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SubjectRe: [PATCH v3] usb: gadget: Add UDC driver for Aeroflex Gaisler GRUSBDC
On 2013-12-12 19:01, Felipe Balbi wrote:
> 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.

This connection between local_irq_save and CONFIG_PREEMPT_RT_FULL was
unknown to me. Sure, I can disable interrupts right at spin lock time.


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

What is quite wrong? What is it that I need to fix?


Best regards,
Andreas Larsson



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