From: Stefan Bigler <stefan.bigler@xxxxxxxxxxx>
Some usb serial host drivers expect a short packet before they forward
the data to the application. This is caused by them trying to read more
than one packet at a time. So when the gadget sends an exact multiple
of the maximum packet size, it should append a zero-length packet.
The gadget driver for fsl_qe was not handling this case correctly.
See also commit 2e25134122c25ebb0679b4bbd536fb46c669f9d7
Signed-off-by: Stefan Bigler <stefan.bigler@xxxxxxxxxxx>
Signed-off-by: Holger Brunck <holger.brunck@xxxxxxxxxxx>
---
drivers/usb/gadget/fsl_qe_udc.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/gadget/fsl_qe_udc.c b/drivers/usb/gadget/fsl_qe_udc.c
index 7881f12..94daecc 100644
--- a/drivers/usb/gadget/fsl_qe_udc.c
+++ b/drivers/usb/gadget/fsl_qe_udc.c
@@ -1224,9 +1224,10 @@ static int frame_create_tx(struct qe_ep *ep, struct qe_frame *frame)
if (req == NULL)
return -ENODEV;
- if ((req->req.length - ep->sent) > 0)
+ if (req->req.length > 0)
reval = qe_usb_senddata(ep, frame);
- else
+
+ if (req->req.zero)
reval = sendnulldata(ep, frame, 0);
return reval;
--
1.7.0.5
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