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tty: Update code comment in __proc_set_tty()

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The session and foreground process group pid references will be
non-NULL if tiocsctty() is stealing the controlling tty from another
session (ie., arg == 1 in tiocsctty()).

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-10-16 14:59:50 -04:00 committed by Greg Kroah-Hartman
parent e218eb32f5
commit a361858da3
1 changed files with 4 additions and 1 deletions
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5
drivers/tty/tty_io.c
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@ -516,8 +516,11 @@ static void __proc_set_tty(struct tty_struct *tty)
{
unsigned long flags;
/* We should not have a session or pgrp to put here but.... */
spin_lock_irqsave(&tty->ctrl_lock, flags);
/*
* The session and fg pgrp references will be non-NULL if
* tiocsctty() is stealing the controlling tty
*/
put_pid(tty->session);
put_pid(tty->pgrp);
tty->pgrp = get_pid(task_pgrp(current));