From patchwork Mon Mar 9 15:24:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linus Walleij X-Patchwork-Id: 1251613 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=D/SW5tys; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48bhqF0fTYz9sPK for ; Tue, 10 Mar 2020 02:24:57 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726918AbgCIPY4 (ORCPT ); Mon, 9 Mar 2020 11:24:56 -0400 Received: from mail-lj1-f194.google.com ([209.85.208.194]:34373 "EHLO mail-lj1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726810AbgCIPYz (ORCPT ); Mon, 9 Mar 2020 11:24:55 -0400 Received: by mail-lj1-f194.google.com with SMTP id s13so1165810ljm.1 for ; Mon, 09 Mar 2020 08:24:54 -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=jbDLYusSnM6pIqjjnhoz0pEG1Av/QiUIZjymydPONDM=; b=D/SW5tysueaKyWZGSiV2gS+rHzi+MdjpefC0HsRBSZ82fmjSRNcEX8R3ol/PDclgNa NaoWVDVdYrrF9T0JWEZvwTKmvdPB1TtYK8i8mpZm4sE51rRyHNLheHZ1kz/SrAFF9BRZ Ri5ild8YtgfzAFBZCgXhLfx3Og7Xne4okCG7cy4iFtwGSY3VM1T9vtfcpWzaRY0sRaIr pAPKEPZuNV9b1XW9ls42JFqNYUr0kKl97O67bXLyoal38WAgHAiPzn5iq+KhF0lYvGjr 7ju0k/CfBpnvMi6Ai2zp8y5LHCcKzDsl/B5maqJ0DPNsh/vFlePv8JX1Er4jRZFaGOX9 izZQ== 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=jbDLYusSnM6pIqjjnhoz0pEG1Av/QiUIZjymydPONDM=; b=nPoMP4SBHGD8FEA9bfWTUyemeLL5y1bmwo+t3X5gTKBl2QfjEvQIF5IWmWChaMdibo sQGnTRmW721/FeTLzBz26RpYxgXyXV/BX4RJv1kCY9gS81xqZgKhWiz4HxchjBxIALtz wcWEUsw9ad7IRqJYddUL5OePYtfQq1xzeVKHe4cjOHvwAa6KB/IvcyKWnBlTRUs4ql9A HloQ6TmMevG7tFaa6QgeYJ4XBq1FVKwuxLpS4iJgUAGlF6UDFNR8VXr+Z14iJmovJr1o 3o0Tixjc0im8psDluXuDmFIGLc6TfQhvC+mEv3i+GUC8TlBEMSit21K2EKH16GeiBuum B9YQ== X-Gm-Message-State: ANhLgQ3cYLb8vAgU4yu6qbXOQMeYlMMTEm4hnA7q67HyHQP6jApwfIao WedkAZPJTulI3ZShqkF3Qi01EICJ1Gg= X-Google-Smtp-Source: ADFU+vumSmmpcbUV4GBhSbfgzl204I7hwfHYv74YYnfGWpjaCDBPA+udq/cFB7VVqxqeU7/eCHpg9Q== X-Received: by 2002:a2e:b892:: with SMTP id r18mr10046087ljp.252.1583767493243; Mon, 09 Mar 2020 08:24:53 -0700 (PDT) Received: from genomnajs.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id c20sm14705688lfb.60.2020.03.09.08.24.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2020 08:24:52 -0700 (PDT) From: Linus Walleij To: linux-gpio@vger.kernel.org Cc: Linus Walleij , David Heidelberg , Bjorn Andersson , Lina Iyer , Marc Zyngier , Stephen Boyd , stable@vger.kernel.org Subject: [PATCH v3] pinctrl: qcom: Assign irq_disable/eoi conditionally Date: Mon, 9 Mar 2020 16:24:46 +0100 Message-Id: <20200309152446.584797-1-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_eoi is 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_eoi conditionally if we are actually using a wakeup parent. Cc: David Heidelberg 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") Link: https://lore.kernel.org/r/20200306121221.1231296-1-linus.walleij@linaro.org Link: https://lore.kernel.org/r/20200309125207.571840-1-linus.walleij@linaro.org Tested-by: David Heidelberg Signed-off-by: Linus Walleij --- ChangeLog v2->v3: - Keep .irq_disable() around, just make the assignment of .irq_eoi() conditional. 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 | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c index 9a8daa256a32..1a948c3f54b7 100644 --- a/drivers/pinctrl/qcom/pinctrl-msm.c +++ b/drivers/pinctrl/qcom/pinctrl-msm.c @@ -1104,7 +1104,6 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl) 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 +1117,7 @@ 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_eoi = irq_chip_eoi_parent; /* * Let's skip handling the GPIOs, if the parent irqchip * is handling the direct connect IRQ of the GPIO.