From: David Dueck <davidcdueck@googlemail.com>
Date: Wed, 17 Sep 2014 12:26:48 +0000 (+0200)
Subject: can: at91_can: add missing prepare and unprepare of the clock
X-Git-Tag: v3.4.105~34
X-Git-Url: http://git.hungrycats.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8fcf8e698c8f33ff9f94ad067121e77a9ead6be5;p=linux

can: at91_can: add missing prepare and unprepare of the clock

commit e77980e50bc2850599d4d9c0192b67a9ffd6daac upstream.

In order to make the driver work with the common clock framework, this patch
converts the clk_enable()/clk_disable() to
clk_prepare_enable()/clk_disable_unprepare(). While there, add the missing
error handling.

Signed-off-by: David Dueck <davidcdueck@googlemail.com>
Signed-off-by: Anthony Harivel <anthony.harivel@emtrion.de>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Zefan Li <lizefan@huawei.com>
---

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 6ea905c2cf6d..12328068822e 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -1115,7 +1115,9 @@ static int at91_open(struct net_device *dev)
 	struct at91_priv *priv = netdev_priv(dev);
 	int err;
 
-	clk_enable(priv->clk);
+	err = clk_prepare_enable(priv->clk);
+	if (err)
+		return err;
 
 	/* check or determine and set bittime */
 	err = open_candev(dev);
@@ -1139,7 +1141,7 @@ static int at91_open(struct net_device *dev)
  out_close:
 	close_candev(dev);
  out:
-	clk_disable(priv->clk);
+	clk_disable_unprepare(priv->clk);
 
 	return err;
 }
@@ -1156,7 +1158,7 @@ static int at91_close(struct net_device *dev)
 	at91_chip_stop(dev, CAN_STATE_STOPPED);
 
 	free_irq(dev->irq, dev);
-	clk_disable(priv->clk);
+	clk_disable_unprepare(priv->clk);
 
 	close_candev(dev);