From patchwork Tue Oct 3 23:18:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Avichal Rakesh X-Patchwork-Id: 13408078 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 317F93F4D0 for ; Tue, 3 Oct 2023 23:19:12 +0000 (UTC) Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 132AC10E for ; Tue, 3 Oct 2023 16:19:02 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-d852a6749bcso1801542276.0 for ; Tue, 03 Oct 2023 16:19:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1696375141; x=1696979941; 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=ArVoPjwYMHkkpCMoH+/iCkmQnlykQeUcYYwAmxq8LD0=; b=WydiE7B3N+hxLrGCWv4r4W2+Hd07tS0rkcgTxOlIh7Keo6dQK21MkUankHbAc5gPHM yTxnTiLLsGXswPhpSHpS4YGFvuedVq451ocS1KZjVmrC7j5gvw/425UlojvMTGzg0/xs Et8+UBWiGq+zV+6OH4AWSd+E8Y7xruiXGkS3mF5N7ZY3cNFxBdoPqMZB1ccMvQoEeRfe LCykC8MARovqNllAv5cOU1+7CxbaH8w1h1uUV/K2NWXrKJVQ2JSPRnWWYhx1rRa1dQm8 jlyR3VFClwnKlS+OUqXzxL/RkXpdMiYDulE86FaODXDFtPpYxjbCyI+nqJyfbZV9uOh9 ln7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1696375141; x=1696979941; 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=ArVoPjwYMHkkpCMoH+/iCkmQnlykQeUcYYwAmxq8LD0=; b=vescC4jBSkgl81XRREkgDxCtKpktk3RUlLsnfZ/kaUaAjUFRJ9hQ3h4Kxt7wllDFbV LhSz5zfwbcIF3IwZIObHFPMtiIHXnx/azzX3lgozpRmm7mjL7eXvyp5q9zPoI1VeozLf p0oop8yK6wx00riaPl+mWVOf+9L/ggO4l7Qn9MsN4oeEp2yXEyw8CXi6WebqyJkZI/I/ KKaFLXpfeHXwwvivb7W4w3jdgiRfBRjXJLAG2qR87p/b7sgk2vaENjUsE4ozPbt5CnAp xt9GCroPoWKOIx0xyypS908TABruADGx8WWhlT5LNeLVyHIxBfUqg4vAIYTvm92bX0WN yjbg== X-Gm-Message-State: AOJu0YxYjtsTGbp5Y7V3YjiLmJHk5/i18M5UHUlWGJHoi9QFBVGxXmPO rJ3O9ja6ToRqx++RTw+GwF7x9NljMgwj X-Google-Smtp-Source: AGHT+IFSGzebqILp0IStIPy/7RKYqInAfboPET5jE6hqmI9IOEaPOwoqZFGZGSwEg2T7/Xb7Encqp+EjDHJG X-Received: from hi-h2o-specialist.c.googlers.com ([fda3:e722:ac3:cc00:24:72f4:c0a8:3cef]) (user=arakesh job=sendgmr) by 2002:a25:f816:0:b0:d84:e73f:6f8c with SMTP id u22-20020a25f816000000b00d84e73f6f8cmr9891ybd.6.1696375141136; Tue, 03 Oct 2023 16:19:01 -0700 (PDT) Date: Tue, 3 Oct 2023 16:18:56 -0700 In-Reply-To: <20230930184821.310143-2-arakesh@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230930184821.310143-2-arakesh@google.com> X-Mailer: git-send-email 2.42.0.582.g8ccd20d70d-goog Message-ID: <20231003231856.2591708-1-arakesh@google.com> Subject: [PATCH v2 1/3] usb: gadget: uvc: prevent use of disabled endpoint From: Avichal Rakesh To: arakesh@google.com, dan.scally@ideasonboard.com, gregkh@linuxfoundation.org, laurent.pinchart@ideasonboard.com, mgr@pengutronix.de Cc: etalvala@google.com, jchowdhary@google.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org 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. 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 --- v1 -> v2: Rebased to ToT and reworded commit message. 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 ++++++++++++++++++--- 4 files changed, 25 insertions(+), 11 deletions(-) -- 2.42.0.582.g8ccd20d70d-goog 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 }; -