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 B7B4FC2BA83 for ; Fri, 14 Feb 2020 16:09:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86D942468A for ; Fri, 14 Feb 2020 16:09:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696576; bh=/kSJUdQ1ahCq/N2iGkEHHNNjI4ZS98H5v/xzEyM8kXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=soeYad9zL5rYUXC0uz/9Lt0PYiEgBFpE0doBKmaO2DBZ/ndbhk6mzmOefg292AAYm br/Z8v+e7t8yySoxqQL/vshW89kaw1LYXhJUpl24bOhCwoq/GqAwQOUP/4UW6fJgJw ya9/uJhPYgjUXkLtPGW6QED5o7b4fmYmoNt3GGT4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390725AbgBNQJe (ORCPT ); Fri, 14 Feb 2020 11:09:34 -0500 Received: from mail.kernel.org ([198.145.29.99]:33684 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391238AbgBNQJU (ORCPT ); Fri, 14 Feb 2020 11:09:20 -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 D88DD24686; Fri, 14 Feb 2020 16:09:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581696559; bh=/kSJUdQ1ahCq/N2iGkEHHNNjI4ZS98H5v/xzEyM8kXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iFvqjUp727u8y/g4JIyq6U2JRwjkwVII3DDknEjUocBLTgBXaAqjebzc9rN85opZ3 YlJiOY2LkVRMeB3TLKdRYHDfQjVLcDuuhnTv5wvrtVFwqBmPPeHl4DOfrvTyWFBCgb uLja1xXz2NqE4EuMAaTX2Dd5ZXJo0Ko2wSolORoQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Enric Balletbo i Serra , Douglas Anderson , Mark Brown , Sasha Levin Subject: [PATCH AUTOSEL 5.4 350/459] regulator: vctrl-regulator: Avoid deadlock getting and setting the voltage Date: Fri, 14 Feb 2020 11:00:00 -0500 Message-Id: <20200214160149.11681-350-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214160149.11681-1-sashal@kernel.org> References: <20200214160149.11681-1-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: Enric Balletbo i Serra [ Upstream commit e9153311491da9d9863ead9888a1613531cb4a1b ] `cat /sys/kernel/debug/regulator/regulator_summary` ends on a deadlock when you have a voltage controlled regulator (vctrl). The problem is that the vctrl_get_voltage() and vctrl_set_voltage() calls the regulator_get_voltage() and regulator_set_voltage() and that will try to lock again the dependent regulators (the regulator supplying the control voltage). Fix the issue by exporting the unlocked version of the regulator_get_voltage() and regulator_set_voltage() API so drivers that need it, like the voltage controlled regulator driver can use it. Fixes: f8702f9e4aa7 ("regulator: core: Use ww_mutex for regulators locking") Reported-by: Douglas Anderson Signed-off-by: Enric Balletbo i Serra Link: https://lore.kernel.org/r/20200116094543.2847321-1-enric.balletbo@collabora.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/core.c | 2 ++ drivers/regulator/vctrl-regulator.c | 38 +++++++++++++++++------------ 2 files changed, 25 insertions(+), 15 deletions(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 1dba0bdf37623..c6fa0f4451aeb 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -3462,6 +3462,7 @@ int regulator_set_voltage_rdev(struct regulator_dev *rdev, int min_uV, out: return ret; } +EXPORT_SYMBOL(regulator_set_voltage_rdev); static int regulator_limit_voltage_step(struct regulator_dev *rdev, int *current_uV, int *min_uV) @@ -4026,6 +4027,7 @@ int regulator_get_voltage_rdev(struct regulator_dev *rdev) return ret; return ret - rdev->constraints->uV_offset; } +EXPORT_SYMBOL(regulator_get_voltage_rdev); /** * regulator_get_voltage - get regulator output voltage diff --git a/drivers/regulator/vctrl-regulator.c b/drivers/regulator/vctrl-regulator.c index 9a9ee81881098..cbadb1c996790 100644 --- a/drivers/regulator/vctrl-regulator.c +++ b/drivers/regulator/vctrl-regulator.c @@ -11,10 +11,13 @@ #include #include #include +#include #include #include #include +#include "internal.h" + struct vctrl_voltage_range { int min_uV; int max_uV; @@ -79,7 +82,7 @@ static int vctrl_calc_output_voltage(struct vctrl_data *vctrl, int ctrl_uV) static int vctrl_get_voltage(struct regulator_dev *rdev) { struct vctrl_data *vctrl = rdev_get_drvdata(rdev); - int ctrl_uV = regulator_get_voltage(vctrl->ctrl_reg); + int ctrl_uV = regulator_get_voltage_rdev(vctrl->ctrl_reg->rdev); return vctrl_calc_output_voltage(vctrl, ctrl_uV); } @@ -90,16 +93,16 @@ static int vctrl_set_voltage(struct regulator_dev *rdev, { struct vctrl_data *vctrl = rdev_get_drvdata(rdev); struct regulator *ctrl_reg = vctrl->ctrl_reg; - int orig_ctrl_uV = regulator_get_voltage(ctrl_reg); + int orig_ctrl_uV = regulator_get_voltage_rdev(ctrl_reg->rdev); int uV = vctrl_calc_output_voltage(vctrl, orig_ctrl_uV); int ret; if (req_min_uV >= uV || !vctrl->ovp_threshold) /* voltage rising or no OVP */ - return regulator_set_voltage( - ctrl_reg, + return regulator_set_voltage_rdev(ctrl_reg->rdev, vctrl_calc_ctrl_voltage(vctrl, req_min_uV), - vctrl_calc_ctrl_voltage(vctrl, req_max_uV)); + vctrl_calc_ctrl_voltage(vctrl, req_max_uV), + PM_SUSPEND_ON); while (uV > req_min_uV) { int max_drop_uV = (uV * vctrl->ovp_threshold) / 100; @@ -114,9 +117,10 @@ static int vctrl_set_voltage(struct regulator_dev *rdev, next_uV = max_t(int, req_min_uV, uV - max_drop_uV); next_ctrl_uV = vctrl_calc_ctrl_voltage(vctrl, next_uV); - ret = regulator_set_voltage(ctrl_reg, + ret = regulator_set_voltage_rdev(ctrl_reg->rdev, + next_ctrl_uV, next_ctrl_uV, - next_ctrl_uV); + PM_SUSPEND_ON); if (ret) goto err; @@ -130,7 +134,8 @@ static int vctrl_set_voltage(struct regulator_dev *rdev, err: /* Try to go back to original voltage */ - regulator_set_voltage(ctrl_reg, orig_ctrl_uV, orig_ctrl_uV); + regulator_set_voltage_rdev(ctrl_reg->rdev, orig_ctrl_uV, orig_ctrl_uV, + PM_SUSPEND_ON); return ret; } @@ -155,9 +160,10 @@ static int vctrl_set_voltage_sel(struct regulator_dev *rdev, if (selector >= vctrl->sel || !vctrl->ovp_threshold) { /* voltage rising or no OVP */ - ret = regulator_set_voltage(ctrl_reg, + ret = regulator_set_voltage_rdev(ctrl_reg->rdev, + vctrl->vtable[selector].ctrl, vctrl->vtable[selector].ctrl, - vctrl->vtable[selector].ctrl); + PM_SUSPEND_ON); if (!ret) vctrl->sel = selector; @@ -173,9 +179,10 @@ static int vctrl_set_voltage_sel(struct regulator_dev *rdev, else next_sel = vctrl->vtable[vctrl->sel].ovp_min_sel; - ret = regulator_set_voltage(ctrl_reg, + ret = regulator_set_voltage_rdev(ctrl_reg->rdev, vctrl->vtable[next_sel].ctrl, - vctrl->vtable[next_sel].ctrl); + vctrl->vtable[next_sel].ctrl, + PM_SUSPEND_ON); if (ret) { dev_err(&rdev->dev, "failed to set control voltage to %duV\n", @@ -195,9 +202,10 @@ static int vctrl_set_voltage_sel(struct regulator_dev *rdev, err: if (vctrl->sel != orig_sel) { /* Try to go back to original voltage */ - if (!regulator_set_voltage(ctrl_reg, + if (!regulator_set_voltage_rdev(ctrl_reg->rdev, + vctrl->vtable[orig_sel].ctrl, vctrl->vtable[orig_sel].ctrl, - vctrl->vtable[orig_sel].ctrl)) + PM_SUSPEND_ON)) vctrl->sel = orig_sel; else dev_warn(&rdev->dev, @@ -482,7 +490,7 @@ static int vctrl_probe(struct platform_device *pdev) if (ret) return ret; - ctrl_uV = regulator_get_voltage(vctrl->ctrl_reg); + ctrl_uV = regulator_get_voltage_rdev(vctrl->ctrl_reg->rdev); if (ctrl_uV < 0) { dev_err(&pdev->dev, "failed to get control voltage\n"); return ctrl_uV; -- 2.20.1