tree 0244d954d2a2bc06b4ed4e44b1a11bb4370f6bb9
parent ec512fb8e5611fed1df2895f90317ce6797d6b32
author Amit Virdi <amit.virdi@st.com> 1421139441 +0530
committer Felipe Balbi <balbi@ti.com> 1421256545 -0600

usb: dwc3: gadget: Stop TRB preparation after limit is reached

DWC3 gadget sets up a pool of 32 TRBs for each EP during initialization. This
means, the max TRBs that can be submitted for an EP is fixed to 32. Since the
request queue for an EP is a linked list, any number of requests can be queued
to it by the gadget layer.  However, the dwc3 driver must not submit TRBs more
than the pool it has created for. This limit wasn't respected when SG was used
resulting in submitting more than the max TRBs, eventually leading to
non-transfer of the TRBs submitted over the max limit.

Root cause:
When SG is used, there are two loops iterating to prepare TRBs:
 - Outer loop over the request_list
 - Inner loop over the SG list
The code was missing break to get out of the outer loop.

Fixes: eeb720fb21d6 (usb: dwc3: gadget: add support for SG lists)
Cc: <stable@vger.kernel.org> # v3.9+
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>