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>
This commit is contained in:
Родитель
b06d2f20cd
Коммит
239c25b1a0
|
@ -532,7 +532,7 @@ static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
|
||||||
*/
|
*/
|
||||||
UART_CLEAR_IER(uart, ETBEI);
|
UART_CLEAR_IER(uart, ETBEI);
|
||||||
uart->port.icount.tx += uart->tx_count;
|
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);
|
xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
|
||||||
|
|
||||||
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
||||||
|
|
Загрузка…
Ссылка в новой задаче