[PATCH 1/4] serial: usbtty: Send urb data in correct order

["Pali Rohár" <pali@kernel.org>]

Function next_urb() selects the last urb data buffer from linked list to
which next data from usbtty puts should be appended.

But to check if TX data still exists it is needed to look at the first urb
data buffer from linked list. So check for endpoint->tx_urb (first from the
linked list) instead of current_urb (the last from the linked list).

Successful call to udc_endpoint_write() may invalidate active urb and
allocate new in queue which invalidate pointer returned by next_urb()
function.

So call next_urb() prior putting data into urb buffer and call it every
time after using udc_endpoint_write() function to prevent sending data from
usbtty puts in incorrect order.

This patch fixes issue that usbtty code does not transmit data when they
are waiting in the tx queue.

Signed-off-by: Pali Roh?r <pali@kernel.org>
---
 drivers/serial/usbtty.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c
index 02f8edf200..4f4eb02de0 100644
--- a/drivers/serial/usbtty.c
+++ b/drivers/serial/usbtty.c
@@ -849,17 +849,9 @@ static int write_buffer (circbuf_t * buf)
 			&endpoint_instance[tx_endpoint];
 	struct urb *current_urb = NULL;
 
-	current_urb = next_urb (device_instance, endpoint);
-
-	if (!current_urb) {
-		TTYERR ("current_urb is NULL, buf->size %d\n",
-		buf->size);
-		return 0;
-	}
-
 	/* TX data still exists - send it now
 	 */
-	if(endpoint->sent < current_urb->actual_length){
+	if(endpoint->sent < endpoint->tx_urb->actual_length){
 		if(udc_endpoint_write (endpoint)){
 			/* Write pre-empted by RX */
 			return -1;
@@ -878,6 +870,8 @@ static int write_buffer (circbuf_t * buf)
 		 */
 		while (buf->size > 0) {
 
+			current_urb = next_urb (device_instance, endpoint);
+
 			dest = (char*)current_urb->buffer +
 				current_urb->actual_length;
 
-- 
2.20.1