linux-kernel - [PATCH 3.4 58/91] can: at91_can: add missing prepare and unprepare of the clock

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Message-Id: <1422418236-12852-115-git-send-email-lizf@kernel.org>
Date:	Wed, 28 Jan 2015 12:08:02 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	David Dueck <davidcdueck@...glemail.com>,
	Anthony Harivel <anthony.harivel@...rion.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 58/91] can: at91_can: add missing prepare and unprepare of the clock

From: David Dueck <davidcdueck@...glemail.com>

3.4.105-rc1 review patch.  If anyone has any objections, please let me know.

------------------


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@...glemail.com>
Signed-off-by: Anthony Harivel <anthony.harivel@...rion.de>
Acked-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Zefan Li <lizefan@...wei.com>
---
 drivers/net/can/at91_can.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index 6ea905c..12328068 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);
 
-- 
1.9.1

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