From nobody Wed Dec 17 06:51:57 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D53AC4332F for ; Tue, 12 Dec 2023 04:38:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229606AbjLLEiP (ORCPT ); Mon, 11 Dec 2023 23:38:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229568AbjLLEiN (ORCPT ); Mon, 11 Dec 2023 23:38:13 -0500 Received: from smtp-relay-canonical-1.canonical.com (smtp-relay-canonical-1.canonical.com [185.125.188.121]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DBD7C3; Mon, 11 Dec 2023 20:38:19 -0800 (PST) Received: from HP-EliteBook-x360-830-G8-Notebook-PC.. (unknown [10.101.196.174]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 2DE133F5F0; Tue, 12 Dec 2023 04:38:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1702355897; bh=/qGLH35G0X6xfe6HCmaahj0vMyZ8u2Pq0pAO8gN/qQA=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=g/PjGgoahE2moDACRBcfxvGEh6dzeGyNxTmbj/dyb6je5okTwn8i97e1vn5xKkvfl MuqFtc3+aEnr3xDagQcXGBTmNLOMdZVivWba/03uIb91ryf3K/iF2/9IuaX/KCF8UH XnifEX7sJW1P9vxY+jyzNeCaf+44UHrYQ/9ZXLDO8TRqJyE6hU1GR8WIp/5qbKA6ap pbZ65RwSgEmD3wEADl6hn16QBVuRHXbTNnNtxcFfZimQhvAKcPQjqoey89CbsCaffo kWDzwBQvt6lhvC7j98QHoWHtBEW7VF3nREPMtt3T+LiJKG3zdG9CQfp50ueZADRD00 nKO36Z8YTg0kA== From: Kai-Heng Feng To: bhelgaas@google.com Cc: linux-pm@vger.kernel.org, linux-mmc@vger.kernel.org, Kai-Heng Feng , Ricky Wu , Kees Cook , Tony Luck , "Guilherme G. Piccoli" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v2] PCI: Prevent device from doing RPM when it's unplugged Date: Tue, 12 Dec 2023 12:38:07 +0800 Message-Id: <20231212043808.212754-1-kai.heng.feng@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When inserting an SD7.0 card to Realtek card reader, the card reader unplugs itself and morph into a NVMe device. The slot Link down on hot unplugged can cause the following error: [ 63.898861] pcieport 0000:00:1c.0: pciehp: Slot(8): Link Down [ 63.912118] BUG: unable to handle page fault for address: ffffb24d403e50= 10 [ 63.912122] #PF: supervisor read access in kernel mode [ 63.912125] #PF: error_code(0x0000) - not-present page [ 63.912126] PGD 100000067 P4D 100000067 PUD 1001fe067 PMD 100d97067 PTE 0 [ 63.912131] Oops: 0000 [#1] PREEMPT SMP PTI [ 63.912134] CPU: 3 PID: 534 Comm: kworker/3:10 Not tainted 6.4.0 #6 [ 63.912137] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M.= /H370M Pro4, BIOS P3.40 10/25/2018 [ 63.912138] Workqueue: pm pm_runtime_work [ 63.912144] RIP: 0010:ioread32+0x2e/0x70 [ 63.912148] Code: ff 03 00 77 25 48 81 ff 00 00 01 00 77 14 8b 15 08 d9 = 54 01 b8 ff ff ff ff 85 d2 75 14 c3 cc cc cc cc 89 fa ed c3 cc cc cc cc <8b= > 07 c3 cc cc cc cc 55 83 ea 01 48 89 fe 48 c7 c7 98 6f 15 99 48 [ 63.912150] RSP: 0018:ffffb24d40a5bd78 EFLAGS: 00010296 [ 63.912152] RAX: ffffb24d403e5000 RBX: 0000000000000152 RCX: 00000000000= 0007f [ 63.912153] RDX: 000000000000ff00 RSI: ffffb24d403e5010 RDI: ffffb24d403= e5010 [ 63.912155] RBP: ffffb24d40a5bd98 R08: ffffb24d403e5010 R09: 00000000000= 00000 [ 63.912156] R10: ffff9074cd95e7f4 R11: 0000000000000003 R12: 00000000000= 0007f [ 63.912158] R13: ffff9074e1a68c00 R14: ffff9074e1a68d00 R15: 00000000000= 09003 [ 63.912159] FS: 0000000000000000(0000) GS:ffff90752a180000(0000) knlGS:= 0000000000000000 [ 63.912161] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 63.912162] CR2: ffffb24d403e5010 CR3: 0000000152832006 CR4: 00000000003= 706e0 [ 63.912164] Call Trace: [ 63.912165] [ 63.912167] ? show_regs+0x68/0x70 [ 63.912171] ? __die_body+0x20/0x70 [ 63.912173] ? __die+0x2b/0x40 [ 63.912175] ? page_fault_oops+0x160/0x480 [ 63.912177] ? search_bpf_extables+0x63/0x90 [ 63.912180] ? ioread32+0x2e/0x70 [ 63.912183] ? search_exception_tables+0x5f/0x70 [ 63.912186] ? kernelmode_fixup_or_oops+0xa2/0x120 [ 63.912189] ? __bad_area_nosemaphore+0x179/0x230 [ 63.912191] ? bad_area_nosemaphore+0x16/0x20 [ 63.912193] ? do_kern_addr_fault+0x8b/0xa0 [ 63.912195] ? exc_page_fault+0xe5/0x180 [ 63.912198] ? asm_exc_page_fault+0x27/0x30 [ 63.912203] ? ioread32+0x2e/0x70 [ 63.912206] ? rtsx_pci_write_register+0x5b/0x90 [rtsx_pci] [ 63.912217] rtsx_set_l1off_sub+0x1c/0x30 [rtsx_pci] [ 63.912226] rts5261_set_l1off_cfg_sub_d0+0x36/0x40 [rtsx_pci] [ 63.912234] rtsx_pci_runtime_idle+0xc7/0x160 [rtsx_pci] [ 63.912243] ? __pfx_pci_pm_runtime_idle+0x10/0x10 [ 63.912246] pci_pm_runtime_idle+0x34/0x70 [ 63.912248] rpm_idle+0xc4/0x2b0 [ 63.912251] pm_runtime_work+0x93/0xc0 [ 63.912254] process_one_work+0x21a/0x430 [ 63.912258] worker_thread+0x4a/0x3c0 [ 63.912261] ? __pfx_worker_thread+0x10/0x10 [ 63.912263] kthread+0x106/0x140 [ 63.912266] ? __pfx_kthread+0x10/0x10 [ 63.912268] ret_from_fork+0x29/0x50 [ 63.912273] [ 63.912274] Modules linked in: nvme nvme_core snd_hda_codec_hdmi snd_sof= _pci_intel_cnl snd_sof_intel_hda_common snd_hda_codec_realtek snd_hda_codec= _generic snd_soc_hdac_hda soundwire_intel ledtrig_audio nls_iso8859_1 sound= wire_generic_allocation soundwire_cadence snd_sof_intel_hda_mlink snd_sof_i= ntel_hda snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_sof_utils snd_hda_ext_c= ore snd_soc_acpi_intel_match snd_soc_acpi soundwire_bus snd_soc_core snd_co= mpress ac97_bus snd_pcm_dmaengine snd_hda_intel i915 snd_intel_dspcfg snd_i= ntel_sdw_acpi intel_rapl_msr snd_hda_codec intel_rapl_common snd_hda_core x= 86_pkg_temp_thermal intel_powerclamp snd_hwdep coretemp snd_pcm kvm_intel d= rm_buddy ttm mei_hdcp kvm drm_display_helper snd_seq_midi snd_seq_midi_even= t cec crct10dif_pclmul ghash_clmulni_intel sha512_ssse3 aesni_intel crypto_= simd rc_core cryptd rapl snd_rawmidi drm_kms_helper binfmt_misc intel_cstat= e i2c_algo_bit joydev snd_seq snd_seq_device syscopyarea wmi_bmof snd_timer= sysfillrect input_leds snd ee1004 sysimgblt mei_me soundcore [ 63.912324] mei intel_pch_thermal mac_hid acpi_tad acpi_pad sch_fq_code= l msr parport_pc ppdev lp ramoops drm parport reed_solomon efi_pstore ip_ta= bles x_tables autofs4 hid_generic usbhid hid rtsx_pci_sdmmc crc32_pclmul ah= ci e1000e i2c_i801 i2c_smbus rtsx_pci xhci_pci libahci xhci_pci_renesas vid= eo wmi [ 63.912346] CR2: ffffb24d403e5010 [ 63.912348] ---[ end trace 0000000000000000 ]--- This happens because scheduled pm_runtime_idle() is not cancelled. So before releasing the device, stop all runtime power managements by using pm_runtime_barrier() to fix the issue. Link: https://lore.kernel.org/all/2ce258f371234b1f8a1a470d5488d00e@realtek.= com/ Tested-by: Ricky Wu --- v2: Cover more cases than just pciehp. =20 drivers/pci/remove.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c index d749ea8250d6..c69b4ce5dbfd 100644 --- a/drivers/pci/remove.c +++ b/drivers/pci/remove.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include #include +#include #include "pci.h" =20 static void pci_free_resources(struct pci_dev *dev) @@ -18,6 +19,7 @@ static void pci_stop_dev(struct pci_dev *dev) pci_pme_active(dev, false); =20 if (pci_dev_is_added(dev)) { + pm_runtime_barrier(&dev->dev); =20 device_release_driver(&dev->dev); pci_proc_detach_device(dev); --=20 2.34.1