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@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250611100319.186924-23-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 6bb7f004d6076044231580e409972a37258f2121..2c045a4369fcb8b228988a8039a2a2d68c935979 100644 (file)
--- 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;