usb: musb: fix gadget state on disconnect

commit 67a59f8 upstream.

When unplugging the USB cable or disconnecting a gadget in usb peripheral mode with
echo "" > /sys/kernel/config/usb_gadget/<your_gadget>/UDC,
/sys/class/udc/musb-hdrc.0/state does not change from USB_STATE_CONFIGURED.

Testing on dwc2/3 shows they both update the state to USB_STATE_NOTATTACHED.

Add calls to usb_gadget_set_state in musb_g_disconnect and musb_gadget_stop
to fix both cases.

Fixes: 49401f4 ("usb: gadget: introduce gadget state tracking")
Cc: stable@vger.kernel.org
Co-authored-by: Yehowshua Immanuel <yehowshua.immanuel@twosixtech.com>
Signed-off-by: Yehowshua Immanuel <yehowshua.immanuel@twosixtech.com>
Signed-off-by: Drew Hamilton <drew.hamilton@zetier.com>
Link: https://lore.kernel.org/r/20250701154126.8543-1-drew.hamilton@zetier.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: 2 people

drivers/usb/musb/musb_gadget.c

@@ -1912,6 +1912,7 @@ static int musb_gadget_stop(struct usb_gadget *g)
 	 * gadget driver here and have everything work;
 	 * that currently misbehaves.
 	 */
+	usb_gadget_set_state(g, USB_STATE_NOTATTACHED);
 
 	/* Force check of devctl register for PM runtime */
 	pm_runtime_mark_last_busy(musb->controller);
@@ -2018,6 +2019,7 @@ void musb_g_disconnect(struct musb *musb)
 	case OTG_STATE_B_PERIPHERAL:
 	case OTG_STATE_B_IDLE:
 		musb_set_state(musb, OTG_STATE_B_IDLE);
+		usb_gadget_set_state(&musb->g, USB_STATE_NOTATTACHED);
 		break;
 	case OTG_STATE_B_SRP_INIT:
 		break;