From patchwork Mon Mar 9 12:52:07 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 1251565 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=u0L8Y1dk; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48bdR26QFWz9sPg for ; Mon, 9 Mar 2020 23:52:14 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726368AbgCIMwN (ORCPT ); Mon, 9 Mar 2020 08:52:13 -0400 Received: from mail-lj1-f194.google.com ([209.85.208.194]:46031 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726391AbgCIMwN (ORCPT ); Mon, 9 Mar 2020 08:52:13 -0400 Received: by mail-lj1-f194.google.com with SMTP id e18so9765056ljn.12 for ; Mon, 09 Mar 2020 05:52:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=8jYBuqb72AK3TYTrpjzcg5ppPY/IO7sFjcVnsEoUJUs=; b=u0L8Y1dkuQof2IQS0cJbbgpuEDPnAhllOQrrD4TX1NmbRjv8aJ2gsymPzjuFZjRxYj oxz1LVWqxSF4QhVMK8X8S7Npkt5idEIRYNDx/BvEFz+GVcqyNPi1P2xaxfmBBS8cCCkQ +xYNgr0K61EANA6R+4lrfB19k7BMdO+6ETuZx5ecVoqSSazYcWWzZg1fRcXFFWYZGw6N 68y+1jdPc+S0QI7CAUbdi5Wl/VjdJ/xb0hyLmZ6giJH7C4YpRL22/Z3YhRCG+Ld2ULWp NBQizi2sKA+R/U9MZX1fLqajpR9ymuKmGwCFY9edZ+OiGlG10BubQa7ypTuSzt9f9SkX GTKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=8jYBuqb72AK3TYTrpjzcg5ppPY/IO7sFjcVnsEoUJUs=; b=icyNJtMM9fPMCyDQdZ0/HhQBAsty9AK5z4qxAjWD6UyhlXXX5ZbKO8LfAoBoSE2wLO UWwJZt0E3wBrhZodNDVzlMQdC2Taq8fwmhsgjhSFCc0YlytCCpWmcKT6vKPg5oKsI5uc ZIGD1zvykreoNG3TFb4Ib+fnIbOL3OlBC337hZFwRhdd7HfhdICmQKjp0wngRAiygrP4 HNicthZRrX6WjA3CYu394V81jLv0vI+YnUgoCTir94P43QfdOFEMB7QJPevPHbJBCubV vKV9TVVjLhlAikU5pPXqQaDWg9sKy5WJk4bUcVZCQhZ9WCXgIpRn+Vj5rsb008zCPiiJ kY+w== X-Gm-Message-State: ANhLgQ3ABm0Slqc17dPvgwPz+2Em0DJF3HaqJ9ED7vgII4CmZ1fCCcRx oUphvHOZUuaZbYH6WBY0cS59LHz/HAQ= X-Google-Smtp-Source: ADFU+vu/HK0rkNYZal/GmZ0rmHgzPK1yezejj8bxI79CUI04kMjtXjxPmfi3xnEhFcK/mo4kIegmVA== X-Received: by 2002:a2e:3210:: with SMTP id y16mr5093105ljy.49.1583758330651; Mon, 09 Mar 2020 05:52:10 -0700 (PDT) Received: from genomnajs.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id 133sm3122755ljj.91.2020.03.09.05.52.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2020 05:52:10 -0700 (PDT) From: Linus Walleij To: linux-gpio@vger.kernel.org Cc: Linus Walleij , Bjorn Andersson , Lina Iyer , Marc Zyngier , Stephen Boyd , stable@vger.kernel.org Subject: [PATCH v2] pinctrl: qcom: Assign irq_disable/eoi conditionally Date: Mon, 9 Mar 2020 13:52:07 +0100 Message-Id: <20200309125207.571840-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org The hierarchical parts of MSM pinctrl/GPIO is only used when the device tree has a "wakeup-parent" as a phandle, but the .irq_disable and .irq_eoi are anyway assigned leading to semantic problems on elder Qualcomm chipsets. When the drivers/mfd/qcom-pm8xxx.c driver calls chained_irq_exit() that call will in turn call chip->irq_eoi() which is set to irq_chip_eoi_parent() by default on a hierachical IRQ chip, and the parent is pinctrl-msm.c so that will in turn unconditionally call irq_chip_eoi_parent() again, but its parent is invalid so we get the following crash: Unnable to handle kernel NULL pointer dereference at virtual address 00000010 pgd = (ptrval) [00000010] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM (...) PC is at irq_chip_eoi_parent+0x4/0x10 LR is at pm8xxx_irq_handler+0x1b4/0x2d8 If we solve this crash by avoiding to call up to irq_chip_eoi_parent(), the machine will hang and get reset by the watchdog, because of semantic issues, probably inside irq_chip. As a solution, just assign the .irq_disable and .irq_eoi condtionally if we are actually using a wakeup parent. Cc: Bjorn Andersson Cc: Lina Iyer Cc: Marc Zyngier Cc: Stephen Boyd Cc: stable@vger.kernel.org Fixes: e35a6ae0eb3a ("pinctrl/msm: Setup GPIO chip in hierarchy") Signed-off-by: Linus Walleij --- ChangeLog v1->v2: - Noticed that the previous solution doesn't actually work, the machine hangs and reboots intead (even if it got rid of the most obvious crash). Make a more thorough solution that completely avoids using these callbacks if we don't have a parent. - v1 was called "Guard irq_eoi()" --- drivers/pinctrl/qcom/pinctrl-msm.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c index 9a8daa256a32..fe3c53ae25f4 100644 --- a/drivers/pinctrl/qcom/pinctrl-msm.c +++ b/drivers/pinctrl/qcom/pinctrl-msm.c @@ -1100,11 +1100,9 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl) pctrl->irq_chip.name = "msmgpio"; pctrl->irq_chip.irq_enable = msm_gpio_irq_enable; - pctrl->irq_chip.irq_disable = msm_gpio_irq_disable; pctrl->irq_chip.irq_mask = msm_gpio_irq_mask; pctrl->irq_chip.irq_unmask = msm_gpio_irq_unmask; pctrl->irq_chip.irq_ack = msm_gpio_irq_ack; - pctrl->irq_chip.irq_eoi = irq_chip_eoi_parent; pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type; pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake; pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres; @@ -1118,7 +1116,8 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl) if (!chip->irq.parent_domain) return -EPROBE_DEFER; chip->irq.child_to_parent_hwirq = msm_gpio_wakeirq; - + pctrl->irq_chip.irq_disable = msm_gpio_irq_disable; + pctrl->irq_chip.irq_eoi = irq_chip_eoi_parent; /* * Let's skip handling the GPIOs, if the parent irqchip * is handling the direct connect IRQ of the GPIO.