linux-kernel - [PATCH 08/14] tty: n_tty: move newline handling to a separate function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 16 Aug 2023 12:58:16 +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 08/14] tty: n_tty: move newline handling to a separate function

Currently, n_tty handles the newline in a label in
n_tty_receive_char_canon(). That is invoked from two more places. Split
this code to a separate function and avoid the label in this case.

This makes the code flow more understandable.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/n_tty.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index ae80d57c9f97..ab3e7c20fbef 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -1262,6 +1262,17 @@ static bool n_tty_receive_char_flow_ctrl(struct tty_struct *tty, unsigned char c
 	return true;
 }
 
+static void n_tty_receive_handle_newline(struct tty_struct *tty, u8 c)
+{
+	struct n_tty_data *ldata = tty->disc_data;
+
+	set_bit(MASK(ldata->read_head), ldata->read_flags);
+	put_tty_queue(c, ldata);
+	smp_store_release(&ldata->canon_head, ldata->read_head);
+	kill_fasync(&tty->fasync, SIGIO, POLL_IN);
+	wake_up_interruptible_poll(&tty->read_wait, EPOLLIN | EPOLLRDNORM);
+}
+
 static bool n_tty_receive_char_canon(struct tty_struct *tty, u8 c)
 {
 	struct n_tty_data *ldata = tty->disc_data;
@@ -1308,12 +1319,16 @@ static bool n_tty_receive_char_canon(struct tty_struct *tty, u8 c)
 			echo_char_raw('\n', ldata);
 			commit_echoes(tty);
 		}
-		goto handle_newline;
+		n_tty_receive_handle_newline(tty, c);
+
+		return true;
 	}
 
 	if (c == EOF_CHAR(tty)) {
 		c = __DISABLED_CHAR;
-		goto handle_newline;
+		n_tty_receive_handle_newline(tty, c);
+
+		return true;
 	}
 
 	if ((c == EOL_CHAR(tty)) ||
@@ -1335,12 +1350,8 @@ static bool n_tty_receive_char_canon(struct tty_struct *tty, u8 c)
 		if (c == (unsigned char) '\377' && I_PARMRK(tty))
 			put_tty_queue(c, ldata);
 
-handle_newline:
-		set_bit(MASK(ldata->read_head), ldata->read_flags);
-		put_tty_queue(c, ldata);
-		smp_store_release(&ldata->canon_head, ldata->read_head);
-		kill_fasync(&tty->fasync, SIGIO, POLL_IN);
-		wake_up_interruptible_poll(&tty->read_wait, EPOLLIN | EPOLLRDNORM);
+		n_tty_receive_handle_newline(tty, c);
+
 		return true;
 	}
 
-- 
2.41.0