transfer() schedules a rescan for transfers larger than
maxpacket, which is wrong for transfers that are multiples
of maxpacket.
Rewrite to fix and clarify packet multiple / remainder
transfer logic.
Signed-off-by: Igor Kotrasinski <i.kotrasinsk@xxxxxxxxxxx>
---
drivers/usb/gadget/udc/dummy_hcd.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index da38475..2ecec06a 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -1320,12 +1320,15 @@ top:
if (len == 0)
break;
- /* use an extra pass for the final short packet */
- if (len > ep->ep.maxpacket) {
- rescan = 1;
- len -= (len % ep->ep.maxpacket);
+ /* send multiple of maxpacket first, then remainder */
+ if (len >= ep->ep.maxpacket) {
+ is_short = 0;
+ if (len % ep->ep.maxpacket)
+ rescan = 1;
+ len -= len % ep->ep.maxpacket;
+ } else {
+ is_short = 1;
}
- is_short = (len % ep->ep.maxpacket) != 0;
len = dummy_perform_transfer(urb, req, len);
--
1.9.1
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