On Sun, 2016-07-03 at 21:59 +0200, Bjørn Mork wrote:
> default:
> @@ -200,10 +200,29 @@ static void wdm_in_callback(struct urb *urb)
> desc->reslength = length;
> }
> }
> +
> + /*
> + * If desc->resp_count is unset, then the urb was submitted
> + * without a prior notification. If the device returned any
> + * data, then this implies that it had messages queued without
> + * notifying us. Continue reading until that queue is flushed.
> + */
> + if (!desc->resp_count) {
> + if (!length) {
> + /* do not propagate the expected -EPIPE */
> + desc->rerr = 0;
> + goto unlock;
> + }
> + dev_dbg(&desc->intf->dev, "got %d bytes without notification\n", length);
> + set_bit(WDM_RESPONDING, &desc->flags);
> + usb_submit_urb(desc->response, GFP_ATOMIC);
You must check for being in an overflow condition.
> + }
> +
> skip_error:
> wake_up(&desc->wait);
>
> set_bit(WDM_READ, &desc->flags);
> +unlock:
> spin_unlock(&desc->iuspin);
> }
>
> @@ -647,6 +666,16 @@ static int wdm_open(struct inode *inode, struct file *file)
If you go for that approack you also need to do it
in resume()
Regards
Oliver
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