From patchwork Wed Sep 4 17:54:19 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 172948 Delivered-To: patch@linaro.org Received: by 2002:ac9:5c4b:0:0:0:0:0 with SMTP id r11csp1045114ocp; Wed, 4 Sep 2019 11:08:14 -0700 (PDT) X-Google-Smtp-Source: APXvYqw0HLvCD3r9geQfbhFlDTlyN/bhSpVvtpOVfoDRQjnLbWgsCwOzuxAj8zyeIEBny35C+Ph0 X-Received: by 2002:a17:90a:890c:: with SMTP id u12mr6282018pjn.124.1567620494795; Wed, 04 Sep 2019 11:08:14 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1567620494; cv=none; d=google.com; s=arc-20160816; b=Gs2HgtA7xFtoOPbgsifq/GTRZ7GpuZDyR8PGyPOTXIz+Sv6n7reASvIXs1bLIT0qtq vOCSR+jnQZ8x9nVYS/HtpPvVySRDTp4HHK3WiYbQz3htA+YfAE1VFpbnbpMS0hEp+dV7 nzfY0Q6SIiu5/bPWDBSw1NxWEr+30duADKP2QhV5aAonX9SAaneFSuO9RceWQCTYZ6JS HrDbbJ8BlMvHZBq4r3CqAEAwhcOXQ1P9FvAG2Msg6G14+XFof0F7u06WdsFCSx1ik+bg jEYhGSfrXlTtIqYA8eayWDwEd5e/Izk0fHUnvC2t7RT0wYkodAiLCJN9V1lf90O7MdQH t9ng== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :user-agent:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=XdXUDPO7PBdPU/JWNleo80P/EVIa9FNIOwNZKATB/vA=; b=igLPdLL2IyRwwGG9KvGK3rRreOqqUP7pcT1yx3fOG1OmnQ6BSOSejrO3bCmLoN6uqv H44qGlCJQm5FNcOLNFVRQ+RClMQ2d9M+lXuCo/IWiskdYaO8z32PBMXyZc/qmCh/Hq+4 VfpmIDjALyuTVC7Sw/uDcRnJ/61frBsuwxR2MVCoVbP/dUTHDPJ/IlctL/obEmRSx4AQ 8FWjSCFDiSbupHtFpVo7JOcsRDDeolOHvUuzI7/UA6P5BiY8W1e+u8aFkkj2wOsU9aN1 2TWmPNw8p05XJBQwe54jTypcOISvymTXJ3Uycws9HuXs8c0Mv6iLcaLxDgnkq6p3xG4H tYtQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=AmXz9VW6; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d13si18568571pgu.268.2019.09.04.11.08.14; Wed, 04 Sep 2019 11:08:14 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=AmXz9VW6; spf=pass (google.com: best guess record for domain of stable-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=stable-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389128AbfIDSIN (ORCPT + 14 others); Wed, 4 Sep 2019 14:08:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:50952 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389734AbfIDSIM (ORCPT ); Wed, 4 Sep 2019 14:08:12 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E89942087E; Wed, 4 Sep 2019 18:08:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1567620491; bh=FCQ49UyAnellf/2lRQYhfrCi+V/oPwiaJ/v5oINvU/8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AmXz9VW6FatDNjkrZPMIJUq5/X6yMrsAAL7bKeCmxR/pVAsb2yr/sCOetwkV/fJdS E6VqBH4gvA6g8yyObg+MoCZ7jbLmjXrrNY6Yj8x+UMKZeL9rZ8CxTpBN7r7g2NKPOd riYXkU3sV+ZGVa3jLZ+k+8YQl8TMIaMK+uwSCJek= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Garry , Wei Xu Subject: [PATCH 4.19 77/93] bus: hisi_lpc: Add .remove method to avoid driver unbind crash Date: Wed, 4 Sep 2019 19:54:19 +0200 Message-Id: <20190904175309.744840990@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20190904175302.845828956@linuxfoundation.org> References: <20190904175302.845828956@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: John Garry commit 10e62b47973b0b0ceda076255bcb147b83e20517 upstream. The original driver author seemed to be under the impression that a driver cannot be removed if it does not have a .remove method. Or maybe if it is a built-in platform driver. This is not true. This crash can be created: root@ubuntu:/sys/bus/platform/drivers/hisi-lpc# echo HISI0191\:00 > unbind root@ubuntu:/sys/bus/platform/drivers/hisi-lpc# ipmitool raw 6 1 Unable to handle kernel paging request at virtual address ffff000010035010 Mem abort info: ESR = 0x96000047 Exception class = DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 Data abort info: ISV = 0, ISS = 0x00000047 CM = 0, WnR = 1 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000000118b000 [ffff000010035010] pgd=0000041ffbfff003, pud=0000041ffbffe003, pmd=0000041ffbffd003, pte=0000000000000000 Internal error: Oops: 96000047 [#1] PREEMPT SMP Modules linked in: CPU: 17 PID: 1473 Comm: ipmitool Not tainted 5.2.0-rc5-00003-gf68c53b414a3-dirty #198 Hardware name: Huawei Taishan 2280 /D05, BIOS Hisilicon D05 IT21 Nemo 2.0 RC0 04/18/2018 pstate: 20000085 (nzCv daIf -PAN -UAO) pc : hisi_lpc_target_in+0x7c/0x120 lr : hisi_lpc_target_in+0x70/0x120 sp : ffff00001efe3930 x29: ffff00001efe3930 x28: ffff841f9f599200 x27: 0000000000000002 x26: 0000000000000000 x25: 0000000000000080 x24: 00000000000000e4 x23: 0000000000000000 x22: 0000000000000064 x21: ffff801fb667d280 x20: 0000000000000001 x19: ffff00001efe39ac x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff841febe60340 x7 : ffff801fb55c52e8 x6 : 0000000000000000 x5 : 0000000000ffc0e3 x4 : 0000000000000001 x3 : ffff801fb667d280 x2 : 0000000000000001 x1 : ffff000010035010 x0 : ffff000010035000 Call trace: hisi_lpc_target_in+0x7c/0x120 hisi_lpc_comm_in+0x88/0x98 logic_inb+0x5c/0xb8 port_inb+0x18/0x20 bt_event+0x38/0x808 smi_event_handler+0x4c/0x5a0 check_start_timer_thread.part.4+0x40/0x58 sender+0x78/0x88 smi_send.isra.6+0x94/0x108 i_ipmi_request+0x2c4/0x8f8 ipmi_request_settime+0x124/0x160 handle_send_req+0x19c/0x208 ipmi_ioctl+0x2c0/0x990 do_vfs_ioctl+0xb8/0x8f8 ksys_ioctl+0x80/0xb8 __arm64_sys_ioctl+0x1c/0x28 el0_svc_common.constprop.0+0x64/0x160 el0_svc_handler+0x28/0x78 el0_svc+0x8/0xc Code: 941d1511 aa0003f9 f94006a0 91004001 (b9000034) ---[ end trace aa842b86af7069e4 ]--- The problem here is that the host goes away but the associated logical PIO region remains registered, as do the children devices. Fix by adding a .remove method to tidy-up by removing the child devices and unregistering the logical PIO region. Cc: stable@vger.kernel.org Fixes: adf38bb0b595 ("HISI LPC: Support the LPC host on Hip06/Hip07 with DT bindings") Signed-off-by: John Garry Signed-off-by: Wei Xu Signed-off-by: Greg Kroah-Hartman --- drivers/bus/hisi_lpc.c | 38 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) --- a/drivers/bus/hisi_lpc.c +++ b/drivers/bus/hisi_lpc.c @@ -456,6 +456,17 @@ struct hisi_lpc_acpi_cell { size_t pdata_size; }; +static void hisi_lpc_acpi_remove(struct device *hostdev) +{ + struct acpi_device *adev = ACPI_COMPANION(hostdev); + struct acpi_device *child; + + device_for_each_child(hostdev, NULL, hisi_lpc_acpi_remove_subdev); + + list_for_each_entry(child, &adev->children, node) + acpi_device_clear_enumerated(child); +} + /* * hisi_lpc_acpi_probe - probe children for ACPI FW * @hostdev: LPC host device pointer @@ -556,8 +567,7 @@ static int hisi_lpc_acpi_probe(struct de return 0; fail: - device_for_each_child(hostdev, NULL, - hisi_lpc_acpi_remove_subdev); + hisi_lpc_acpi_remove(hostdev); return ret; } @@ -570,6 +580,10 @@ static int hisi_lpc_acpi_probe(struct de { return -ENODEV; } + +static void hisi_lpc_acpi_remove(struct device *hostdev) +{ +} #endif // CONFIG_ACPI /* @@ -627,6 +641,8 @@ static int hisi_lpc_probe(struct platfor return ret; } + dev_set_drvdata(dev, lpcdev); + io_end = lpcdev->io_host->io_start + lpcdev->io_host->size; dev_info(dev, "registered range [%pa - %pa]\n", &lpcdev->io_host->io_start, &io_end); @@ -634,6 +650,23 @@ static int hisi_lpc_probe(struct platfor return ret; } +static int hisi_lpc_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct acpi_device *acpi_device = ACPI_COMPANION(dev); + struct hisi_lpc_dev *lpcdev = dev_get_drvdata(dev); + struct logic_pio_hwaddr *range = lpcdev->io_host; + + if (acpi_device) + hisi_lpc_acpi_remove(dev); + else + of_platform_depopulate(dev); + + logic_pio_unregister_range(range); + + return 0; +} + static const struct of_device_id hisi_lpc_of_match[] = { { .compatible = "hisilicon,hip06-lpc", }, { .compatible = "hisilicon,hip07-lpc", }, @@ -647,5 +680,6 @@ static struct platform_driver hisi_lpc_d .acpi_match_table = ACPI_PTR(hisi_lpc_acpi_match), }, .probe = hisi_lpc_probe, + .remove = hisi_lpc_remove, }; builtin_platform_driver(hisi_lpc_driver);