From patchwork Sat Sep 30 18:48:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avichal Rakesh X-Patchwork-Id: 13405186 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E71E138E for ; Sat, 30 Sep 2023 18:48:33 +0000 (UTC) Received: from mail-yw1-x1149.google.com (mail-yw1-x1149.google.com [IPv6:2607:f8b0:4864:20::1149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7FFFE1 for ; Sat, 30 Sep 2023 11:48:31 -0700 (PDT) Received: by mail-yw1-x1149.google.com with SMTP id 00721157ae682-59f8188b718so192531157b3.1 for ; Sat, 30 Sep 2023 11:48:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696099711; x=1696704511; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=yVUNhv8Ca4Bneo2huWLmhKm4bUNhRAbGx7sDL56KZmE=; b=dn3jzL6UBvfdgT9ODHHBwGjuRi5jo/Qg9SAmRMCPoND7jdzfrDXUxpBRezyUyO1OGI pkPxAWPoiNYTz4t+mFpUvxLz245ILtM3OdO6r8HBAkA1zuYmJBHuS+DrXJUC6jPh/CcJ LuiEI3eQMvq1DvQtTvpIxAByi2LuAqHG5yiDf8MHGrWAaRMksEnEvn5GbEsq8jh8hDNf ffc6w0ZSBEGoKXUNF3NdQ1YlVzCDDWJlC8kuFhtiBd9CWIwjXq1mXPzdSZ6kojZJTaWU PvUI9V53D1qfcG2bHodz3kjKsUSOcark9mvPOpUSU28tO3THWnEkqlCpaQMTaWHeXnyM buvw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696099711; x=1696704511; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=yVUNhv8Ca4Bneo2huWLmhKm4bUNhRAbGx7sDL56KZmE=; b=cDeVfvcYuTgLRBnwFW0Axd3KUafH5Br5fGfCDTUVoJGQwonTP1Wh0fSHrr1HeeLLOF 45gABpN7/vaES+FtwSpgqR7uGB8Yd5fUnDhfqCuyp5cD79DmnB4aVdKjPysscdjtkOZy u8uveatRBly+KimWX5SOAmvWxNg8DlrZgQST7j9SPVUjaV2HDgSRRvrkXXQNQU8Xj3vg o94NSiqA+lg4OC1MlwQDXI8FhNy3XU55UdRMH4gNSlPd4AC220y0iHaMG3AWeGiPh4ZP 4pmI3uFMLrZxZd5LaZujFCAn9LoFRicFssXpAzBbxUzzjoIQCAwtgn6YRry5pmaPsc07 IhUg== X-Gm-Message-State: AOJu0YwDhXPGht0X1sQuQA7/KcKMXDEtJ4V0DN3TGV1nCrXfw8++tAWi xPtwYNTKAyNMhG5kUl8WyWit4RVVEC+o X-Google-Smtp-Source: AGHT+IH2JL4Oo3hXmwpi/7cv9ZKyYjENj1pnLNMUL0gqAEOjFbEGxjST1e6xqKTlnkxrjBsDeJB818mCYTdt X-Received: from hi-h2o-specialist.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:3cef]) (user=arakesh job=sendgmr) by 2002:a25:6f82:0:b0:d81:43c7:61ed with SMTP id k124-20020a256f82000000b00d8143c761edmr121329ybc.5.1696099711011; Sat, 30 Sep 2023 11:48:31 -0700 (PDT) Date: Sat, 30 Sep 2023 11:48:19 -0700 In-Reply-To: <20230930184821.310143-1-arakesh@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230930184821.310143-1-arakesh@google.com> X-Mailer: git-send-email 2.42.0.582.g8ccd20d70d-goog Message-ID: <20230930184821.310143-2-arakesh@google.com> Subject: [PATCH v1 1/3] usb: gadget: uvc: prevent use of disabled endpoint From: Avichal Rakesh To: Laurent Pinchart , Daniel Scally , Greg Kroah-Hartman , Michael Grzeschik Cc: jchowdhary@google.com, etalvala@google.com, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Avichal Rakesh X-Spam-Status: No, score=-9.6 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Currently the set_alt callback immediately disables the endpoint and queues the v4l2 streamoff event. However, as the streamoff event is processed asynchronously, it is possible that the video_pump thread attempts to queue requests to an already disabled endpoint. This change moves disabling usb endpoint to the end of streamoff event callback. As the endpoint's state can no longer be used, video_pump is now guarded by uvc->state as well. To be consistent with the actual streaming state, uvc->state is now toggled between CONNECTED and STREAMING from the v4l2 event callback only. Link: https://lore.kernel.org/20230615171558.GK741@pendragon.ideasonboard.com/ Link: https://lore.kernel.org/20230531085544.253363-1-dan.scally@ideasonboard.com/ Signed-off-by: Avichal Rakesh --- drivers/usb/gadget/function/f_uvc.c | 11 +++++------ drivers/usb/gadget/function/f_uvc.h | 2 +- drivers/usb/gadget/function/uvc.h | 2 +- drivers/usb/gadget/function/uvc_v4l2.c | 21 ++++++++++++++++++--- drivers/usb/gadget/function/uvc_video.c | 3 ++- 5 files changed, 27 insertions(+), 12 deletions(-) diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c index faa398109431..75c9f9a3f884 100644 --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -263,10 +263,13 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl) return 0; } -void uvc_function_setup_continue(struct uvc_device *uvc) +void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep) { struct usb_composite_dev *cdev = uvc->func.config->cdev; + if (disable_ep && uvc->video.ep) { + usb_ep_disable(uvc->video.ep); + } usb_composite_setup_continue(cdev); } @@ -337,15 +340,11 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt) if (uvc->state != UVC_STATE_STREAMING) return 0; - if (uvc->video.ep) - usb_ep_disable(uvc->video.ep); - memset(&v4l2_event, 0, sizeof(v4l2_event)); v4l2_event.type = UVC_EVENT_STREAMOFF; v4l2_event_queue(&uvc->vdev, &v4l2_event); - uvc->state = UVC_STATE_CONNECTED; - return 0; + return USB_GADGET_DELAYED_STATUS; case 1: if (uvc->state != UVC_STATE_CONNECTED) diff --git a/drivers/usb/gadget/function/f_uvc.h b/drivers/usb/gadget/function/f_uvc.h index 1db972d4beeb..e7f9f13f14dc 100644 --- a/drivers/usb/gadget/function/f_uvc.h +++ b/drivers/usb/gadget/function/f_uvc.h @@ -11,7 +11,7 @@ struct uvc_device; -void uvc_function_setup_continue(struct uvc_device *uvc); +void uvc_function_setup_continue(struct uvc_device *uvc, int disale_ep); void uvc_function_connect(struct uvc_device *uvc); diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h index 6751de8b63ad..989bc6b4e93d 100644 --- a/drivers/usb/gadget/function/uvc.h +++ b/drivers/usb/gadget/function/uvc.h @@ -177,7 +177,7 @@ struct uvc_file_handle { * Functions */ -extern void uvc_function_setup_continue(struct uvc_device *uvc); +extern void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep); extern void uvc_function_connect(struct uvc_device *uvc); extern void uvc_function_disconnect(struct uvc_device *uvc); diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c index 3f0a9795c0d4..3d3469883ed0 100644 --- a/drivers/usb/gadget/function/uvc_v4l2.c +++ b/drivers/usb/gadget/function/uvc_v4l2.c @@ -451,7 +451,7 @@ uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type) * Complete the alternate setting selection setup phase now that * userspace is ready to provide video frames. */ - uvc_function_setup_continue(uvc); + uvc_function_setup_continue(uvc, 0); uvc->state = UVC_STATE_STREAMING; return 0; @@ -463,11 +463,19 @@ uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type) struct video_device *vdev = video_devdata(file); struct uvc_device *uvc = video_get_drvdata(vdev); struct uvc_video *video = &uvc->video; + int ret = 0; if (type != video->queue.queue.type) return -EINVAL; - return uvcg_video_enable(video, 0); + uvc->state = UVC_STATE_CONNECTED; + ret = uvcg_video_enable(video, 0); + if (ret < 0) { + return ret; + } + + uvc_function_setup_continue(uvc, 1); + return 0; } static int @@ -500,6 +508,14 @@ uvc_v4l2_subscribe_event(struct v4l2_fh *fh, static void uvc_v4l2_disable(struct uvc_device *uvc) { uvc_function_disconnect(uvc); + if (uvc->state == UVC_STATE_STREAMING) { + /* + * Drop uvc->state to CONNECTED if it was streaming before. + * This ensures that the usb_requests are no longer queued + * to the controller. + */ + uvc->state = UVC_STATE_CONNECTED; + } uvcg_video_enable(&uvc->video, 0); uvcg_free_buffers(&uvc->video.queue); uvc->func_connected = false; @@ -647,4 +663,3 @@ const struct v4l2_file_operations uvc_v4l2_fops = { .get_unmapped_area = uvcg_v4l2_get_unmapped_area, #endif }; - diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index 91af3b1ef0d4..70ff88854539 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -382,6 +382,7 @@ static void uvcg_video_pump(struct work_struct *work) { struct uvc_video *video = container_of(work, struct uvc_video, pump); struct uvc_video_queue *queue = &video->queue; + struct uvc_device *uvc = video->uvc; /* video->max_payload_size is only set when using bulk transfer */ bool is_bulk = video->max_payload_size; struct usb_request *req = NULL; @@ -390,7 +391,7 @@ static void uvcg_video_pump(struct work_struct *work) bool buf_done; int ret; - while (video->ep->enabled) { + while (uvc->state == UVC_STATE_STREAMING && video->ep->enabled) { /* * Retrieve the first available USB request, protected by the * request lock.