From: Daniel Glöckner <dg@xxxxxxxxx> 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. Signed-off-by: Daniel Glöckner <dg@xxxxxxxxx> Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/usb/gadget/u_serial.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c index 0a4d99a..fc6e709 100644 --- a/drivers/usb/gadget/u_serial.c +++ b/drivers/usb/gadget/u_serial.c @@ -371,6 +371,7 @@ __acquires(&port->port_lock) req->length = len; list_del(&req->list); + req->zero = (gs_buf_data_avail(&port->port_write_buf) == 0); pr_vdebug(PREFIX "%d: tx len=%d, 0x%02x 0x%02x 0x%02x ...\n", port->port_num, len, *((u8 *)req->buf), -- 1.6.3.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
