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xhci: expand next_trb() helper to support more ring types

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The next_trb() helper relies on a link TRB at the end of a ring segment
to know a segment ends. This works well with transfer rings that use
link trbs, but not with event rings.

Event rings segments are always filled by host to segment size
before moving to next segment. It does not use link TRBs

Check for both link trb and full segment in next_trb() helper to
support event rings.

Useful if several interrupters with several event rings are supported.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20231019102924.2797346-4-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2023-10-19 13:29:08 +03:00 committed by Greg Kroah-Hartman
parent 15626ba965
commit e2d3ac9cd9
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/xhci-ring.c
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@ -144,7 +144,7 @@ static void next_trb(struct xhci_hcd *xhci,
struct xhci_segment **seg,
union xhci_trb **trb)
{
if (trb_is_link(*trb)) {
if (trb_is_link(*trb) || last_trb_on_seg(*seg, *trb)) {
*seg = (*seg)->next;
*trb = ((*seg)->trbs);
} else {