--- linux-2.6.10/drivers/serial/au1x00_uart.c	2004-12-31 10:16:15.000000000 +0300
+++ linux-2.6.10/drivers/serial/au1x00_uart.c	2005-02-07 15:42:42.000000000 +0300
@@ -320,7 +320,9 @@
 	ignore_char:
 		*status = serial_inp(up, UART_LSR);
 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
+	spin_unlock(&up->port.lock);
 	tty_flip_buffer_push(tty);
+	spin_lock(&up->port.lock);
 }
 
 static _INLINE_ void transmit_chars(struct uart_8250_port *up)
--- linux-2.6.10/drivers/serial/8250.c	2005-02-07 13:47:57.000000000 +0300
+++ linux-2.6.10/drivers/serial/8250.c	2005-02-07 15:43:47.000000000 +0300
@@ -1059,7 +1059,9 @@
 	ignore_char:
 		lsr = serial_inp(up, UART_LSR);
 	} while ((lsr & UART_LSR_DR) && (max_count-- > 0));
+	spin_unlock(&up->port.lock);
 	tty_flip_buffer_push(tty);
+	spin_lock(&up->port.lock);
 	*status = lsr;
 }