From mboxrd@z Thu Jan 1 00:00:00 1970 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4257AC433F5 for ; Fri, 1 Oct 2021 02:55:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2022061A65 for ; Fri, 1 Oct 2021 02:55:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351792AbhJAC4y (ORCPT ); Thu, 30 Sep 2021 22:56:54 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:47058 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230346AbhJAC4y (ORCPT ); Thu, 30 Sep 2021 22:56:54 -0400 Received: from pyrite.rasen.tech (unknown [IPv6:2400:4051:61:600:2c71:1b79:d06d:5032]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 28204A16; Fri, 1 Oct 2021 04:55:06 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1633056909; bh=N++zTWxSrtp9ofCmT8OyqPTKrlS35/MpjrOqkscElsU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=oejvh8xTXH/vh1hYjLlL5JkYVz+n1QYoS0iDoJ5VWyvNrx93qnlNjigkjkYvIbO7j 4KYSNJfJ7xy6MjSQMI+EcaaiSpOt7CHrBbdGtxiSJPkP15aXsNMvDg1EfyFfPuKns4 VdeRmO4dtFGx9aA2FslqVW2v4QPtOpVSLjFv/2pM= Date: Fri, 1 Oct 2021 11:54:59 +0900 From: paul.elder@ideasonboard.com To: Michael Grzeschik Cc: linux-usb@vger.kernel.org, balbi@kernel.org, laurent.pinchart@ideasonboard.com, kernel@pengutronix.de, caleb.connolly@ideasonboard.com Subject: Re: [PATCH 4/7] usb: gadget: uvc: only schedule stream in streaming state Message-ID: <20211001025459.GD3032473@pyrite.rasen.tech> References: <20210930102717.15720-1-m.grzeschik@pengutronix.de> <20210930102717.15720-5-m.grzeschik@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210930102717.15720-5-m.grzeschik@pengutronix.de> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi Michael, On Thu, Sep 30, 2021 at 12:27:14PM +0200, Michael Grzeschik wrote: > This patch ensures that the video pump thread will only be scheduled if > the uvc is really in streaming state. This way the worker will not have > to run on an empty queue. > > Signed-off-by: Michael Grzeschik Reviewed-by: Paul Elder > --- > drivers/usb/gadget/function/uvc_v4l2.c | 3 ++- > drivers/usb/gadget/function/uvc_video.c | 4 +++- > 2 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c > index 4ca89eab61590..67922b1355e69 100644 > --- a/drivers/usb/gadget/function/uvc_v4l2.c > +++ b/drivers/usb/gadget/function/uvc_v4l2.c > @@ -169,7 +169,8 @@ uvc_v4l2_qbuf(struct file *file, void *fh, struct v4l2_buffer *b) > if (ret < 0) > return ret; > > - schedule_work(&video->pump); > + if (uvc->state == UVC_STATE_STREAMING) > + schedule_work(&video->pump); > > return ret; > } > diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c > index cdfd3726a86ae..ccee35177411d 100644 > --- a/drivers/usb/gadget/function/uvc_video.c > +++ b/drivers/usb/gadget/function/uvc_video.c > @@ -215,6 +215,7 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) > struct uvc_request *ureq = req->context; > struct uvc_video *video = ureq->video; > struct uvc_video_queue *queue = &video->queue; > + struct uvc_device *uvc = video->uvc; > unsigned long flags; > > switch (req->status) { > @@ -237,7 +238,8 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req) > list_add_tail(&req->list, &video->req_free); > spin_unlock_irqrestore(&video->req_lock, flags); > > - schedule_work(&video->pump); > + if (uvc->state == UVC_STATE_STREAMING) > + schedule_work(&video->pump); > } > > static int > -- > 2.30.2 >