serial: usbtty: Send urb data in correct order

Function next_urb() selects the last urb data buffer from linked list to
which next data from usbtty's puts function 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 urb in queue which invalidates 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's puts function 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 Rohár <pali@kernel.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Acked-by: Pavel Machek <pavel@ucw.cz>

diff --git a/drivers/serial/usbtty.c b/drivers/serial/usbtty.c
index 02f8edf200c8ce74e5c65cd3124014c1de23e95a..4f4eb02de08349e858fa7bbcaea1c161f158df08 100644 (file)
--- 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;