From: Zhuang Jin Can <jin.can.zhuang@intel.com>
Date: Thu, 15 May 2014 21:57:57 +0000 (+0800)
Subject: usb: dwc3: gadget: check link trb after free_slot is increased
X-Git-Tag: omap-for-v3.16/fixes-rc4~20^2~9^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5cd8c48d95c10f729090c89757727e090719fd83;p=pandora-kernel.git

usb: dwc3: gadget: check link trb after free_slot is increased

In ISOC transfers, when free_slot points to the last TRB (i.e. Link
TRB), and all queued requests meet Missed Interval Isoc error, busy_slot
points to trb0.
	busy_slot->trb0
		   trb1
		   ...
	free_slot->trb31(Link TRB)

After end transfer and receiving the XferNotReady event, trb_left is
caculated as 1 which is wrong, and no TRB will be primed to the
endpoint.

The root cause is free_slot is not increased the same way as busy_slot.
When busy_slot is increased by one, it checks if points to a link TRB
after increasement, but free_slot checks it before increasement.
free_slot should behave the same as busy_slot to make the trb_left
caculation correct.

Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
Signed-off-by: Zhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: Jiebing Li <jiebing.li@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

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