linux-kernel - [PATCH 1/3] tty: serial: Fix mediatek UART driver setting baudrate issue

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Date:	Wed, 22 Oct 2014 21:12:07 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jiri Slaby <jslaby@...e.cz>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Alan Cox <alan@...ux.intel.com>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<yh.chen@...iatek.com>, <hc.yen@...iatek.com>,
	<nathan.chung@...iatek.com>, <srv_heupstream@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: [PATCH 1/3] tty: serial: Fix mediatek UART driver setting baudrate issue

In mtk8250_set_termios function, calculating quot value can not be zero,
otherwise, using DIV_ROUND_CLOSEST(port->uartclk, quot * baud) will fail due to
divisor is zero.

Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
---
 drivers/tty/serial/8250/8250_mtk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c
index 8f37d57..6f93123 100644
--- a/drivers/tty/serial/8250/8250_mtk.c
+++ b/drivers/tty/serial/8250/8250_mtk.c
@@ -74,14 +74,14 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
 		/* Set to next lower baudrate supported */
 		if ((baud == 500000) || (baud == 576000))
 			baud = 460800;
-		quot = DIV_ROUND_CLOSEST(port->uartclk, 4 * baud);
+		quot = DIV_ROUND_UP(port->uartclk, 4 * baud);
 	} else {
 		serial_port_out(port, UART_MTK_HIGHS, 0x3);
 
 		/* Set to highest baudrate supported */
 		if (baud >= 1152000)
 			baud = 921600;
-		quot = DIV_ROUND_CLOSEST(port->uartclk, 256 * baud);
+		quot = DIV_ROUND_UP(port->uartclk, 256 * baud);
 	}
 
 	/*
-- 
1.8.1.1.dirty

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