提交 16ae2a87 编写于 作者: A Alan Cox 提交者: Greg Kroah-Hartman

serial: Fix crash if the minimum rate of the device is > 9600 baud

In that situation if the old rate is invalid and the new rate is invalid
and the chip cannot do 9600 baud we report zero, which makes all the
drivers explode.

Instead force the rate based on min/max
Signed-off-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 4547be78
......@@ -385,13 +385,20 @@ uart_get_baud_rate(struct uart_port *port, struct ktermios *termios,
}
/*
* As a last resort, if the quotient is zero,
* default to 9600 bps
* As a last resort, if the range cannot be met then clip to
* the nearest chip supported rate.
*/
if (!hung_up)
tty_termios_encode_baud_rate(termios, 9600, 9600);
if (!hung_up) {
if (baud <= min)
tty_termios_encode_baud_rate(termios,
min + 1, min + 1);
else
tty_termios_encode_baud_rate(termios,
max - 1, max - 1);
}
}
/* Should never happen */
WARN_ON(1);
return 0;
}
......
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