usb: dwc3: gadget: Synchronize IRQ between soft connect/disconnect

[ Upstream commit 9711c67de7482c81e1daca3548fbc5c9603600e3 ]

Ensure that there are no pending events being handled in between soft
connect/disconnect transitions.  As we are keeping interrupts enabled,
and EP0 events are still being serviced, this avoids any stale events from
being serviced.

Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20220817182359.13550-4-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: c8540870af4c ("usb: dwc3: gadget: Improve dwc3_gadget_suspend() and dwc3_gadget_resume()")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index d76a4837615d9f937815e0b4ddd8206f56c7986a..b2ffc98c9e7470f1016f58f219a096f99523f966 100644 (file)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2540,6 +2540,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
                return 0;
        }
 
+       synchronize_irq(dwc->irq_gadget);
+
        if (!is_on) {
                ret = dwc3_gadget_soft_disconnect(dwc);
        } else {