linux-kernel - [PATCH 2/3] serial: samsung: don't check config for every character

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Message-Id: <1398098436-31895-2-git-send-email-dianders@chromium.org>
Date:	Mon, 21 Apr 2014 09:40:35 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-samsung-soc@...r.kernel.org
Cc:	olof@...om.net, Doug Anderson <dianders@...omium.org>,
	jslaby@...e.cz, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] serial: samsung: don't check config for every character

The s3c24xx_serial_console_putchar() is _only_ ever used by
s3c24xx_serial_console_write() and is called in a loop (indirectly
through uart_console_write()).  There's no reason to call
s3c24xx_port_configured() for every iteration through the loop.  Move
it outside the loop.

Signed-off-by: Doug Anderson <dianders@...omium.org>
---
 drivers/tty/serial/samsung.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index a8e8b79..12442748 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1464,11 +1464,6 @@ static void
 s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
 {
 	unsigned int ufcon = rd_regl(port, S3C2410_UFCON);
-	unsigned int ucon = rd_regl(port, S3C2410_UCON);
-
-	/* not possible to xmit on unconfigured port */
-	if (!s3c24xx_port_configured(ucon))
-		return;
 
 	while (!s3c24xx_serial_console_txrdy(port, ufcon))
 		barrier();
@@ -1479,6 +1474,12 @@ static void
 s3c24xx_serial_console_write(struct console *co, const char *s,
 			     unsigned int count)
 {
+	unsigned int ucon = rd_regl(cons_uart, S3C2410_UCON);
+
+	/* not possible to xmit on unconfigured port */
+	if (!s3c24xx_port_configured(ucon))
+		return;
+
 	uart_console_write(cons_uart, s, count, s3c24xx_serial_console_putchar);
 }
 
-- 
1.9.1.423.g4596e3a

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