linux kernel - xhci usb root hub polling

Question

In the hcd.c in the function usb_add_hcd() at the end I see there is a poll flag check.

    if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
        usb_hcd_poll_rh_status(hcd);

But no where the HCD_POLL_RH flag is set. So, my question is,

1. Is polling not used by xhci hc driver?
2. If not then how is the status of the root hub port checked?

question from:https://stackoverflow.com/questions/65839855/xhci-usb-root-hub-polling

Answer 1

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