linux-kernel - [PATCH 13/16] serial: 8250

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20250814072456.182853-14-jirislaby@kernel.org>
Date: Thu, 14 Aug 2025 09:24:53 +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 13/16] serial: 8250_rsa: use guard()s

Having all the new guards, use them in the 8250_rsa code. This improves
readability, makes error handling easier, and marks locked portions of
code explicit.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/serial/8250/8250_rsa.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_rsa.c b/drivers/tty/serial/8250/8250_rsa.c
index d34093cc03ad..ff52ad02f6be 100644
--- a/drivers/tty/serial/8250/8250_rsa.c
+++ b/drivers/tty/serial/8250/8250_rsa.c
@@ -140,9 +140,8 @@ void rsa_enable(struct uart_8250_port *up)
 		return;
 
 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
-		uart_port_lock_irq(&up->port);
+		guard(uart_port_lock_irq)(&up->port);
 		__rsa_enable(up);
-		uart_port_unlock_irq(&up->port);
 	}
 	if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
 		serial_out(up, UART_RSA_FRR, 0);
@@ -165,7 +164,8 @@ void rsa_disable(struct uart_8250_port *up)
 	if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
 		return;
 
-	uart_port_lock_irq(&up->port);
+	guard(uart_port_lock_irq)(&up->port);
+
 	mode = serial_in(up, UART_RSA_MSR);
 	result = !(mode & UART_RSA_MSR_FIFO);
 
@@ -177,7 +177,6 @@ void rsa_disable(struct uart_8250_port *up)
 
 	if (result)
 		up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
-	uart_port_unlock_irq(&up->port);
 }
 EXPORT_SYMBOL_GPL_FOR_MODULES(rsa_disable, "8250_base");
 
-- 
2.50.1