linux-kernel - [PATCH RFC 2/6] tty: xemacps: Print warning in clock notifier

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Message-Id: <1393953449-28551-3-git-send-email-soren.brinkmann@xilinx.com>
Date:	Tue,  4 Mar 2014 09:17:25 -0800
From:	Soren Brinkmann <soren.brinkmann@...inx.com>
To:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>
Cc:	Michal Simek <michal.simek@...inx.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-serial@...r.kernel.org, Olof Johansson <olof@...om.net>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: [PATCH RFC 2/6] tty: xemacps: 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@...inx.com>
---
 drivers/tty/serial/xilinx_uartps.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index 8769b68534b1..4eee8031ae25 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -430,8 +430,10 @@ 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);
 
-- 
1.9.0.1.g4196000

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