From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alan Cox Subject: [PATCH 13/30] Fix DMA rx ring buffer handling Date: Tue, 24 Mar 2009 14:03:57 +0000 Message-ID: <20090324140352.12735.70438.stgit@localhost.localdomain> References: <20090324135930.12735.7827.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:48956 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1758264AbZCXODd (ORCPT ); Tue, 24 Mar 2009 10:03:33 -0400 In-Reply-To: <20090324135930.12735.7827.stgit@localhost.localdomain> Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, torvalds@linux-foundation.org From: Sonic Zhang Reported-by: Qian Zhang Signed-off-by: Sonic Zhang Signed-off-by: Bryan Wu Signed-off-by: Alan Cox --- drivers/serial/bfin_5xx.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 1e08e36..371a62f 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -401,9 +401,11 @@ static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart) else flg = TTY_NORMAL; - for (i = uart->rx_dma_buf.tail; i != uart->rx_dma_buf.head; i++) { + for (i = uart->rx_dma_buf.tail; ; i++) { if (i >= UART_XMIT_SIZE) i = 0; + if (i == uart->rx_dma_buf.head) + break; if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i])) uart_insert_char(&uart->port, status, OE, uart->rx_dma_buf.buf[i], flg);