Revert "usb: gadget: u_serial: Disable ep before setting port to null to fix the crash caused by port being null"

commit 086fd062bc3883ae1ce4166cff5355db315ad879 upstream.

This reverts commit 13014969cbf07f18d62ceea40bd8ca8ec9d36cec.

It is reported to cause crashes on Tegra systems, so revert it for now.

Link: https://lore.kernel.org/r/[email protected]
Reported-by: Jon Hunter <[email protected]>
Cc: stable <[email protected]>
Cc: Lianqin Hu <[email protected]>
Link: https://lore.kernel.org/r/2025011711-yippee-fever-a737@gregkh
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/usb/gadget/function/u_serial.c

@@ -1393,10 +1393,6 @@ void gserial_disconnect(struct gserial *gser)
 	/* REVISIT as above: how best to track this? */
 	port->port_line_coding = gser->port_line_coding;
 
-	/* disable endpoints, aborting down any active I/O */
-	usb_ep_disable(gser->out);
-	usb_ep_disable(gser->in);
-
 	port->port_usb = NULL;
 	gser->ioport = NULL;
 	if (port->port.count > 0) {
@@ -1408,6 +1404,10 @@ void gserial_disconnect(struct gserial *gser)
 	spin_unlock(&port->port_lock);
 	spin_unlock_irqrestore(&serial_port_lock, flags);
 
+	/* disable endpoints, aborting down any active I/O */
+	usb_ep_disable(gser->out);
+	usb_ep_disable(gser->in);
+
 	/* finally, free any unused/unusable I/O buffers */
 	spin_lock_irqsave(&port->port_lock, flags);
 	if (port->port.count == 0)