diff options
| author | Sonic Zhang <sonic.zhang@analog.com> | 2007-12-21 12:12:55 +0300 |
|---|---|---|
| committer | Bryan Wu <cooloney@kernel.org> | 2007-12-21 12:12:55 +0300 |
| commit | 99ee7b5f3a68324807650f650f2613bbe281627f (patch) | |
| tree | e9f8799f94026ae1be19ff0d5d144acb9fff3409 | |
| parent | 75b780bd99b851682289e7a88763ede5a936edb0 (diff) | |
| download | linux-99ee7b5f3a68324807650f650f2613bbe281627f.tar.xz | |
[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>
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 7 |
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); |