linux-kernel - [PATCH 50/70] mxser: rework and simplify mxser

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:   Fri, 18 Jun 2021 08:14:56 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 50/70] mxser: rework and simplify mxser_open

In mxser_open, tty->port is already set thanks to
tty_port_register_device in ->probe. So we can simply use container_of
to deduce the struct mxser_port's pointer. Thus avoiding divisions and
complex computations.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/tty/mxser.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 1e54e94a7ca6..ea5e61a5a173 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -856,15 +856,12 @@ static void mxser_shutdown_port(struct tty_port *port)
  */
 static int mxser_open(struct tty_struct *tty, struct file *filp)
 {
-	struct mxser_port *info;
-	int line = tty->index;
+	struct tty_port *tport = tty->port;
+	struct mxser_port *port = container_of(tport, struct mxser_port, port);
 
-	info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
-	if (!info->ioaddr)
-		return -ENODEV;
+	tty->driver_data = port;
 
-	tty->driver_data = info;
-	return tty_port_open(&info->port, tty, filp);
+	return tty_port_open(tport, tty, filp);
 }
 
 static void mxser_flush_buffer(struct tty_struct *tty)
-- 
2.32.0