linux-kernel - Re: [PATCH v4 1/3] usb: gadget: Refactor request completion

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Message-ID: <Pine.LNX.4.44L0.1408271701560.1460-100000@iolanthe.rowland.org>
Date:	Wed, 27 Aug 2014 17:03:41 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Michal Sojka <sojka@...ica.cz>
cc:	linux-usb@...r.kernel.org, Bryan Wu <cooloney@...il.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux LED Subsystem <linux-leds@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <michal.vokac@...ap.cz>
Subject: Re: [PATCH v4 1/3] usb: gadget: Refactor request completion

On Wed, 27 Aug 2014, Michal Sojka wrote:

> +/**
> + * usb_gadget_giveback_request - give the request back to the gadget layer
> + * Context: in_interrupt()
> + *
> + * This is called by device controller drivers in order to return the
> + * completed request back to the gadget layer.
> + */
> +void usb_gadget_giveback_request(struct usb_ep *ep,
> +		struct usb_request *req)
> +{
> +	BUG_ON(req->complete == NULL);
> +	req->complete(ep, req);
> +}

I guess it doesn't hurt to have the BUG_ON, but it doesn't help either.  
Think about what would happen if req->complete was NULL and the BUG_ON 
wasn't present.

Alan Stern

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