tty: xuartps: Print warning in clock notifier

Print a warning if the clock notifier rejects a clock frequency change
to facilitate debugging (see:
http://thread.gmane.org/gmane.linux.ports.arm.kernel/304329/focus=304379)

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 787a120..8143910 100644 (file)
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -429,8 +429,10 @@ static int xuartps_clk_notifier_cb(struct notifier_block *nb,
                 * frequency.
                 */
                if (!xuartps_calc_baud_divs(ndata->new_rate, xuartps->baud,
-                                       &bdiv, &cd, &div8))
+                                       &bdiv, &cd, &div8)) {
+                       dev_warn(port->dev, "clock rate change rejected\n");
                        return NOTIFY_BAD;
+               }
 
                spin_lock_irqsave(&xuartps->port->lock, flags);