usb: dwc3: gadget: Fix handling ZLP

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The usb_request->zero doesn't apply for isoc. Also, if we prepare a
0-length (ZLP) TRB for the OUT direction, we need to prepare an extra
TRB to pad up to the MPS alignment. Use the same bounce buffer for the
ZLP TRB and the extra pad TRB.

Cc: <stable@vger.kernel.org> # v4.5+
Fixes: d6e5a549cc ("usb: dwc3: simplify ZLP handling")
Fixes: 04c03d10e5 ("usb: dwc3: gadget: handle request->zero")
Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>

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Thinh Nguyen 2020-08-06 19:46:29 -07:00 • committed by Felipe Balbi

parent 5d187c0454

commit d2ee3ff79e

1 changed files with 23 additions and 2 deletions

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drivers/usb/dwc3/gadget.c

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