usb: dwc3: ep0: correct cache sync issue in case of ep0_bounced
In case of ep0 out, if length is not aligned to maxpacket size then we use dwc->ep_bounce_addr for dma transfer and not request->dma. Since, we have alreday done memcpy from dwc->ep0_bounce to request->buf, so we do not need to issue cache sync function. In fact, cache sync function will bring wrong data in request->buf from request->dma in this scenario. So, cache sync function must not be executed in case of ep0 bounced. Cc: <stable@vger.kernel.org> # v3.4 v3.5 Signed-off-by: Pratyush Anand <pratyush.anand@st.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
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@ -720,7 +720,6 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
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transferred = min_t(u32, ur->length,
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transfer_size - length);
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memcpy(ur->buf, dwc->ep0_bounce, transferred);
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dwc->ep0_bounced = false;
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} else {
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transferred = ur->length - length;
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}
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@ -263,8 +263,11 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
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if (req->request.status == -EINPROGRESS)
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req->request.status = status;
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usb_gadget_unmap_request(&dwc->gadget, &req->request,
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req->direction);
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if (dwc->ep0_bounced && dep->number == 0)
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dwc->ep0_bounced = false;
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else
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usb_gadget_unmap_request(&dwc->gadget, &req->request,
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req->direction);
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dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
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req, dep->name, req->request.actual,
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