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

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>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index f07fa89b5fd5b294a5a234e949985080a0617a1d..05e1aa090adda6d98ed8e05dc5e14723556935bb 100644 (file)
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -1123,7 +1123,9 @@ 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);
@@ -1149,7 +1151,7 @@ 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;
 }
@@ -1166,7 +1168,7 @@ 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);