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Commit 239c25b1 authored by Sonic Zhang's avatar Sonic Zhang Committed by Greg Kroah-Hartman
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serial: bfin_uart: narrow the reboot condition in DMA tx interrupt 



Check if xmit buffer pointers are set to zero.

Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b06d2f20

drivers/tty/serial/bfin_uart.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -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)