[PATCH 2/4] tty: omap-serial: prevent division by zero
From: Frans Klaver <hidden>
Date: 2014-08-19 12:16:51
Also in:
linux-arm-kernel, linux-omap, linux-serial, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
If the chosen baud rate is large enough (e.g. 3.5 megabaud), the calculated n values in calculate_baud_abs_diff may become 0. This causes a division by zero when calculating the difference between calculated and desired baud rates. To prevent this, cap n on 1. Signed-off-by: Frans Klaver <redacted> --- drivers/tty/serial/omap-serial.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index ae935ce..14a0167 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c@@ -246,8 +246,12 @@ static inline int calculate_baud_abs_diff(struct uart_port *port, unsigned int baud, unsigned int mode) { unsigned int n = port->uartclk / (mode * baud); - int abs_diff = baud - (port->uartclk / (mode * n)); + int abs_diff; + if (n == 0) + n = 1; + + abs_diff = baud - (uartclk / (mode * n)); if (abs_diff < 0) abs_diff = -abs_diff;
--
1.9.3
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