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[19/21] usb: xhci: add 'goto' for halted endpoint check in handle_tx_event()

Message ID 20240626124835.1023046-20-mathias.nyman@linux.intel.com
State New
Headers show
Series [01/21] xhci: Remove dead code in xhci_move_dequeue_past_td() | expand

Commit Message

Mathias Nyman June 26, 2024, 12:48 p.m. UTC 
From: Niklas Neronin <niklas.neronin@linux.intel.com>

Add 'goto' statement for a halted endpoint, streamlining the error
handling process. In future handle_tx_event() changes this 'goto'
statement will have more uses.

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 | 33 +++++++++++++++++----------------
 1 file changed, 17 insertions(+), 16 deletions(-)

Comments

Michal Pecio Aug. 2, 2024, 9:21 a.m. UTC | #1 
Hi,

This commit has now landed in 6.11-r1 and it appears to have a side
effect of performing the halted endpoint check after every handled
event, which wasn't done before.

>+	/* update the urb's actual_length and give back to the core */
>+	if (usb_endpoint_xfer_control(&td->urb->ep->desc))
>+		process_ctrl_td(xhci, ep, ep_ring, td, ep_trb, event);
>+	else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
>+		process_isoc_td(xhci, ep, ep_ring, td, ep_trb, event);
>+	else
>+		process_bulk_intr_td(xhci, ep, ep_ring, td, ep_trb, event);
>+
>+check_endpoint_halted:
>+	if (xhci_halted_host_endpoint(ep_ctx, trb_comp_code))
>+		xhci_handle_halted_endpoint(xhci, ep, td, EP_HARD_RESET);
> 
> 	return 0;

Since stall handling is already present in functions like finish_td() or
process_bulk_intr_td() called from the above snippet, and this change of
behavior is not documented in the changelog, I doubt if it's intended?

Regards,
Michal
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index d037d3bbc767..49f8f980776b 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2788,10 +2788,9 @@  static int handle_tx_event(struct xhci_hcd *xhci,
 				xhci_dbg(xhci, "td_list is empty while skip flag set. Clear skip flag for slot %u ep %u.\n",
 					 slot_id, ep_index);
 			}
-			if (xhci_halted_host_endpoint(ep_ctx, trb_comp_code))
-				xhci_handle_halted_endpoint(xhci, ep, NULL, EP_HARD_RESET);
 
-			return 0;
+			td = NULL;
+			goto check_endpoint_halted;
 		}
 
 		td = list_first_entry(&ep_ring->td_list, struct xhci_td,
@@ -2899,20 +2898,22 @@  static int handle_tx_event(struct xhci_hcd *xhci,
 	 * indefinitely.
 	 */
 
-	if (trb_is_noop(ep_trb)) {
-		if (xhci_halted_host_endpoint(ep_ctx, trb_comp_code))
-			xhci_handle_halted_endpoint(xhci, ep, td, EP_HARD_RESET);
-	} else {
-		td->status = status;
+	if (trb_is_noop(ep_trb))
+		goto check_endpoint_halted;
 
-		/* update the urb's actual_length and give back to the core */
-		if (usb_endpoint_xfer_control(&td->urb->ep->desc))
-			process_ctrl_td(xhci, ep, ep_ring, td, ep_trb, event);
-		else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
-			process_isoc_td(xhci, ep, ep_ring, td, ep_trb, event);
-		else
-			process_bulk_intr_td(xhci, ep, ep_ring, td, ep_trb, event);
-	}
+	td->status = status;
+
+	/* update the urb's actual_length and give back to the core */
+	if (usb_endpoint_xfer_control(&td->urb->ep->desc))
+		process_ctrl_td(xhci, ep, ep_ring, td, ep_trb, event);
+	else if (usb_endpoint_xfer_isoc(&td->urb->ep->desc))
+		process_isoc_td(xhci, ep, ep_ring, td, ep_trb, event);
+	else
+		process_bulk_intr_td(xhci, ep, ep_ring, td, ep_trb, event);
+
+check_endpoint_halted:
+	if (xhci_halted_host_endpoint(ep_ctx, trb_comp_code))
+		xhci_handle_halted_endpoint(xhci, ep, td, EP_HARD_RESET);
 
 	return 0;