linux-kernel - [PATCH 3/7] serial: 8250: Refactor LCR computation

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Date:	Thu, 22 Jan 2015 12:24:27 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 3/7] serial: 8250: Refactor LCR computation

Refactor the computation of the LCR register value from termios c_cflag
into a new local function, serial8250_compute_lcr().

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/serial/8250/8250_core.c | 32 +++++++++++++++++++++-----------
 1 file changed, 21 insertions(+), 11 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index fa40982..77afa5f 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -2417,16 +2417,12 @@ static unsigned int serial8250_get_divisor(struct uart_8250_port *up, unsigned i
 	return quot;
 }
 
-void
-serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
-		          struct ktermios *old)
+static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
+					    tcflag_t c_cflag)
 {
-	struct uart_8250_port *up = up_to_u8250p(port);
 	unsigned char cval;
-	unsigned long flags;
-	unsigned int baud, quot;
 
-	switch (termios->c_cflag & CSIZE) {
+	switch (c_cflag & CSIZE) {
 	case CS5:
 		cval = UART_LCR_WLEN5;
 		break;
@@ -2442,20 +2438,34 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 		break;
 	}
 
-	if (termios->c_cflag & CSTOPB)
+	if (c_cflag & CSTOPB)
 		cval |= UART_LCR_STOP;
-	if (termios->c_cflag & PARENB) {
+	if (c_cflag & PARENB) {
 		cval |= UART_LCR_PARITY;
 		if (up->bugs & UART_BUG_PARITY)
 			up->fifo_bug = true;
 	}
-	if (!(termios->c_cflag & PARODD))
+	if (!(c_cflag & PARODD))
 		cval |= UART_LCR_EPAR;
 #ifdef CMSPAR
-	if (termios->c_cflag & CMSPAR)
+	if (c_cflag & CMSPAR)
 		cval |= UART_LCR_SPAR;
 #endif
 
+	return cval;
+}
+
+void
+serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
+		          struct ktermios *old)
+{
+	struct uart_8250_port *up = up_to_u8250p(port);
+	unsigned char cval;
+	unsigned long flags;
+	unsigned int baud, quot;
+
+	cval = serial8250_compute_lcr(up, termios->c_cflag);
+
 	/*
 	 * Ask the core to calculate the divisor for us.
 	 */
-- 
2.2.2

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