diff mbox series

[v2,06/10] xhci: Update last segment pointer after Event Ring expansion

Message ID f2849ad55385886c8c0b98bd5de04daf970eefcb.1692892942.git.lukas@wunner.de
State New
Headers show
Series Multi-segment Event Ring support for XHCI | expand

Commit Message

Lukas Wunner Aug. 24, 2023, 4:15 p.m. UTC 
When expanding a ring at its "end", ring->last_seg needs to be updated
for Event Rings as well, not just for all the other ring types.

This is not a fix because ring expansion currently isn't done on the
Event Ring.  It's just in preparation for when it's added.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/usb/host/xhci-mem.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 1c0f5263cf81..d4123e6f2549 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -146,11 +146,13 @@  static void xhci_link_rings(struct xhci_hcd *xhci, struct xhci_ring *ring,
 	xhci_link_segments(last, next, ring->type, chain_links);
 	ring->num_segs += num_segs;
 
-	if (ring->type != TYPE_EVENT && ring->enq_seg == ring->last_seg) {
-		ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control
-			&= ~cpu_to_le32(LINK_TOGGLE);
-		last->trbs[TRBS_PER_SEGMENT-1].link.control
-			|= cpu_to_le32(LINK_TOGGLE);
+	if (ring->enq_seg == ring->last_seg) {
+		if (ring->type != TYPE_EVENT) {
+			ring->last_seg->trbs[TRBS_PER_SEGMENT-1].link.control
+				&= ~cpu_to_le32(LINK_TOGGLE);
+			last->trbs[TRBS_PER_SEGMENT-1].link.control
+				|= cpu_to_le32(LINK_TOGGLE);
+		}
 		ring->last_seg = last;
 	}