[patch] small tty irq race fix

[Nicolas Pitre]

--- linux-2.5.63/drivers/char/tty_io.c.orig	Mon Feb 24 14:05:34 2003
+++ linux-2.5.63/drivers/char/tty_io.c	Mon Mar  3 13:02:31 2003
@@ -1947,17 +1947,17 @@
 	if (tty->flip.buf_num) {
 		cp = tty->flip.char_buf + TTY_FLIPBUF_SIZE;
 		fp = tty->flip.flag_buf + TTY_FLIPBUF_SIZE;
-		tty->flip.buf_num = 0;
 
 		local_irq_save(flags); // FIXME: is this safe?
+		tty->flip.buf_num = 0;
 		tty->flip.char_buf_ptr = tty->flip.char_buf;
 		tty->flip.flag_buf_ptr = tty->flip.flag_buf;
 	} else {
 		cp = tty->flip.char_buf;
 		fp = tty->flip.flag_buf;
-		tty->flip.buf_num = 1;
 
 		local_irq_save(flags); // FIXME: is this safe?
+		tty->flip.buf_num = 1;
 		tty->flip.char_buf_ptr = tty->flip.char_buf + TTY_FLIPBUF_SIZE;
 		tty->flip.flag_buf_ptr = tty->flip.flag_buf + TTY_FLIPBUF_SIZE;
 	}

Nicolas