[PATCH 3.10 032/268] can: ti_hecc: add missing prepare and unprepare of the clock

[Willy Tarreau]

From: Yegor Yefremov <yegorsli...@googlemail.com>

commit befa60113ce7ea270cb51eada28443ca2756f480 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().

Also add error checking for clk_prepare_enable().

Signed-off-by: Yegor Yefremov <yegorsli...@googlemail.com>
Signed-off-by: Marc Kleine-Budde <m...@pengutronix.de>
Signed-off-by: Willy Tarreau <w...@1wt.eu>
---
 drivers/net/can/ti_hecc.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index f21fc37..2c19b4f 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -962,7 +962,12 @@ static int ti_hecc_probe(struct platform_device *pdev)
        netif_napi_add(ndev, &priv->napi, ti_hecc_rx_poll,
                HECC_DEF_NAPI_WEIGHT);
 
-       clk_enable(priv->clk);
+       err = clk_prepare_enable(priv->clk);
+       if (err) {
+               dev_err(&pdev->dev, "clk_prepare_enable() failed\n");
+               goto probe_exit_clk;
+       }
+
        err = register_candev(ndev);
        if (err) {
                dev_err(&pdev->dev, "register_candev() failed\n");
@@ -995,7 +1000,7 @@ static int ti_hecc_remove(struct platform_device *pdev)
        struct ti_hecc_priv *priv = netdev_priv(ndev);
 
        unregister_candev(ndev);
-       clk_disable(priv->clk);
+       clk_disable_unprepare(priv->clk);
        clk_put(priv->clk);
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        iounmap(priv->base);
@@ -1021,7 +1026,7 @@ static int ti_hecc_suspend(struct platform_device *pdev, 
pm_message_t state)
        hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
        priv->can.state = CAN_STATE_SLEEPING;
 
-       clk_disable(priv->clk);
+       clk_disable_unprepare(priv->clk);
 
        return 0;
 }
@@ -1030,8 +1035,11 @@ static int ti_hecc_resume(struct platform_device *pdev)
 {
        struct net_device *dev = platform_get_drvdata(pdev);
        struct ti_hecc_priv *priv = netdev_priv(dev);
+       int err;
 
-       clk_enable(priv->clk);
+       err = clk_prepare_enable(priv->clk);
+       if (err)
+               return err;
 
        hecc_clear_bit(priv, HECC_CANMC, HECC_CANMC_PDR);
        priv->can.state = CAN_STATE_ERROR_ACTIVE;
-- 
2.8.0.rc2.1.gbe9624a