Merge "xhci: Fix NULL pointer dereference with xhci_irq() for shared_hcd"

	/* Only halt host and free memory after both hcds are removed */

	if (!usb_hcd_is_primary_hcd(hcd)) {

		/* usb core will free this hcd shortly, unset pointer */

		xhci->shared_hcd = NULL;

		mutex_unlock(&xhci->mutex);

		return;

	}