Store the ring's last segment pointer and number of segments for ring
expansion usage.
Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx>
---
drivers/usb/host/xhci-mem.c | 2 ++
drivers/usb/host/xhci.h | 2 ++
2 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 42a22b8..e794c87 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -164,6 +164,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
if (!ring)
return NULL;
+ ring->num_segs = num_segs;
INIT_LIST_HEAD(&ring->td_list);
if (num_segs == 0)
return ring;
@@ -186,6 +187,7 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
num_segs--;
}
xhci_link_segments(xhci, prev, ring->first_seg, link_trbs, isoc);
+ ring->last_seg = prev;
if (link_trbs) {
/* See section 4.9.2.1 and 6.4.4.1 */
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 3c8fbd2..a7f3d23 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1256,6 +1256,7 @@ struct xhci_dequeue_state {
struct xhci_ring {
struct xhci_segment *first_seg;
+ struct xhci_segment *last_seg;
union xhci_trb *enqueue;
struct xhci_segment *enq_seg;
unsigned int enq_updates;
@@ -1270,6 +1271,7 @@ struct xhci_ring {
*/
u32 cycle_state;
unsigned int stream_id;
+ unsigned int num_segs;
bool last_td_was_short;
};
--
1.7.4.1
--
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