[Blackfin] serial driver: Fix bug serial driver in DMA mode spams history to console on shell restart

http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=2920
Fix by increasing buffer tail immediately before starting tx dma.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 838f491c8deb..007414639e32 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -411,6 +411,10 @@ static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
         set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
         set_dma_x_modify(uart->tx_dma_channel, 1);
         enable_dma(uart->tx_dma_channel);
+
+        xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
+        uart->port.icount.tx += uart->tx_count;
+
 #ifdef CONFIG_BF54x
         UART_SET_IER(uart, ETBEI);
 #else
@@ -502,9 +506,6 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
                 ier &= ~ETBEI;
                 UART_PUT_IER(uart, ier);
 #endif
-                xmit->tail = (xmit->tail+uart->tx_count) &(UART_XMIT_SIZE -1);
-                uart->port.icount.tx+=uart->tx_count;
-
                 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
                         uart_write_wakeup(&uart->port);