linux-kernel - Re: [PATCH v3] usb: gadget: Add UDC driver for Aeroflex Gaisler GRUSBDC

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Date:	Thu, 12 Dec 2013 12:01:07 -0600
From:	Felipe Balbi <balbi@...com>
To:	Andreas Larsson <andreas@...sler.com>
CC:	Felipe Balbi <balbi@...com>, <linux-usb@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<software@...sler.com>
Subject: Re: [PATCH v3] usb: gadget: Add UDC driver for Aeroflex Gaisler
 GRUSBDC

Hi,

On Wed, Dec 04, 2013 at 09:13:58AM +0100, Andreas Larsson wrote:
> +static void gr_finish_request(struct gr_ep *ep, struct gr_request *req,
> +			      int status)
> +{
> +	struct gr_udc *dev;
> +
> +	list_del_init(&req->queue);
> +
> +	if (likely(req->req.status == -EINPROGRESS))
> +		req->req.status = status;
> +	else
> +		status = req->req.status;
> +
> +	dev = ep->dev;
> +	usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
> +	gr_free_dma_desc_chain(dev, req);
> +
> +	if (ep->is_in) /* For OUT, actual gets updated bit by bit */
> +		req->req.actual = req->req.length;
> +
> +	if (!status) {
> +		if (ep->is_in)
> +			gr_dbgprint_request("SENT", ep, req);
> +		else
> +			gr_dbgprint_request("RECV", ep, req);
> +	}
> +
> +	/* Prevent changes to ep->queue during callback */
> +	ep->callback = 1;
> +	if (req == dev->ep0reqo && !status) {
> +		if (req->setup)
> +			gr_ep0_setup(dev, req);
> +		else
> +			dev_err(dev->dev,
> +				"Unexpected non setup packet on ep0in\n");
> +	} else if (req->req.complete) {
> +		unsigned long flags;
> +
> +		/*
> +		 * Complete should be called with interrupts disabled according
> +		 * to the contract of struct usb_request
> +		 */
> +		local_irq_save(flags);

sorry but this driver isn't ready for inclusion. local_irq_save() is a
pretty good hint that there's something wrong in the driver. Consider
the fact that local_irq_save() will disable preemption even when
CONFIG_PREEMPT_FULL is enabled and you have a bit a problem.

Also, the way you're using thread IRQs is quite wrong. I can't let that
pass and get merged upstream, sorry.

-- 
balbi

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