From patchwork Mon Sep 11 14:05:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 13379677 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 2D8C2EE57DF for ; Mon, 11 Sep 2023 20:48:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235086AbjIKUsg (ORCPT ); Mon, 11 Sep 2023 16:48:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43054 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238838AbjIKOFt (ORCPT ); Mon, 11 Sep 2023 10:05:49 -0400 Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6585EE5F for ; Mon, 11 Sep 2023 07:05:44 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qfhXq-0006o9-KU; Mon, 11 Sep 2023 16:05:42 +0200 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1qfhXq-005ZVD-7p; Mon, 11 Sep 2023 16:05:42 +0200 Received: from mgr by dude04.red.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1qfhXp-002tVb-0r; Mon, 11 Sep 2023 16:05:41 +0200 From: Michael Grzeschik To: laurent.pinchart@ideasonboard.com Cc: linux-usb@vger.kernel.org, linux-media@vger.kernel.org, dan.scally@ideasonboard.com, gregkh@linuxfoundation.org, nicolas@ndufresne.ca, kernel@pengutronix.de Subject: [PATCH v2 1/3] usb: gadget: uvc: stop pump thread on video disable Date: Mon, 11 Sep 2023 16:05:28 +0200 Message-Id: <20230911140530.2995138-2-m.grzeschik@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230911140530.2995138-1-m.grzeschik@pengutronix.de> References: <20230911140530.2995138-1-m.grzeschik@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mgr@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-media@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Since the uvc-video gadget driver is using the v4l2 interface, the streamon and streamoff can be triggered at any times. To ensure that the pump worker will be closed as soon the userspace is calling streamoff we synchronize the state of the gadget ensuring the pump worker to bail out. Signed-off-by: Michael Grzeschik --- v1 -> v2: Fixed the missing uvc variable in uvcg_video_enable drivers/usb/gadget/function/uvc_video.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index 91af3b1ef0d412..4b68a3a9815d73 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -384,13 +384,14 @@ static void uvcg_video_pump(struct work_struct *work) struct uvc_video_queue *queue = &video->queue; /* video->max_payload_size is only set when using bulk transfer */ bool is_bulk = video->max_payload_size; + struct uvc_device *uvc = video->uvc; struct usb_request *req = NULL; struct uvc_buffer *buf; unsigned long flags; bool buf_done; int ret; - while (video->ep->enabled) { + while (video->ep->enabled && uvc->state == UVC_STATE_STREAMING) { /* * Retrieve the first available USB request, protected by the * request lock. @@ -488,6 +489,7 @@ static void uvcg_video_pump(struct work_struct *work) */ int uvcg_video_enable(struct uvc_video *video, int enable) { + struct uvc_device *uvc = video->uvc; unsigned int i; int ret; @@ -498,6 +500,8 @@ int uvcg_video_enable(struct uvc_video *video, int enable) } if (!enable) { + uvc->state = UVC_STATE_CONNECTED; + cancel_work_sync(&video->pump); uvcg_queue_cancel(&video->queue, 0); @@ -523,6 +527,8 @@ int uvcg_video_enable(struct uvc_video *video, int enable) video->encode = video->queue.use_sg ? uvc_video_encode_isoc_sg : uvc_video_encode_isoc; + uvc->state = UVC_STATE_STREAMING; + video->req_int_count = 0; queue_work(video->async_wq, &video->pump);