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| author | Eddie Huang <eddie.huang@mediatek.com> | 2014-10-22 21:12:07 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-06 14:57:25 -0800 |
| commit | 2a768264eef098cc1355b02ca5023b6cfb183a1f (patch) | |
| tree | f28fb3d93fc08248120d520ef9432c27992f90bd | |
| parent | 7645c2f4677198df449228a4736d7f94e5c14156 (diff) | |
| download | linux-stable-2a768264eef098cc1355b02ca5023b6cfb183a1f.tar.gz linux-stable-2a768264eef098cc1355b02ca5023b6cfb183a1f.tar.bz2 linux-stable-2a768264eef098cc1355b02ca5023b6cfb183a1f.zip | |
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>
| -rw-r--r-- | drivers/tty/serial/8250/8250_mtk.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/tty/serial/8250/8250_mtk.c b/drivers/tty/serial/8250/8250_mtk.c index 8f37d57165ec..6f93123a428a 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); } /* |