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usb: dwc3: gadget: delay unmap of bounced requests

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commit de288e36fe33f7e06fa272bc8e2f85aa386d99aa upstream.

In the case of bounced ep0 requests, we must delay DMA operation until
after ->complete() otherwise we might overwrite contents of req->buf.

This caused problems with RNDIS gadget.

Signed-off-by: Janusz Dziedzic <januszx.dziedzic@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Janusz Dziedzic 2017-03-13 14:11:32 +02:00 committed by Greg Kroah-Hartman
parent ee670af5fe
commit d9a97dcdf5
1 changed files with 17 additions and 4 deletions
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21
drivers/usb/dwc3/gadget.c
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@ -174,6 +174,7 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
int status)
{
struct dwc3 *dwc = dep->dwc;
unsigned int unmap_after_complete = false;
req->started = false;
list_del(&req->list);
@ -182,11 +183,19 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
if (req->request.status == -EINPROGRESS)
req->request.status = status;
if (dwc->ep0_bounced && dep->number <= 1)
/*
* NOTICE we don't want to unmap before calling ->complete() if we're
* dealing with a bounced ep0 request. If we unmap it here, we would end
* up overwritting the contents of req->buf and this could confuse the
* gadget driver.
*/
if (dwc->ep0_bounced && dep->number <= 1) {
dwc->ep0_bounced = false;
usb_gadget_unmap_request(&dwc->gadget, &req->request,
req->direction);
unmap_after_complete = true;
} else {
usb_gadget_unmap_request(&dwc->gadget,
&req->request, req->direction);
}
trace_dwc3_gadget_giveback(req);
@ -194,6 +203,10 @@ void dwc3_gadget_giveback(struct dwc3_ep *dep, struct dwc3_request *req,
usb_gadget_giveback_request(&dep->endpoint, &req->request);
spin_lock(&dwc->lock);
if (unmap_after_complete)
usb_gadget_unmap_request(&dwc->gadget,
&req->request, req->direction);
if (dep->number > 1)
pm_runtime_put(dwc->dev);
}