[PATCH 02/15] usb: xhci: remove redundant update_ring_for_set_deq_completion() function

Mathias Nyman
2025-03-06T14:49:28Z

From: Niklas Neronin <niklas.neronin@linux.intel.com>

The function is a remnant from a previous implementation and is now
redundant. There is no longer a need to search for the dequeue pointer,
as both the TRB and segment dequeue pointers are saved within
'queued_deq_seg' and 'queued_deq_ptr'.

Signed-off-by: Niklas Neronin <niklas.neronin@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
drivers/usb/host/xhci-ring.c | 41 ++----------------------------------
1 file changed, 2 insertions(+), 39 deletions(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 965bffce301e..23cf20026359 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1332,43 +1332,6 @@ void xhci_hc_died(struct xhci_hcd *xhci)
usb_hc_died(xhci_to_hcd(xhci));
}

-static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci,
- struct xhci_virt_device *dev,
- struct xhci_ring *ep_ring,
- unsigned int ep_index)
-{
- union xhci_trb *dequeue_temp;
-
- dequeue_temp = ep_ring->dequeue;
-
- /* If we get two back-to-back stalls, and the first stalled transfer
- * ends just before a link TRB, the dequeue pointer will be left on
- * the link TRB by the code in the while loop. So we have to update
- * the dequeue pointer one segment further, or we'll jump off
- * the segment into la-la-land.
- */
- if (trb_is_link(ep_ring->dequeue)) {
- ep_ring->deq_seg = ep_ring->deq_seg->next;
- ep_ring->dequeue = ep_ring->deq_seg->trbs;
- }
-
- while (ep_ring->dequeue != dev->eps[ep_index].queued_deq_ptr) {
- /* We have more usable TRBs */
- ep_ring->dequeue++;
- if (trb_is_link(ep_ring->dequeue)) {
- if (ep_ring->dequeue ==
- dev->eps[ep_index].queued_deq_ptr)
- break;
- ep_ring->deq_seg = ep_ring->deq_seg->next;
- ep_ring->dequeue = ep_ring->deq_seg->trbs;
- }
- if (ep_ring->dequeue == dequeue_temp) {
- xhci_dbg(xhci, "Unable to find new dequeue pointer\n");
- break;
- }
- }
-}
-
/*
* When we get a completion for a Set Transfer Ring Dequeue Pointer command,
* we need to clear the set deq pending flag in the endpoint ring state, so that
@@ -1473,8 +1436,8 @@ static void xhci_handle_cmd_set_deq(struct xhci_hcd *xhci, int slot_id,
/* Update the ring's dequeue segment and dequeue pointer
* to reflect the new position.
*/
- update_ring_for_set_deq_completion(xhci, ep->vdev,
- ep_ring, ep_index);
+ ep_ring->deq_seg = ep->queued_deq_seg;
+ ep_ring->dequeue = ep->queued_deq_ptr;
} else {
xhci_warn(xhci, "Mismatch between completed Set TR Deq Ptr command & xHCI internal state.\n");
xhci_warn(xhci, "ep deq seg = %p, deq ptr = %p\n",
--
2.43.0