Ring expansion checker may incorrectly assume a completely full ring is empty, missing the need for expansion.

This is due to a special empty ring case where the dequeue ends up ahead of the enqueue pointer. This is seen when enqueued TRBs fill up exactly a segment, with enqueue then pointing to the end link TRB. Once those TRBs are handled the dequeue pointer will follow the link TRB and end up pointing to the first entry on the next segment, past the enqueue.

This same enqueue - dequeue condition can be true if a ring is full, with enqueue ending on that last link TRB before the dequeue pointer on the next segment.

This can be seen when queuing several ~510 small URBs via usbfs in one go before a single one is handled (i.e. dequeue not moved from first entry in segment).

Expand the ring already when enqueue reaches the link TRB before the dequeue segment, instead of expanding it when enqueue moves into the dequeue segment.

Reported-by: Chris Yokum linux-usb@mail.totalphase.com Closes: https://lore.kernel.org/all/949223224.833962.1709339266739.JavaMail.zimbra@t... Tested-by: Chris Yokum linux-usb@mail.totalphase.com Fixes: f5af638f0609 ("xhci: Fix transfer ring expansion size calculation") Cc: stable@vger.kernel.org # v6.5+ Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com --- drivers/usb/host/xhci-ring.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index f0d8a607ff21..4f64b814d4aa 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -326,7 +326,13 @@ static unsigned int xhci_ring_expansion_needed(struct xhci_hcd *xhci, struct xhc /* how many trbs will be queued past the enqueue segment? */ trbs_past_seg = enq_used + num_trbs - (TRBS_PER_SEGMENT - 1);

- if (trbs_past_seg <= 0) + /* + * Consider expanding the ring already if num_trbs fills the current + * segment (i.e. trbs_past_seg == 0), not only when num_trbs goes into + * the next segment. Avoids confusing full ring with special empty ring + * case below + */ + if (trbs_past_seg < 0) return 0;

/* Empty ring special case, enqueue stuck on link trb while dequeue advanced */