From 4a8d99a409d3d194527674a896362992a171cd7b Mon Sep 17 00:00:00 2001 From: "Jiri Slaby (SUSE)" Date: Wed, 16 Aug 2023 12:55:24 +0200 Subject: tty: tty_buffer: warn if losing flags in __tty_insert_flip_string_flags() And add a WARN_ON_ONCE(need_flags) to make sure we are not losing flags in __tty_insert_flip_string_flags(). Signed-off-by: "Jiri Slaby (SUSE)" Link: https://lore.kernel.org/r/20230816105530.3335-5-jirislaby@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_buffer.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/tty/tty_buffer.c') diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 94a88dc05a54..c101b4ab737e 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -325,6 +325,9 @@ int __tty_insert_flip_string_flags(struct tty_port *port, const u8 *chars, flags += space; } else if (tb->flags) { memset(flag_buf_ptr(tb, tb->used), flags[0], space); + } else { + /* tb->flags should be available once requested */ + WARN_ON_ONCE(need_flags); } tb->used += space; -- cgit v1.2.3