linux-kernel - [PATCH 2/4] serial: bfin_uart: narrow the reboot condition in DMA tx interrupt

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Date:	Wed, 16 May 2012 14:22:24 +0800
From:	Sonic Zhang <sonic.adi@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-serial@...r.kernel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	<uclinux-dist-devel@...ckfin.uclinux.org>,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH 2/4] serial: bfin_uart: narrow the reboot condition in DMA tx interrupt

From: Sonic Zhang <sonic.zhang@...log.com>

Check if xmit buffer pointers are set to zero.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
---
 drivers/tty/serial/bfin_uart.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index 9acab11..56b95b0 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)
-- 
1.7.0.4


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