From patchwork Mon Mar 20 04:22:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hongyu Xie X-Patchwork-Id: 665820 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 C1E1CC7618A for ; Mon, 20 Mar 2023 04:22:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229670AbjCTEWm (ORCPT ); Mon, 20 Mar 2023 00:22:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229460AbjCTEWk (ORCPT ); Mon, 20 Mar 2023 00:22:40 -0400 Received: from mail-pj1-f51.google.com (mail-pj1-f51.google.com [209.85.216.51]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4B651F5EB; Sun, 19 Mar 2023 21:22:38 -0700 (PDT) Received: by mail-pj1-f51.google.com with SMTP id d13so10909512pjh.0; Sun, 19 Mar 2023 21:22:38 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1679286158; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=bLXhUvKnHXgKEr0Ttn0oR6j5Cn4+cPvwzE2+42+f0uk=; b=m89a8PcQWBojMD5M5NayAY/thDhTqrI5mhDMQ/qZJ9at2HakC7UQPG79sshlGjC4Nf LyI9HfW/wuU079hZCVuqTANn102cXlk+v2u6MvXGRpC8rj+x7rJTSy4Y96mJFQVJDOtQ twbkcuuIlBuAwCPWf3oqkNPyR/CnwUegdEAL/tDmvGQYEohyBA/yOl+v3tlOkIv++g1C J6ifPa7GsPOiLHgGP2ZPQbjWzJrT0ZLjNMNi2p2BXZ7c7E6lY6zajAGZsO0JFoa3IJGi /zdo8Q2aE3HF3+b45ed6f5SYSqRU7om2pssuIs8SlYiMCJoBu+KMPxRErmoUl7cb3vLQ eJwg== X-Gm-Message-State: AO0yUKV3/VmKcjJGflSAwROgDuF1fxriC7nrj5cTgZz+e+oIOLvVRC0T Umi5ksFkJiWZJMRY5tViVY+hWUAJjxuDkSBI X-Google-Smtp-Source: AK7set9Fvk1ODFIfFQLYA9seh+p96kxjQ9q+WLDoH0md+Cb8Gpl0tEztzniSyvfZKPYzbnXNJDTWTw== X-Received: by 2002:a17:902:e849:b0:1a0:616d:7618 with SMTP id t9-20020a170902e84900b001a0616d7618mr17458753plg.51.1679286158333; Sun, 19 Mar 2023 21:22:38 -0700 (PDT) Received: from localhost ([116.128.244.169]) by smtp.gmail.com with ESMTPSA id 12-20020a170902c24c00b0019e5fc3c7e6sm5505632plg.101.2023.03.19.21.22.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Mar 2023 21:22:38 -0700 (PDT) From: Hongyu Xie To: mathias.nyman@intel.com, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Hongyu Xie , sunke Subject: [PATCH -next] usb: xhci: do not free an empty cmd ring Date: Mon, 20 Mar 2023 12:22:23 +0800 Message-Id: <20230320042223.676505-1-xiehongyu1@kylinos.cn> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org It was first found on HUAWEI Kirin 9006C platform with a builtin xhci controller during stress cycle test(stress-ng, glmark2, x11perf, S4...). phase one: [26788.706878] PM: dpm_run_callback(): platform_pm_thaw+0x0/0x68 returns -12 [26788.706878] PM: Device xhci-hcd.1.auto failed to thaw async: error -12 ... phase two: [28650.583496] [2023:01:19 04:43:29]Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 ... [28650.583526] user pgtable: 4k pages, 39-bit VAs, pgdp=000000027862a000 [28650.583557] [0000000000000028] pgd=0000000000000000 ... [28650.583587] pc : xhci_suspend+0x154/0x5b0 [28650.583618] lr : xhci_suspend+0x148/0x5b0 [28650.583618] sp : ffffffc01c7ebbd0 [28650.583618] x29: ffffffc01c7ebbd0 x28: ffffffec834d0000 [28650.583618] x27: ffffffc0106a3cc8 x26: ffffffb2c540c848 [28650.583618] x25: 0000000000000000 x24: ffffffec82ee30b0 [28650.583618] x23: ffffffb43b31c2f8 x22: 0000000000000000 [28650.583618] x21: 0000000000000000 x20: ffffffb43b31c000 [28650.583648] x19: ffffffb43b31c2a8 x18: 0000000000000001 [28650.583648] x17: 0000000000000803 x16: 00000000fffffffe [28650.583648] x15: 0000000000001000 x14: ffffffb150b67e00 [28650.583648] x13: 00000000f0000000 x12: 0000000000000001 [28650.583648] x11: 0000000000000000 x10: 0000000000000a80 [28650.583648] x9 : ffffffc01c7eba00 x8 : ffffffb43ad10ae0 [28650.583648] x7 : ffffffb84cd98dc0 x6 : 0000000cceb6a101 [28650.583679] x5 : 00ffffffffffffff x4 : 0000000000000001 [28650.583679] x3 : 0000000000000011 x2 : 0000000000e2cfa8 [28650.583679] x1 : 00000000823535e1 x0 : 0000000000000000 gdb: (gdb) l *(xhci_suspend+0x154) 0xffffffc010b6cd44 is in xhci_suspend (/.../drivers/usb/host/xhci.c:854). 849 { 850 struct xhci_ring *ring; 851 struct xhci_segment *seg; 852 853 ring = xhci->cmd_ring; 854 seg = ring->deq_seg; (gdb) disassemble 0xffffffc010b6cd44 ... 0xffffffc010b6cd40 <+336>: ldr x22, [x19, #160] 0xffffffc010b6cd44 <+340>: ldr x20, [x22, #40] 0xffffffc010b6cd48 <+344>: mov w1, #0x0 // #0 During phase one, platform_pm_thaw called xhci_plat_resume which called xhci_resume. The rest possible calling routine might be xhci_resume->xhci_init->xhci_mem_init, and xhci->cmd_ring was cleaned in xhci_mem_cleanup before xhci_mem_init returned -ENOMEM. During phase two, systemd was tring to hibernate again and called xhci_suspend, then xhci_clear_command_ring dereferenced xhci->cmd_ring which was already NULL. So if xhci->cmd_ring is NULL, xhci_clear_command_ring just return. Co-developed-by: sunke Signed-off-by: sunke Signed-off-by: Hongyu Xie --- drivers/usb/host/xhci.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 6183ce8574b1..8b79ad2955e5 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -919,6 +919,10 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci) { struct xhci_ring *ring; struct xhci_segment *seg; + if (!xhci->cmd_ring) { + xhci_err(xhci, "Empty cmd ring"); + return; + } ring = xhci->cmd_ring; seg = ring->deq_seg;