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-rw-r--r--drivers/char/tty_io.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index a27160ba21d..daeb8f76697 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2498,7 +2498,7 @@ static int tiocgwinsz(struct tty_struct *tty, struct winsize __user *arg)
/**
* tty_do_resize - resize event
* @tty: tty being resized
- * @real_tty: real tty (if using a pty/tty pair)
+ * @real_tty: real tty (not the same as tty if using a pty/tty pair)
* @rows: rows (character)
* @cols: cols (character)
*
@@ -2512,7 +2512,8 @@ int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
struct pid *pgrp, *rpgrp;
unsigned long flags;
- mutex_lock(&tty->termios_mutex);
+ /* For a PTY we need to lock the tty side */
+ mutex_lock(&real_tty->termios_mutex);
if (!memcmp(ws, &tty->winsize, sizeof(*ws)))
goto done;
/* Get the PID values and reference them so we can
@@ -2533,7 +2534,7 @@ int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
tty->winsize = *ws;
real_tty->winsize = *ws;
done:
- mutex_unlock(&tty->termios_mutex);
+ mutex_unlock(&real_tty->termios_mutex);
return 0;
}