From: Thinh Nguyen Thinh.Nguyen@synopsys.com
commit fa27e2f6c5e674f3f1225f9ca7a7821faaf393bb 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: d97c78a1908e ("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
--- drivers/usb/dwc3/ep0.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -1058,10 +1058,11 @@ void dwc3_ep0_send_delayed_status(struct { 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]); }