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authorSonic Zhang <sonic.zhang@analog.com>2012-05-16 14:22:24 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-17 13:25:56 -0700
commit239c25b1a03cf57193b9a52623deb918adf6132e (patch)
tree8ac6c54d5b5a15d8efef65c4f40caaa8bed18fdb /drivers/tty/serial
parentb06d2f20cdf57841b309d30d895b1fd502655e48 (diff)
downloadlinux-239c25b1a03cf57193b9a52623deb918adf6132e.tar.bz2
serial: bfin_uart: narrow the reboot condition in DMA tx interrupt
Check if xmit buffer pointers are set to zero. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r--drivers/tty/serial/bfin_uart.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 9acab114d804..56b95b0447d9 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -532,7 +532,7 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
*/
UART_CLEAR_IER(uart, ETBEI);
uart->port.icount.tx += uart->tx_count;
- if (!uart_circ_empty(xmit)) {
+ if (!(xmit->tail == 0 && xmit->head == 0)) {
xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)