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staging: most: usb: don't set URB_ZERO_PACKET flag for synchronous data

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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@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2018-05-08 11:45:14 +02:00 committed by Greg Kroah-Hartman
parent d060bff70e
commit 9a32315b0b
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/most/usb/usb.c
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@ -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,