From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sonic Zhang Subject: [PATCH 2/4] serial: bfin_uart: narrow the reboot condition in DMA tx interrupt Date: Wed, 16 May 2012 14:22:24 +0800 Message-ID: <1337149346-5277-2-git-send-email-sonic.adi@gmail.com> References: <1337149346-5277-1-git-send-email-sonic.adi@gmail.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from tx2ehsobe004.messaging.microsoft.com ([65.55.88.14]:7723 "EHLO tx2outboundpool.messaging.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755584Ab2EPGdY (ORCPT ); Wed, 16 May 2012 02:33:24 -0400 In-Reply-To: <1337149346-5277-1-git-send-email-sonic.adi@gmail.com> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: Greg Kroah-Hartman , linux-serial@vger.kernel.org Cc: LKML , uclinux-dist-devel@blackfin.uclinux.org, Sonic Zhang From: Sonic Zhang Check if xmit buffer pointers are set to zero. Signed-off-by: Sonic Zhang --- 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