[PATCH] serial_core.h needs sched.h

In file included from drivers/misc/ibmasm/uart.c:27:
include/linux/serial_core.h: In function `uart_handle_dcd_change':
include/linux/serial_core.h:407: `TASK_INTERRUPTIBLE' undeclared (first use in this function)

include/linux/serial_core.h

@@ -84,6 +84,7 @@
 #include <linux/interrupt.h>
 #include <linux/circ_buf.h>
 #include <linux/spinlock.h>
+#include <linux/sched.h>
 
 struct uart_port;
 struct uart_info;