DEVFREQ_TRANSITION_NOTIFIER); + WARN_ON(devfreq_unregister_notifier(parent, nb, + DEVFREQ_TRANSITION_NOTIFIER)); break; default: break; -- 2.20.1