From: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Date: Tue, 15 Sep 2015 14:55:29 +0000 (+0200)
Subject: usb: gadget: dummy_hcd: emulate sending zlp in packet logic
X-Git-Tag: omap-for-v4.3/fixes-rc5~79^2~11^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=21c3ee93867694e8c7382ff77b4645b50d3233e9;p=pandora-kernel.git

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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