[PATCH 2/4] usb: gadget: dummy_hcd: fix false overflow on bounded IN

[Igor Skalkin]

In transfer(), the IN short-packet path reports -EOVERFLOW when
dev_len > host_len.

For IN transfers this is a valid bounded completion: the host asked for
host_len bytes and the transfer is limited by the host buffer. It is not
an overflow condition.

Treat bounded IN short completion as success.

This fixes spurious failures in usbtest bulk IN varying-length cases.

Assisted-by: OpenCode:claude-sonnet-5
Signed-off-by: Igor Skalkin <igor.skalkin@xxxxxxxxxxxxxxxx>
---
 drivers/usb/gadget/udc/dummy_hcd.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index 29f671c7b319..5384806347ab 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -1486,11 +1486,13 @@ static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
 				req->req.status = 0;
 				*status = 0;
 			} else if (to_host) {
+				/*
+				 * Host requested fewer bytes than the gadget
+				 * request currently has pending. This is a
+				 * normal bounded IN transfer, not overflow.
+				 */
 				req->req.status = 0;
-				if (dev_len > host_len)
-					*status = -EOVERFLOW;
-				else
-					*status = 0;
+				*status = 0;
 			} else {
 				*status = 0;
 				if (host_len > dev_len)
-- 
2.49.0