diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2024-02-17 03:09:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-02-17 18:24:37 +0300 |
| commit | fbaf1889a30f8564f1450acec8e48f5b967fb184 (patch) | |
| tree | 31a87f606d87e3e4de9ae0a85d9886abd8eb5cbb /drivers/usb/host | |
| parent | 84ac5e4fa517f5d1da0054547a82ce905678dc08 (diff) | |
| download | linux-fbaf1889a30f8564f1450acec8e48f5b967fb184.tar.xz | |
xhci: add helper that checks for unhandled events on a event ring
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>
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index ad008a5abc81..275164dc449d 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -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); |