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usb: dwc3: ep0: correct cache sync issue in case of ep0_bounced

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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>
This commit is contained in:
Pratyush Anand 2012-08-10 13:42:16 +05:30 committed by Felipe Balbi
parent ea0e627623
commit 0416e494ce
2 changed files with 5 additions and 3 deletions
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1
drivers/usb/dwc3/ep0.c
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@ -720,7 +720,6 @@ static void dwc3_ep0_complete_data(struct dwc3 *dwc,
transferred = min_t(u32, ur->length,
transfer_size - length);
memcpy(ur->buf, dwc->ep0_bounce, transferred);
dwc->ep0_bounced = false;
} else {
transferred = ur->length - length;
}

7
drivers/usb/dwc3/gadget.c
View File

@ -263,8 +263,11 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
if (req->request.status == -EINPROGRESS)
req->request.status = status;
usb_gadget_unmap_request(&dwc->gadget, &req->request,
req->direction);
if (dwc->ep0_bounced && dep->number == 0)
dwc->ep0_bounced = false;
else
usb_gadget_unmap_request(&dwc->gadget, &req->request,
req->direction);
dev_dbg(dwc->dev, "request %p from %s completed %d/%d ===> %d\n",
req, dep->name, req->request.actual,