From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Executing
| testusb -a -c 1 -t 3 -v 421 -s 2048
does not complete on the gadget side.
g_zero enqueues a 4096 bytes long buffer. The host sends 2048bytes which
is a multiple of wMaxPacketSize (either 64 or 512 bytes). The host is
done with sending data but the gadget waits for more.
Since the protocol does not include transfer-length-field sending a
terminating zero packet seems the only way out.
Reviewed-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/misc/usbtest.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index bb10846..bd71500 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -359,8 +359,10 @@ static int simple_io(
urb->context = &completion;
while (retval == 0 && iterations-- > 0) {
init_completion(&completion);
- if (usb_pipeout(urb->pipe))
+ if (usb_pipeout(urb->pipe)) {
simple_fill_buf(urb);
+ urb->transfer_flags |= URB_ZERO_PACKET;
+ }
retval = usb_submit_urb(urb, GFP_KERNEL);
if (retval != 0)
break;
--
1.7.7
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