[S390] cio: Use locks when accessing /sys/firmware/cpi data.

[cascardo/linux.git] / drivers / s390 / char / tty3270.c

diff --git a/drivers/s390/char/tty3270.c b/drivers/s390/char/tty3270.c
index 70b1980..5043150 100644 (file)
--- a/drivers/s390/char/tty3270.c
+++ b/drivers/s390/char/tty3270.c
@@ -965,8 +965,7 @@ tty3270_write_room(struct tty_struct *tty)
  * Insert character into the screen at the current position with the
  * current color and highlight. This function does NOT do cursor movement.
  */
-static void
-tty3270_put_character(struct tty3270 *tp, char ch)
+static void tty3270_put_character(struct tty3270 *tp, char ch)
 {
        struct tty3270_line *line;
        struct tty3270_cell *cell;
@@ -1611,16 +1610,15 @@ tty3270_write(struct tty_struct * tty,
 /*
  * Put single characters to the ttys character buffer
  */
-static void
-tty3270_put_char(struct tty_struct *tty, unsigned char ch)
+static int tty3270_put_char(struct tty_struct *tty, unsigned char ch)
 {
        struct tty3270 *tp;
 
        tp = tty->driver_data;
-       if (!tp)
-               return;
-       if (tp->char_count < TTY3270_CHAR_BUF_SIZE)
-               tp->char_buf[tp->char_count++] = ch;
+       if (!tp || tp->char_count >= TTY3270_CHAR_BUF_SIZE)
+               return 0;
+       tp->char_buf[tp->char_count++] = ch;
+       return 1;
 }
 
 /*