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[1/3] tty: serial: Fix mediatek UART driver setting baudrate issue

Message ID 1413983529-21887-2-git-send-email-eddie.huang@mediatek.com (mailing list archive)
State New, archived
Headers show

Commit Message

Eddie Huang (黃智傑) Oct. 22, 2014, 1:12 p.m. UTC 
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@mediatek.com>
---
 drivers/tty/serial/8250/8250_mtk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

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);
 	}
 
 	/*