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usb: dwc3: gadget: early giveback if End Transfer already completed

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There is a rare race condition that may happen during a Disconnect
Interrupt if we have a started request that happens to be
dequeued *after* completion of End Transfer command. If that happens,
that request will be left waiting for completion of an End Transfer
command that will never happen.

If End Transfer command has already completed before, we are safe to
giveback the request straight away.

Tested-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2019-01-21 13:01:16 +02:00
parent 974a1368c3
commit 9f45581f5e
1 changed files with 5 additions and 1 deletions
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6
drivers/usb/dwc3/gadget.c
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@ -1550,7 +1550,10 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
goto out0;
dwc3_gadget_move_cancelled_request(req);
goto out0;
if (dep->flags & DWC3_EP_TRANSFER_STARTED)
goto out0;
else
goto out1;
}
dev_err(dwc->dev, "request %pK was not queued to %s\n",
request, ep->name);
@ -1558,6 +1561,7 @@ static int dwc3_gadget_ep_dequeue(struct usb_ep *ep,
goto out0;
}
out1:
dwc3_gadget_giveback(dep, req, -ECONNRESET);
out0: