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Commit 78c58a53 authored by Sebastian Andrzej Siewior's avatar Sebastian Andrzej Siewior Committed by Felipe Balbi
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usb: dwc3: gadget: do not map/unmap ZLP transfers 



If the gadget drivers sends a ZLP we are trying to map this this request
which does not work on all implementations. So we simply skip mapping
it.

Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 42077b0a

drivers/usb/dwc3/gadget.c

+10 −0
Original line number Diff line number Diff line
@@ -61,6 +61,11 @@ void dwc3_map_buffer_to_dma(struct dwc3_request *req) 
{

	struct dwc3			*dwc = req->dep->dwc;



	if (req->request.length == 0) {

		/* req->request.dma = dwc->setup_buf_addr; */

		return;

	}



	if (req->request.dma == DMA_ADDR_INVALID) {

		req->request.dma = dma_map_single(dwc->dev, req->request.buf,

				req->request.length, req->direction
@@ -78,6 +83,11 @@ void dwc3_unmap_buffer_from_dma(struct dwc3_request *req) 
{

	struct dwc3			*dwc = req->dep->dwc;



	if (req->request.length == 0) {

		req->request.dma = DMA_ADDR_INVALID;

		return;

	}



	if (req->mapped) {

		dma_unmap_single(dwc->dev, req->request.dma,

				req->request.length, req->direction