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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@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eddie Huang 2014-10-22 21:12:07 +08:00 committed by Greg Kroah-Hartman
parent 7645c2f467
commit 2a768264ee
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/serial/8250/8250_mtk.c
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@ -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);
}
/*