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xhci: Update last segment pointer after Event Ring expansion

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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>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20231019102924.2797346-8-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2023-10-19 13:29:12 +03:00 • committed by Greg Kroah-Hartman
parent 35899f58fe
commit 67ab841a17
1 changed files with 7 additions and 5 deletions
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12
drivers/usb/host/xhci-mem.c
View file

@ -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;
}