[PATCH 5.15.y 2/2] usb: musb: fix gadget state on disconnect

[Sasha Levin <sashal@kernel.org>]

From: Drew Hamilton <drew.hamilton@zetier.com>

[ Upstream commit 67a59f82196c8c4f50c83329f0577acfb1349b50 ]

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: 49401f4169c0 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/musb/musb_gadget.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 78b12b034cd6f..b941a45124359 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1909,6 +1909,7 @@ 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 */
 	schedule_delayed_work(&musb->irq_work, 0);
@@ -2017,6 +2018,7 @@ 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;
-- 
2.39.5