linux-kernel - [PATCH 09/18] serial: max310x: simplify probe() and remove() error handling

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]

Message-Id: <20240117223856.2303475-10-hugo@hugovil.com>
Date: Wed, 17 Jan 2024 17:38:47 -0500
From: Hugo Villeneuve <hugo@...ovil.com>
To: gregkh@...uxfoundation.org,
	jirislaby@...nel.org,
	cosmin.tanislav@...log.com,
	andy.shevchenko@...il.com,
	shc_work@...l.ru
Cc: linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	hugo@...ovil.com,
	Hugo Villeneuve <hvilleneuve@...onoff.com>
Subject: [PATCH 09/18] serial: max310x: simplify probe() and remove() error handling

From: Hugo Villeneuve <hvilleneuve@...onoff.com>

Simplify error handling and only call uart_remove_one_port() if line bit
is set, instead of having to manually set s->p[i].port.dev to NULL.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
 drivers/tty/serial/max310x.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index d6219077d23c..9ef146f09d5b 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -1395,10 +1395,9 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 
 		/* Register port */
 		ret = uart_add_one_port(&max310x_uart, &s->p[i].port);
-		if (ret) {
-			s->p[i].port.dev = NULL;
+		if (ret)
 			goto out_uart;
-		}
+
 		set_bit(line, max310x_lines);
 
 		/* Go to suspend mode */
@@ -1433,10 +1432,8 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 
 out_uart:
 	for (i = 0; i < devtype->nr; i++) {
-		if (s->p[i].port.dev) {
+		if (test_and_clear_bit(s->p[i].port.line, max310x_lines))
 			uart_remove_one_port(&max310x_uart, &s->p[i].port);
-			clear_bit(s->p[i].port.line, max310x_lines);
-		}
 	}
 
 out_clk:
@@ -1454,8 +1451,10 @@ static void max310x_remove(struct device *dev)
 		cancel_work_sync(&s->p[i].tx_work);
 		cancel_work_sync(&s->p[i].md_work);
 		cancel_work_sync(&s->p[i].rs_work);
-		uart_remove_one_port(&max310x_uart, &s->p[i].port);
-		clear_bit(s->p[i].port.line, max310x_lines);
+
+		if (test_and_clear_bit(s->p[i].port.line, max310x_lines))
+			uart_remove_one_port(&max310x_uart, &s->p[i].port);
+
 		s->devtype->power(&s->p[i].port, 0);
 	}
 
-- 
2.39.2