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[209.132.180.67]) by mx.google.com with ESMTP id o5-v6si19112000pgk.300.2018.10.17.16.45.47; Wed, 17 Oct 2018 16:46:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass (test mode) header.i=@ideasonboard.com header.s=mail header.b=bRVHuRao; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727290AbeJRHnb (ORCPT + 99 others); Thu, 18 Oct 2018 03:43:31 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:42520 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726706AbeJRHnb (ORCPT ); Thu, 18 Oct 2018 03:43:31 -0400 Received: from avalon.localnet (dfj612ybrt5fhg77mgycy-3.rev.dnainternet.fi [IPv6:2001:14ba:21f5:5b00:2e86:4862:ef6a:2804]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D5E03113F; Thu, 18 Oct 2018 01:45:22 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1539819923; bh=nrgNSl6XnGW1dTnQwMWeMSvsVMrfnOUKXSDmJy4THAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bRVHuRaoTVln4fVvkmqMPPvi4SDqO5DvnjkV3+NOdQ2KWPJNnGVelF9QGMRxfL+OJ b1UsDw/t+ea0V637AyFxg93nsJagJYoexA4gBAsFWJK2t2dgn753HE6m1m1xpODRRV sJyxUYPoTYysJT8rjZ1b6tv3Dgc8nTd8X/fG2/ao= From: Laurent Pinchart To: Bin Liu Cc: Paul Elder , kieran.bingham@ideasonboard.com, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, balbi@kernel.org, stern@rowland.harvard.edu, rogerq@ti.com Subject: Re: [PATCH 4/6] usb: gadget: add functions to signal udc driver to delay status stage Date: Thu, 18 Oct 2018 02:45:32 +0300 Message-ID: <3055233.Lvy0NcWSZ5@avalon> Organization: Ideas on Board Oy In-Reply-To: <20181011161021.GB8763@uda0271908> References: <20181010024903.1633-1-paul.elder@ideasonboard.com> <20181010024903.1633-5-paul.elder@ideasonboard.com> <20181011161021.GB8763@uda0271908> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Bin, On Thursday, 11 October 2018 19:10:21 EEST Bin Liu wrote: > On Tue, Oct 09, 2018 at 10:49:01PM -0400, Paul Elder wrote: > > A usb gadget function driver may or may not want to delay the status > > stage of a control OUT request. An instance it might want to is to > > asynchronously validate the data of a class-specific request. > > > > Add a function usb_ep_delay_status to allow function drivers to choose > > to delay the status stage in the request completion handler. The UDC > > should then check the usb_ep->delayed_status flag and act accordingly to > > delay the status stage. > > > > Also add a function usb_ep_send_response as a wrapper for > > usb_ep->ops->send_response, whose prototype is added as well. This > > function should be called by function drivers to tell the UDC what to > > reply in the status stage that it has requested to be delayed. > > > > Signed-off-by: Paul Elder > > Reviewed-by: Laurent Pinchart > > --- > > > > drivers/usb/gadget/udc/core.c | 35 +++++++++++++++++++++++++++++++++++ > > include/linux/usb/gadget.h | 11 +++++++++++ > > 2 files changed, 46 insertions(+) > > > > diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c > > index af88b48c1cea..1ec5ce6b43cd 100644 > > --- a/drivers/usb/gadget/udc/core.c > > +++ b/drivers/usb/gadget/udc/core.c > > @@ -443,6 +443,41 @@ void usb_ep_fifo_flush(struct usb_ep *ep) > > } > > EXPORT_SYMBOL_GPL(usb_ep_fifo_flush); > > > > +/** > > + * usb_ep_ep_delay_status - set delay_status flag > > + * @ep: the endpoint whose delay_status flag is being set > > + * > > + * This function instructs the UDC to delay the status stage of a control > > + * request. It can only be called from the request completion handler of > > a > > + * control request. > > + */ > > +void usb_ep_delay_status(struct usb_ep *ep) > > +{ > > + ep->delayed_status = true; > > +} > > +EXPORT_SYMBOL_GPL(usb_ep_delay_status); > > Is usb_ep_set_delay_status() better? I thought it implies get/return > action if a verb is missing in the function name. For what it's worth, I understand the function name as "delay the status stage", with "delay" being a verb. Maybe the short description could be updated accordingly. -- Regards, Laurent Pinchart