From patchwork Sun Sep 20 21:12:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Krzysztof Kozlowski X-Patchwork-Id: 263773 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=-14.6 required=3.0 tests=BAYES_00,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 2CD5FC43465 for ; Sun, 20 Sep 2020 21:12:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DB6782085B for ; Sun, 20 Sep 2020 21:12:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600636374; bh=OFg8udfCfwBzHEhbuaN6LUxKWixXaUOIv34Fpv3yvaQ=; h=From:To:Cc:Subject:Date:List-ID:From; b=Thmi/ZaKKpQux1SGJs+2w1SYP8MGGBawZuk4qX7sKLDdNdgY8JdLnEiJ6ifN927Nc 7Q0ZUpHLtqCWRAx1RqO0G+Co6m+DxikyNVG3kOBx5vAWuPpfX49Z5D+ugN7fKq6JmE iYFdH9p1am/xQK5koHlCy//Z6SUs6Mi8s7MvWpJQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726221AbgITVMy (ORCPT ); Sun, 20 Sep 2020 17:12:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:40278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726126AbgITVMy (ORCPT ); Sun, 20 Sep 2020 17:12:54 -0400 Received: from localhost.localdomain (unknown [194.230.155.191]) (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 ECB3720829; Sun, 20 Sep 2020 21:12:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600636373; bh=OFg8udfCfwBzHEhbuaN6LUxKWixXaUOIv34Fpv3yvaQ=; h=From:To:Cc:Subject:Date:From; b=Ja4F9Vfw+sO1MQwL3z/jS6chdVbL+hX9+RBtKYIJnGaeyzkxlR4OhWcHid45ZGlig 3ZwKdPLMEuC42u4POfpMTLBSx3E4pTGYnYqXQT/88oH9Sx8SKsoIVmFPMr7C7d4Py+ S0xmIsuhOf2WL738wVViFCXE/UrE/xyWyZwP5Lx8= From: Krzysztof Kozlowski To: Oleksij Rempel , Pengutronix Kernel Team , Shawn Guo , Sascha Hauer , Fabio Estevam , NXP Linux Team , Wolfram Sang , linux-i2c@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Krzysztof Kozlowski , stable@vger.kernel.org Subject: [PATCH v3] i2c: imx: Fix external abort on interrupt in exit paths Date: Sun, 20 Sep 2020 23:12:38 +0200 Message-Id: <20200920211238.13920-1-krzk@kernel.org> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org If interrupt comes late, during probe error path or device remove (could be triggered with CONFIG_DEBUG_SHIRQ), the interrupt handler i2c_imx_isr() will access registers with the clock being disabled. This leads to external abort on non-linefetch on Toradex Colibri VF50 module (with Vybrid VF5xx): Unhandled fault: external abort on non-linefetch (0x1008) at 0x8882d003 Internal error: : 1008 [#1] ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.7.0 #607 Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree) (i2c_imx_isr) from [<8017009c>] (free_irq+0x25c/0x3b0) (free_irq) from [<805844ec>] (release_nodes+0x178/0x284) (release_nodes) from [<80580030>] (really_probe+0x10c/0x348) (really_probe) from [<80580380>] (driver_probe_device+0x60/0x170) (driver_probe_device) from [<80580630>] (device_driver_attach+0x58/0x60) (device_driver_attach) from [<805806bc>] (__driver_attach+0x84/0xc0) (__driver_attach) from [<8057e228>] (bus_for_each_dev+0x68/0xb4) (bus_for_each_dev) from [<8057f3ec>] (bus_add_driver+0x144/0x1ec) (bus_add_driver) from [<80581320>] (driver_register+0x78/0x110) (driver_register) from [<8010213c>] (do_one_initcall+0xa8/0x2f4) (do_one_initcall) from [<80c0100c>] (kernel_init_freeable+0x178/0x1dc) (kernel_init_freeable) from [<80807048>] (kernel_init+0x8/0x110) (kernel_init) from [<80100114>] (ret_from_fork+0x14/0x20) Additionally, the i2c_imx_isr() could wake up the wait queue (imx_i2c_struct->queue) before its initialization happens. The resource-managed framework should not be used for interrupt handling, because the resource will be released too late - after disabling clocks. The interrupt handler is not prepared for such case. Fixes: 1c4b6c3bcf30 ("i2c: imx: implement bus recovery") Cc: Signed-off-by: Krzysztof Kozlowski Acked-by: Oleksij Rempel --- Changes since v2: 1. Rebase Changes since v1: 1. Remove the devm- and use regular methods. --- drivers/i2c/busses/i2c-imx.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index 63f4367c312b..c98529c76348 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -1169,14 +1169,6 @@ static int i2c_imx_probe(struct platform_device *pdev) return ret; } - /* Request IRQ */ - ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, IRQF_SHARED, - pdev->name, i2c_imx); - if (ret) { - dev_err(&pdev->dev, "can't claim irq %d\n", irq); - goto clk_disable; - } - /* Init queue */ init_waitqueue_head(&i2c_imx->queue); @@ -1195,6 +1187,14 @@ static int i2c_imx_probe(struct platform_device *pdev) if (ret < 0) goto rpm_disable; + /* Request IRQ */ + ret = request_threaded_irq(irq, i2c_imx_isr, NULL, IRQF_SHARED, + pdev->name, i2c_imx); + if (ret) { + dev_err(&pdev->dev, "can't claim irq %d\n", irq); + goto rpm_disable; + } + /* Set up clock divider */ i2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ; ret = of_property_read_u32(pdev->dev.of_node, @@ -1237,13 +1237,12 @@ static int i2c_imx_probe(struct platform_device *pdev) clk_notifier_unregister: clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb); + free_irq(irq, i2c_imx); rpm_disable: pm_runtime_put_noidle(&pdev->dev); pm_runtime_disable(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); - -clk_disable: clk_disable_unprepare(i2c_imx->clk); return ret; } @@ -1251,7 +1250,7 @@ static int i2c_imx_probe(struct platform_device *pdev) static int i2c_imx_remove(struct platform_device *pdev) { struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev); - int ret; + int irq, ret; ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) @@ -1271,6 +1270,9 @@ static int i2c_imx_remove(struct platform_device *pdev) imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR); clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb); + irq = platform_get_irq(pdev, 0); + if (irq >= 0) + free_irq(irq, i2c_imx); clk_disable_unprepare(i2c_imx->clk); pm_runtime_put_noidle(&pdev->dev);