From f418f2ec440ab8c014f37539ef0b19271afb1186 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 5 Jun 2014 16:33:24 +0200 Subject: [PATCH] vt: Don't ignore unbind errors in vt_unbind Otherwise the loop will never stop since we don't make any forward progress. Noticed while breaking this accidentally in a painful attempt to make vga_con unregistering work. With this patch we'll bail out on the first attempt, which at least leaves a useful enough system behind for debugging. Livelocks on console_lock just aren't fun. Cc: Greg Kroah-Hartman Cc: Jiri Slaby Reviewed-by: David Herrmann Acked-by: Greg Kroah-Hartman Signed-off-by: Daniel Vetter --- drivers/tty/vt/vt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 5077fe87324d..3c00dcb3b145 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3260,6 +3260,7 @@ static int vt_unbind(struct con_driver *con) { const struct consw *csw = NULL; int i, more = 1, first = -1, last = -1, deflt = 0; + int ret; if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || con_is_graphics(con->con, con->first, con->last)) @@ -3285,8 +3286,10 @@ static int vt_unbind(struct con_driver *con) if (first != -1) { console_lock(); - do_unbind_con_driver(csw, first, last, deflt); + ret = do_unbind_con_driver(csw, first, last, deflt); console_unlock(); + if (ret != 0) + return ret; } first = -1;