[U-Boot] [PATCH 2/6] usb: ci_udc: don't assume QTDs are adjacent when transmitting ZLPs

[Stephen Warren]

From: Stephen Warren <swarren at nvidia.com>

Fix ci_ep_submit_next_request()'s ZLP transmission code to explicitly
call ci_get_qtd() to find the address of the other QTD to use. This
will allow us to correctly align each QTD individually in the future,
which may involve leaving a gap between the QTDs.

Signed-off-by: Stephen Warren <swarren at nvidia.com>
---
 drivers/usb/gadget/ci_udc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
index 8ba604841c47..4115cd5dab0f 100644
--- a/drivers/usb/gadget/ci_udc.c
+++ b/drivers/usb/gadget/ci_udc.c
@@ -404,10 +404,11 @@ static void ci_ep_submit_next_request(struct ci_ep *ci_ep)
 		 * only 1 is used at a time since either an IN or an OUT but
 		 * not both is queued. For an IN transaction, item currently
 		 * points at the second of these items, so we know that we
-		 * can use (item - 1) to transmit the extra zero-length packet
+		 * can use the other to transmit the extra zero-length packet.
 		 */
-		item->next = (unsigned)(item - 1);
-		item--;
+		struct ept_queue_item *other_item = ci_get_qtd(num, 0);
+		item->next = (unsigned)other_item;
+		item = other_item;
 		item->info = INFO_ACTIVE;
 	}
 
-- 
1.8.1.5