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Subject[PATCH 3.13 124/163] can: at91_can: add missing prepare and unprepare of the clock
Date
3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

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

From: David Dueck <davidcdueck@googlemail.com>

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: Kamal Mostafa <kamal@canonical.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 cf0f63e..5e76a95 100644
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -1120,7 +1120,9 @@ 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);
@@ -1146,7 +1148,7 @@ 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;
}
@@ -1163,7 +1165,7 @@ 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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