[PATCH 1/1] Char: vt, make sysfs operations atomic

[Jiri Slaby <jirislaby@gmail.com>]

Hold console sem while creating/destroying sysfs files. Serialisation is
so far done by BKL held in tty release_dev and chrdev_open, but no other
locks are held in open path.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
---
 drivers/char/vt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index fa1ffbf..0043cff 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -2746,8 +2746,8 @@ static int con_open(struct tty_struct *tty, struct file *filp)
 				tty->termios->c_iflag |= IUTF8;
 			else
 				tty->termios->c_iflag &= ~IUTF8;
-			release_console_sem();
 			vcs_make_sysfs(tty);
+			release_console_sem();
 			return ret;
 		}
 	}
@@ -2772,8 +2772,8 @@ static void con_close(struct tty_struct *tty, struct file *filp)
 		if (vc)
 			vc->vc_tty = NULL;
 		tty->driver_data = NULL;
-		release_console_sem();
 		vcs_remove_sysfs(tty);
+		release_console_sem();
 		mutex_unlock(&tty_mutex);
 		/*
 		 * tty_mutex is released, but we still hold BKL, so there is
-- 
1.5.4.5