From 21c3ee93867694e8c7382ff77b4645b50d3233e9 Mon Sep 17 00:00:00 2001
From: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Date: Tue, 15 Sep 2015 16:55:29 +0200
Subject: [PATCH] usb: gadget: dummy_hcd: emulate sending zlp in packet logic

currently, when a zlp flag is set and an urb/usb_request
buffer is filled without a short packet, transfer() leaves
its status at -EINPROGRESS and does not rescan for short
packet.

In a scenario where ep.maxpacket bytes are copied,
URB_ZERO_PACKET is set, urb buffer is filled and usb_request
buffer is not, transfer() returns with an urb with
-EINPROGRESS status, which dummy_hcd treats as incomplete
transfer.

Check for zlp and rescan appropriately.

Signed-off-by: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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