From: Peter Hurley <peter@hurleysoftware.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Jiri Slaby <jslaby@suse.cz>,
One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Peter Hurley <peter@hurleysoftware.com>
Subject: [PATCH -next 10/10] tty: Update code comment in __proc_set_tty()
Date: Thu, 16 Oct 2014 14:59:50 -0400 [thread overview]
Message-ID: <1413485990-16855-11-git-send-email-peter@hurleysoftware.com> (raw)
In-Reply-To: <1413485990-16855-1-git-send-email-peter@hurleysoftware.com>
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>
---
drivers/tty/tty_io.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 7def510..e18491a 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -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));
--
2.1.1
next prev parent reply other threads:[~2014-10-16 18:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 18:59 [PATCH -next 00/10] Fixes to controlling tty handling Peter Hurley
2014-10-16 18:59 ` [PATCH -next 01/10] tty: Remove tty_pair_get_tty()/tty_pair_get_pty() api Peter Hurley
2014-10-16 18:59 ` [PATCH -next 02/10] tty: Reorder proc_set_tty() and related fns Peter Hurley
2014-10-16 18:59 ` [PATCH -next 03/10] tty: Remove tsk parameter from proc_set_tty() Peter Hurley
2014-10-16 18:59 ` [PATCH -next 04/10] uml: Fix unsafe pid reference to foreground process group Peter Hurley
2014-10-17 7:57 ` Richard Weinberger
2014-10-16 18:59 ` [PATCH -next 05/10] tty: Replace open-coded tty_get_pgrp() Peter Hurley
2014-10-16 18:59 ` [PATCH -next 06/10] tty: Remove !tty condition from __proc_set_tty() Peter Hurley
2014-10-16 18:59 ` [PATCH -next 07/10] tty: Fix multiple races when setting the controlling terminal Peter Hurley
2014-10-16 18:59 ` [PATCH -next 08/10] tty: Move session_of_pgrp() and make static Peter Hurley
2014-10-16 18:59 ` [PATCH -next 09/10] tty: Serialize proc_set_tty() with tty_lock Peter Hurley
2014-10-16 18:59 ` Peter Hurley [this message]
2014-10-22 15:00 ` [PATCH -next 00/10] Fixes to controlling tty handling One Thousand Gnomes
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