diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index d7b2716..12b11da 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -401,9 +401,11 @@
 	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);