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xhci: add helper that checks for unhandled events on a event ring

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Add unhandled_event_trb() that returns true in case xHC hardware has
written new event trbs to the event ring that driver has not yet handled.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20240217001017.29969-8-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2024-02-16 16:09:33 -08:00 committed by Greg Kroah-Hartman
parent 84ac5e4fa5
commit fbaf1889a3
1 changed files with 8 additions and 3 deletions
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11
drivers/usb/host/xhci-ring.c
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@ -113,6 +113,12 @@ static bool last_td_in_urb(struct xhci_td *td)
return urb_priv->num_tds_done == urb_priv->num_tds;
}
static bool unhandled_event_trb(struct xhci_ring *ring)
{
return ((le32_to_cpu(ring->dequeue->event_cmd.flags) & TRB_CYCLE) ==
ring->cycle_state);
}
static void inc_td_cnt(struct urb *urb)
{
struct urb_priv *urb_priv = urb->hcpriv;
@ -2973,9 +2979,8 @@ static int xhci_handle_event(struct xhci_hcd *xhci, struct xhci_interrupter *ir)
}
event = ir->event_ring->dequeue;
/* Does the HC or OS own the TRB? */
if ((le32_to_cpu(event->event_cmd.flags) & TRB_CYCLE) !=
ir->event_ring->cycle_state)
if (!unhandled_event_trb(ir->event_ring))
return 0;
trace_xhci_handle_event(ir->event_ring, &event->generic);