From patchwork Wed Apr 5 09:31:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 13201478 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 A1CBCC77B62 for ; Wed, 5 Apr 2023 09:32:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237682AbjDEJcn (ORCPT ); Wed, 5 Apr 2023 05:32:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237788AbjDEJc1 (ORCPT ); Wed, 5 Apr 2023 05:32:27 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDCD15BAB for ; Wed, 5 Apr 2023 02:31:50 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 204-20020a250fd5000000b00b6d6655dc35so34552157ybp.6 for ; Wed, 05 Apr 2023 02:31:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; t=1680687096; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=yBhMce5MJnmp23KM1dsJQjjtpNOxg2YPVBV4k7AdjEQ=; b=aKsY5zNFDmGcT2oLevWC/U6nVR8VVMOStPWNb4b9XzcOaVjjp+bwM1RXUgrG4WynDQ EAxvcUnxeK8linTrOHXJ23Neiwz4JAipa8sCiG5FwsjKyZnSg4nLhAAeeHaeGvIkyxBN 0vxBwJODeOm8+XNgsAemb9wyJOCmS1+BVmwQwIj7dxnUwF+JhVy0qD0yKI1q8aiR2Bfp BqOqXQFOrEOccYY5wWn/4RG6V5hIFL7gced4oTznR9QP98pyNMjTO50nnFeJpqBjnJWN tHmMzJjz+MdOldH4zur6+Mfj77JQM81yJGOVtkzG2xueaSaWjstQgEmhlCbHFgtozBqT 4ihA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1680687096; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=yBhMce5MJnmp23KM1dsJQjjtpNOxg2YPVBV4k7AdjEQ=; b=CiJpxnrqXGVpA8dpx7E7kgRPNTVA7Gpomg2epBJ/542YA32NWbgxCOTkMHSuzo+FH7 vSnG3vWkAPgGHt7DQ4CR3jH1mCVkkYWX6Clx/BcwklmhCjlKXe64QThWCjdfVjf3SVuu 0kk1gqWSH330OH04m6SBc8uoj274toA/NcaoM567LYyPAjx8seUlPSU5zMFzHyfDprhF eA6DEo7+4Sf6SWBVZ9OPbkTj+s14Y91QT4tBvejR8PFsaeW2tzzzt2cfaM0EOyPhzp8P g74cgGE0u+9K3UfN1yrlMlP7/piWug/k4egG7fQra5aosbi8jykF9vMyAIrfhp0mWHLU gbeA== X-Gm-Message-State: AAQBX9ezxXtVsy/DGHcD4gZlYZ/GkYwvge1JA1+WJ04RteJJYKEFxq8Z k8tAkC7GFdbJSJI3w0UeIQ3UE9saQVE= X-Google-Smtp-Source: AKy350Z65mkS+F6+obV9zcmrHvkJXQkjOz7M3BWVH07O3xO+HLMKQCcCFv7crfTnz3r+DFRozrmh0MeyTAw= X-Received: from badhri.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:6442]) (user=badhri job=sendgmr) by 2002:a25:da4e:0:b0:a02:a3a6:78fa with SMTP id n75-20020a25da4e000000b00a02a3a678famr3137102ybf.12.1680687096140; Wed, 05 Apr 2023 02:31:36 -0700 (PDT) Date: Wed, 5 Apr 2023 09:31:32 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.40.0.348.gf938b09366-goog Message-ID: <20230405093133.1858140-1-badhri@google.com> Subject: [PATCH v1 1/2] usb: gadget: udc: core: Invoke usb_gadget_connect only when started From: Badhri Jagan Sridharan To: gregkh@linuxfoundation.org, stern@rowland.harvard.edu, colin.i.king@gmail.com, xuetao09@huawei.com, quic_eserrao@quicinc.com, water.zhangjiantao@huawei.com, peter.chen@freescale.com, balbi@ti.com Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org usb_udc_connect_control does not check to see if the udc has already been started. This causes gadget->ops->pullup to be called through usb_gadget_connect when invoked from usb_udc_vbus_handler even before usb_gadget_udc_start is called. Guard this by checking for udc->started in usb_udc_connect_control before invoking usb_gadget_connect. Guarding udc_connect_control, udc->started and udc->vbus with its own mutex as usb_udc_connect_control_locked can be simulataneously invoked from different code paths. Cc: stable@vger.kernel.org Signed-off-by: Badhri Jagan Sridharan Fixes: 628ef0d273a6 ("usb: udc: add usb_udc_vbus_handler") --- drivers/usb/gadget/udc/core.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) base-commit: d629c0e221cd99198b843d8351a0a9bfec6c0423 diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 3dcbba739db6..890f92cb6344 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -56,6 +56,8 @@ static LIST_HEAD(udc_list); /* Protects udc_list, udc->driver, driver->is_bound, and related calls */ static DEFINE_MUTEX(udc_lock); +/* Protects udc->vbus, udc-started and udc_connect_control_locked */ +static DEFINE_MUTEX(udc_connect_control_lock); /* ------------------------------------------------------------------------- */ /** @@ -1078,9 +1080,10 @@ EXPORT_SYMBOL_GPL(usb_gadget_set_state); /* ------------------------------------------------------------------------- */ -static void usb_udc_connect_control(struct usb_udc *udc) +/* Acquire udc_connect_control_lock before calling this function. */ +static void usb_udc_connect_control_locked(struct usb_udc *udc) { - if (udc->vbus) + if (udc->vbus && udc->started) usb_gadget_connect(udc->gadget); else usb_gadget_disconnect(udc->gadget); @@ -1099,10 +1102,12 @@ void usb_udc_vbus_handler(struct usb_gadget *gadget, bool status) { struct usb_udc *udc = gadget->udc; + mutex_lock(&udc_connect_control_lock); if (udc) { udc->vbus = status; - usb_udc_connect_control(udc); + usb_udc_connect_control_locked(udc); } + mutex_unlock(&udc_connect_control_lock); } EXPORT_SYMBOL_GPL(usb_udc_vbus_handler); @@ -1140,14 +1145,18 @@ static inline int usb_gadget_udc_start(struct usb_udc *udc) { int ret; + mutex_lock(&udc_connect_control_lock); if (udc->started) { dev_err(&udc->dev, "UDC had already started\n"); + mutex_unlock(&udc_connect_control_lock); return -EBUSY; } ret = udc->gadget->ops->udc_start(udc->gadget, udc->driver); if (!ret) udc->started = true; + usb_udc_connect_control_locked(udc); + mutex_unlock(&udc_connect_control_lock); return ret; } @@ -1165,13 +1174,17 @@ static inline int usb_gadget_udc_start(struct usb_udc *udc) */ static inline void usb_gadget_udc_stop(struct usb_udc *udc) { + mutex_lock(&udc_connect_control_lock); if (!udc->started) { dev_err(&udc->dev, "UDC had already stopped\n"); + mutex_unlock(&udc_connect_control_lock); return; } udc->gadget->ops->udc_stop(udc->gadget); udc->started = false; + usb_udc_connect_control_locked(udc); + mutex_unlock(&udc_connect_control_lock); } /** @@ -1527,7 +1540,6 @@ static int gadget_bind_driver(struct device *dev) if (ret) goto err_start; usb_gadget_enable_async_callbacks(udc); - usb_udc_connect_control(udc); kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE); return 0;