# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Node ID ba5495a418d7a48d61a84cd18348fb2c853477ff
# Parent  8e55c5c1147589b7a6a1875384d4317aec7ccf84
xenconsole fix. reference of tty->count in xencons_close() is racy.
It must be protected by tty_sem semaphore like con_close() in
drivers/char/vt.c
PATCHNAME: add_tty_sem

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r 8e55c5c11475 -r ba5495a418d7 linux-2.6-xen-sparse/drivers/xen/console/console.c
--- a/linux-2.6-xen-sparse/drivers/xen/console/console.c	Wed Jul 05 18:48:41 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/console/console.c	Fri Jul 07 17:34:08 2006 +0900
@@ -536,6 +536,7 @@ static void xencons_close(struct tty_str
 	if (DUMMY_TTY(tty))
 		return;
 
+	down(&tty_sem);
 	if (tty->count == 1) {
 		tty->closing = 1;
 		tty_wait_until_sent(tty, 0);
@@ -548,6 +549,7 @@ static void xencons_close(struct tty_str
 		xencons_tty = NULL;
 		spin_unlock_irqrestore(&xencons_lock, flags);
 	}
+	up(&tty_sem);
 }
 
 static struct tty_operations xencons_ops = {