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>
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2a768264ee
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@ -74,14 +74,14 @@ mtk8250_set_termios(struct uart_port *port, struct ktermios *termios,
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/* Set to next lower baudrate supported */
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if ((baud == 500000) || (baud == 576000))
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baud = 460800;
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quot = DIV_ROUND_CLOSEST(port->uartclk, 4 * baud);
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quot = DIV_ROUND_UP(port->uartclk, 4 * baud);
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} else {
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serial_port_out(port, UART_MTK_HIGHS, 0x3);
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/* Set to highest baudrate supported */
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if (baud >= 1152000)
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baud = 921600;
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quot = DIV_ROUND_CLOSEST(port->uartclk, 256 * baud);
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quot = DIV_ROUND_UP(port->uartclk, 256 * baud);
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}
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/*
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