BACKPORT: usb: dwc3: gadget: Bail out in pullup if soft reset timeout happens

If the core soft reset timeout happens, avoid setting up event
buffers and starting gadget as the writes to these registers
may not reflect when in reset and setting the run stop bit
can lead the controller to access wrong event buffer address
resulting in a crash.

Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230510075252.31023-2-quic_kriskura@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 284900975
(cherry picked from commit 813f44d57e
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/ usb
-next)

Change-Id: I01373b098b7e576931d61815fe07373c1185b556
Signed-off-by: Uttkarsh Aggarwal <quic_uaggarwa@quicinc.com>

drivers/usb/dwc3/gadget.c

@@ -2604,13 +2604,16 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
 		 * device-initiated disconnect requires a core soft reset
 		 * (DCTL.CSftRst) before enabling the run/stop bit.
 		 */
-		dwc3_core_soft_reset(dwc);
+		ret = dwc3_core_soft_reset(dwc);
+		if (ret)
+			goto done;
 
 		dwc3_event_buffers_setup(dwc);
 		__dwc3_gadget_start(dwc);
 		ret = dwc3_gadget_run_stop(dwc, true, false);
 	}
 
+done:
 	pm_runtime_put(dwc->dev);
 
 	return ret;