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,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 4D82AC3B1A1 for ; Fri, 14 Feb 2020 16:38:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2070724676 for ; Fri, 14 Feb 2020 16:38:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581698307; bh=OjlB9AVcPer6GvN/IsZeDID4gRoeRc0i8+HUSWT00wc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aOrwI9bzzKhyqIo/ruUhoXN0aODuOX50bU/c9H2HNPj+R1E6hzS1OnEnm3dfc1Vox iAjRFXuXsp6ZfzixAial9Gbc/lC6iv2dIw5v5vsvh9o4zhion+ee4wTmEBApeburqe 7mh1FYafd4ecJcpSh+afhP+6y1qhpG5e1pJS0w3o= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393382AbgBNQi0 (ORCPT ); Fri, 14 Feb 2020 11:38:26 -0500 Received: from mail.kernel.org ([198.145.29.99]:59950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405672AbgBNQXf (ORCPT ); Fri, 14 Feb 2020 11:23:35 -0500 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 18C3D2477D; Fri, 14 Feb 2020 16:23:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697414; bh=OjlB9AVcPer6GvN/IsZeDID4gRoeRc0i8+HUSWT00wc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l0fIVzRwbiFySQ1Er1Yi87HSW8RuSFNjsNdVzpEhmsE6x5rlQpExda1oUNr/sfWF9 BqwnJz+KGadwVpR23BUUbzpRaguosKwa4BNfC/J/vE6wRNYTlgGtnFP5hVQh5IS2xq 5kzl0Br4Odh2kMcf3zRcwS8YLG+05A7NBzf7C6oU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Thierry Reding , Sasha Levin , linux-pwm@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 105/141] pwm: omap-dmtimer: Remove PWM chip in .remove before making it unfunctional Date: Fri, 14 Feb 2020 11:20:45 -0500 Message-Id: <20200214162122.19794-105-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162122.19794-1-sashal@kernel.org> References: <20200214162122.19794-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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: Uwe Kleine-König [ Upstream commit 43efdc8f0e6d7088ec61bd55a73bf853f002d043 ] In the old code (e.g.) mutex_destroy() was called before pwmchip_remove(). Between these two calls it is possible that a PWM callback is used which tries to grab the mutex. Fixes: 6604c6556db9 ("pwm: Add PWM driver for OMAP using dual-mode timers") Signed-off-by: Uwe Kleine-König Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin --- drivers/pwm/pwm-omap-dmtimer.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index 5ad42f33e70c1..2e15acf13893d 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -337,6 +337,11 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev) static int pwm_omap_dmtimer_remove(struct platform_device *pdev) { struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev); + int ret; + + ret = pwmchip_remove(&omap->chip); + if (ret) + return ret; if (pm_runtime_active(&omap->dm_timer_pdev->dev)) omap->pdata->stop(omap->dm_timer); @@ -345,7 +350,7 @@ static int pwm_omap_dmtimer_remove(struct platform_device *pdev) mutex_destroy(&omap->mutex); - return pwmchip_remove(&omap->chip); + return 0; } static const struct of_device_id pwm_omap_dmtimer_of_match[] = { -- 2.20.1