usb: dwc3: ep0: Fix delay status handling

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>

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index cc816142eb95e4ea83558e772f37abe50c680b87..1f29a6abeb194c4e16b3883d58c6f5777386cade 100644 (file)
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -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]);
 }