linux-kernel - [PATCH 04/10] tty: tty_buffer: warn if losing flags in __tty_insert_flip_string

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Message-ID: <20230816105530.3335-5-jirislaby@kernel.org>
Date:   Wed, 16 Aug 2023 12:55:24 +0200
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
Subject: [PATCH 04/10] 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) <jirislaby@...nel.org>
---
 drivers/tty/tty_buffer.c | 3 +++
 1 file changed, 3 insertions(+)

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;
-- 
2.41.0