This patch avoids setting the URB_ZERO_PACKET transfer flag for synchronous
data. This is needed to prevent the host from sending an empty packet when
data is aligned to an endpoint packet boundary.
Signed-off-by: Christian Gromm <christian.gromm@xxxxxxxxxxxxx>
---
drivers/staging/most/usb/usb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/most/usb/usb.c b/drivers/staging/most/usb/usb.c
index 3126b69..d102b08 100644
--- a/drivers/staging/most/usb/usb.c
+++ b/drivers/staging/most/usb/usb.c
@@ -592,7 +592,8 @@ static int hdm_enqueue(struct most_interface *iface, int channel,
length,
hdm_write_completion,
mbo);
- if (conf->data_type != MOST_CH_ISOC)
+ if (conf->data_type != MOST_CH_ISOC &&
+ conf->data_type != MOST_CH_SYNC)
urb->transfer_flags |= URB_ZERO_PACKET;
} else {
usb_fill_bulk_urb(urb, mdev->usb_device,
--
2.7.4
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