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vt_kdsetmode: extend console locking

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commit 2287a51ba8 upstream.

As per the long-suffering comment.

Reported-by: Minh Yuan <yuanmingbuaa@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Torvalds
2021-08-30 08:55:18 -07:00
committed by Chris
parent 17fdd0c9f8
commit c0e792b3a1
1 changed files with 7 additions and 4 deletions
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11
drivers/tty/vt/vt_ioctl.c
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@@ -487,16 +487,19 @@ int vt_ioctl(struct tty_struct *tty,
ret = -EINVAL;
goto out;
}
/* FIXME: this needs the console lock extending */
if (vc->vc_mode == (unsigned char) arg)
console_lock();
if (vc->vc_mode == (unsigned char) arg) {
console_unlock();
break;
}
vc->vc_mode = (unsigned char) arg;
if (console != fg_console)
if (console != fg_console) {
console_unlock();
break;
}
/*
* explicitly blank/unblank the screen if switching modes
*/
console_lock();
if (arg == KD_TEXT)
do_unblank_screen(1);
else