From patchwork Fri Aug 26 07:58:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ray Chi X-Patchwork-Id: 12955633 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 3A549ECAAD2 for ; Fri, 26 Aug 2022 07:58:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245759AbiHZH6t (ORCPT ); Fri, 26 Aug 2022 03:58:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245695AbiHZH6s (ORCPT ); Fri, 26 Aug 2022 03:58:48 -0400 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D85B2D474B for ; Fri, 26 Aug 2022 00:58:44 -0700 (PDT) Received: by mail-pg1-x549.google.com with SMTP id m22-20020a6562d6000000b0042a7471b984so507197pgv.4 for ; Fri, 26 Aug 2022 00:58:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc; bh=a6nmZzERx5jmaa+H9eWn+VAql7U9519YoIZhrItY5vc=; b=qKnQTpW6EfBm2KqU+KthgTUBLjGgE+LzDkwCVdsC6ZRuRl0KKlRuxye/RulVZAfKIO RpVMutX1FHKAO3UO8iTUi2cyx1TE+pOPsqxn8htKUopYETNZy80CxTKTl+1NGGrqRJfn U1R4tkR7Cn1b6N3P/alCxMSMqmpsPh0hjfbEIsdKWRyWtdxLm+vfDNjmdDxx51QD1AiN IsrMB4QodF6kUaExRQMo9K9yKlGMuRV6zcqZLxcCiuTTw+qZXTL0EVPnrr9MGljV1p/F jYpqJrIfGrany/KPFm7moXprdCPi6DuCbEZsJo5ue1RlNwzxjEZfZAcB44XVtHro7THi ibGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc; bh=a6nmZzERx5jmaa+H9eWn+VAql7U9519YoIZhrItY5vc=; b=aijFxsBTWW0gtZr1tIrIkS7svMmS/+Ike5OybCCu85MwMcq446NIsnOLIzD7duWXkT ditq7Gp0j1SIWfWUUe3QkDysirN1qupIfu13Hzwb8hLfOVj+o43qtNYW8bj5f4HpAY9t x/RHa4EJ9exSJ2Cmd4R7G+vXaxP5+Darz4HpUBcIleKuaNXIDOP6WjArgDZAnxu1e0RJ RtvPXmCGg7Im6S3/S0roDUtnUWdH+sO/UIMcxis0C6R4t2+xKHVOzxC36BFEcnqOU2tq 77gTDllInW891JJc9xVhuiP8q4pK7/hYREq3zWlmH4hhb8lwcF+5IbTscWgZEAvvtXus ZrqA== X-Gm-Message-State: ACgBeo38yxnXVj8UcDIIN8ZJAu5yzb/DhKiEKdLQhracFlceXhcN7dHT VcV7CZ0kPIBF1Li7Jk4mILCb4NRPmv0= X-Google-Smtp-Source: AA6agR5WkTeV6YDAkISWDVu/oQCYIjdhnEyvHFCjBqbhVzVSUPixE08WUwx7ARpH3GN1fBBttpOWyRyQbQs= X-Received: from raychi.tao.corp.google.com ([2401:fa00:fc:202:7c89:f723:158f:fc]) (user=raychi job=sendgmr) by 2002:aa7:8c4a:0:b0:537:aae3:783e with SMTP id e10-20020aa78c4a000000b00537aae3783emr2802435pfd.64.1661500724402; Fri, 26 Aug 2022 00:58:44 -0700 (PDT) Date: Fri, 26 Aug 2022 15:58:39 +0800 Mime-Version: 1.0 X-Mailer: git-send-email 2.37.2.672.g94769d06f0-goog Message-ID: <20220826075839.292615-1-raychi@google.com> Subject: [PATCH] usb: core: stop USB enumeration if too many retries From: Ray Chi To: gregkh@linuxfoundation.org, mathias.nyman@linux.intel.com, stern@rowland.harvard.edu Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, albertccwang@google.com, badhri@google.com, pumahsu@google.com, Ray Chi Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org If a broken accessory connected to a USB host, usbcore might keep doing enumeration retries and it will take a long time to cause system unstable. This patch provides a quirk to specific USB ports of the hub to stop USB enumeration if needed. Signed-off-by: Ray Chi --- drivers/usb/core/hub.c | 33 +++++++++++++++++++++++++++++++++ include/linux/usb.h | 3 +++ 2 files changed, 36 insertions(+) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 2633acde7ac1..0f4097440ffb 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3081,6 +3081,28 @@ static int hub_port_reset(struct usb_hub *hub, int port1, return status; } +/* Stop enumerate if the port met errors and quirk is set */ +static bool hub_port_stop_enumerate(struct usb_hub *hub, int port1, int retries) +{ + struct usb_port *port_dev = hub->ports[port1 - 1]; + struct usb_device *hdev = hub->hdev; + + if (retries < (PORT_INIT_TRIES - 1) / 2) + return false; + + /* + * Some USB hosts can't take a long time to keep doing enumeration + * retry. After doing half of the retries, we would turn off the port + * power to stop enumeration if the quirk is set. + */ + if (port_dev->quirks & USB_PORT_QUIRK_STOP_ENUM) { + usb_hub_set_port_power(hdev, hub, port1, false); + return true; + } + + return false; +} + /* Check if a port is power on */ int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus) { @@ -4855,6 +4877,9 @@ hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, buf->bMaxPacketSize0; kfree(buf); + if (r < 0 && (port_dev->quirks & USB_PORT_QUIRK_STOP_ENUM)) + goto fail; + retval = hub_port_reset(hub, port1, udev, delay, false); if (retval < 0) /* error or disconnect */ goto fail; @@ -5387,6 +5412,9 @@ static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, if ((status == -ENOTCONN) || (status == -ENOTSUPP)) break; + if (hub_port_stop_enumerate(hub, port1, i)) + break; + /* When halfway through our retry count, power-cycle the port */ if (i == (PORT_INIT_TRIES - 1) / 2) { dev_info(&port_dev->dev, "attempt power cycle\n"); @@ -5934,6 +5962,9 @@ static int usb_reset_and_verify_device(struct usb_device *udev) ret = hub_port_init(parent_hub, udev, port1, i); if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) break; + + if (hub_port_stop_enumerate(parent_hub, port1, i)) + goto stop_enumerate; } mutex_unlock(hcd->address0_mutex); @@ -6022,6 +6053,8 @@ static int usb_reset_and_verify_device(struct usb_device *udev) udev->bos = bos; return 0; +stop_enumerate: + mutex_unlock(hcd->address0_mutex); re_enumerate: usb_release_bos_descriptor(udev); udev->bos = bos; diff --git a/include/linux/usb.h b/include/linux/usb.h index f7a9914fc97f..fc0fef58c706 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -490,6 +490,9 @@ enum usb_port_connect_type { /* Decrease TRSTRCY to 10ms during device enumeration. */ #define USB_PORT_QUIRK_FAST_ENUM BIT(1) +/* Stop the enumeration for the given port if there are too many failures*/ +#define USB_PORT_QUIRK_STOP_ENUM BIT(2) + /* * USB 2.0 Link Power Management (LPM) parameters. */