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usb: dwc3: ep0: Fix delay status handling 

commit fa27e2f6c5 upstream.

If we want to send a control status on our own time (through
delayed_status), make sure to handle a case where we may queue the
delayed status before the host requesting for it (when XferNotReady
is generated). Otherwise, the driver won't send anything because it's
not EP0_STATUS_PHASE yet. To resolve this, regardless whether
dwc->ep0state is EP0_STATUS_PHASE, make sure to clear the
dwc->delayed_status flag if dwc3_ep0_send_delayed_status() is called.
The control status can be sent when the host requests it later.

Cc: <stable@vger.kernel.org>
Fixes: d97c78a190 ("usb: dwc3: gadget: END_TRANSFER before CLEAR_STALL command")
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Thinh Nguyen 2020-10-22 15:44:59 -07:00 committed by Greg Kroah-Hartman
parent 86875e1d64
commit 290fcf3e0c
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/dwc3/ep0.c
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@ -1058,10 +1058,11 @@ void dwc3_ep0_send_delayed_status(struct dwc3 *dwc)
{
unsigned int direction = !dwc->ep0_expect_in;
dwc->delayed_status = false;
if (dwc->ep0state != EP0_STATUS_PHASE)
return;
dwc->delayed_status = false;
__dwc3_ep0_do_control_status(dwc, dwc->eps[direction]);
}