linux-kernel - [PATCH 22/33] serial: 8250: extract serial8250_set

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Message-ID: <20250611100319.186924-23-jirislaby@kernel.org>
Date: Wed, 11 Jun 2025 12:03:08 +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 22/33] serial: 8250: extract serial8250_set_ier()

serial8250_do_set_termios() consists of many registers and up flags
settings. Extract all these into separate functions. This time, setting
of IER.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@...nel.org>
---
 drivers/tty/serial/8250/8250_port.c | 31 ++++++++++++++++-------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 6bb7f004d607..2c045a4369fc 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2752,6 +2752,22 @@ static void serial8250_set_errors_and_ignores(struct uart_port *port, struct kte
 		port->ignore_status_mask |= UART_LSR_DR;
 }
 
+static void serial8250_set_ier(struct uart_port *port, struct ktermios *termios)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+
+	/* CTS flow control flag and modem status interrupts */
+	up->ier &= ~UART_IER_MSI;
+	if (!(up->bugs & UART_BUG_NOMSR) && UART_ENABLE_MS(&up->port, termios->c_cflag))
+		up->ier |= UART_IER_MSI;
+	if (up->capabilities & UART_CAP_UUE)
+		up->ier |= UART_IER_UUE;
+	if (up->capabilities & UART_CAP_RTOIE)
+		up->ier |= UART_IER_RTOIE;
+
+	serial_port_out(port, UART_IER, up->ier);
+}
+
 void
 serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		          const struct ktermios *old)
@@ -2780,20 +2796,7 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 	serial8250_set_afe(port, termios);
 	uart_update_timeout(port, termios->c_cflag, baud);
 	serial8250_set_errors_and_ignores(port, termios);
-
-	/*
-	 * CTS flow control flag and modem status interrupts
-	 */
-	up->ier &= ~UART_IER_MSI;
-	if (!(up->bugs & UART_BUG_NOMSR) &&
-			UART_ENABLE_MS(&up->port, termios->c_cflag))
-		up->ier |= UART_IER_MSI;
-	if (up->capabilities & UART_CAP_UUE)
-		up->ier |= UART_IER_UUE;
-	if (up->capabilities & UART_CAP_RTOIE)
-		up->ier |= UART_IER_RTOIE;
-
-	serial_port_out(port, UART_IER, up->ier);
+	serial8250_set_ier(port, termios);
 
 	if (up->capabilities & UART_CAP_EFR) {
 		unsigned char efr = 0;
-- 
2.49.0