Messages in this thread Patch in this message | | | Date | Sat, 21 Sep 2013 03:43:44 -0400 | From | Alexey Pelykh <> | Subject | [PATCH] OMAP/serial: Fix division by zero exception on 3M+ baud rates |
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From: Alexey Pelykh <alexey.pelykh@gmail.com>
Fixes issue with division-by-zero exception, that occurred when a baud rate higher than 3Mbaud was requested.
Signed-off-by: Alexey Pelykh <alexey.pelykh@gmail.com> Cc: Tony Lindgren <tony@atomide.com> Cc: Felipe Balbi <balbi@ti.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: linux-serial@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-omap@vger.kernel.org Cc: linux-kernel@vger.kernel.org
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diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 816d1a2..808a880 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -240,8 +240,8 @@ serial_omap_baud_is_mode16(struct uart_port *port, unsigned int baud) { unsigned int n13 = port->uartclk / (13 * baud); unsigned int n16 = port->uartclk / (16 * baud); - int baudAbsDiff13 = baud - (port->uartclk / (13 * n13)); - int baudAbsDiff16 = baud - (port->uartclk / (16 * n16)); + int baudAbsDiff13 = n13 ? (baud - (port->uartclk / (13 * n13))) : INT_MAX; + int baudAbsDiff16 = n16 ? (baud - (port->uartclk / (16 * n16))) : INT_MAX; if(baudAbsDiff13 < 0) baudAbsDiff13 = -baudAbsDiff13; if(baudAbsDiff16 < 0)
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