From: Alan Cox Date: Mon, 4 Jan 2010 16:26:21 +0000 (+0000) Subject: serial: Fix crash if the minimum rate of the device is > 9600 baud X-Git-Tag: upstream/snapshot3+hdmi~15795^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=16ae2a877bf4179737921235e85ceffd7b79354f;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git 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: Alan Cox Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index fa4f170..7f28307 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -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; }