[PATCH v2] net: lpc_eth: Check clk_prepare_enable() error

[Fabio Estevam]

From: Fabio Estevam <fabio.este...@nxp.com>

clk_prepare_enable() may fail, so we should better check its return
value and propagate it in the case of failure

While at it, replace __lpc_eth_clock_enable() with a plain
clk_prepare_enable/clk_disable_unprepare() call in order to
simplify the code.

Signed-off-by: Fabio Estevam <fabio.este...@nxp.com>
---
Changes since v1:
- Replace __lpc_eth_clock_enable() with a plain
clk_prepare_enable/clk_disable_unprepare() call (Vladimir)

 drivers/net/ethernet/nxp/lpc_eth.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/nxp/lpc_eth.c 
b/drivers/net/ethernet/nxp/lpc_eth.c
index 4d4ecba..cda87ba 100644
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -475,14 +475,6 @@ static void __lpc_get_mac(struct netdata_local *pldat, u8 
*mac)
        mac[5] = tmp >> 8;
 }
 
-static void __lpc_eth_clock_enable(struct netdata_local *pldat, bool enable)
-{
-       if (enable)
-               clk_prepare_enable(pldat->clk);
-       else
-               clk_disable_unprepare(pldat->clk);
-}
-
 static void __lpc_params_setup(struct netdata_local *pldat)
 {
        u32 tmp;
@@ -1056,7 +1048,7 @@ static int lpc_eth_close(struct net_device *ndev)
        writel(0, LPC_ENET_MAC2(pldat->net_base));
        spin_unlock_irqrestore(&pldat->lock, flags);
 
-       __lpc_eth_clock_enable(pldat, false);
+       clk_disable_unprepare(pldat->clk);
 
        return 0;
 }
@@ -1197,11 +1189,14 @@ static int lpc_eth_ioctl(struct net_device *ndev, 
struct ifreq *req, int cmd)
 static int lpc_eth_open(struct net_device *ndev)
 {
        struct netdata_local *pldat = netdev_priv(ndev);
+       int ret;
 
        if (netif_msg_ifup(pldat))
                dev_dbg(&pldat->pdev->dev, "enabling %s\n", ndev->name);
 
-       __lpc_eth_clock_enable(pldat, true);
+       ret = clk_prepare_enable(pldat->clk);
+       if (ret)
+               return ret;
 
        /* Suspended PHY makes LPC ethernet core block, so resume now */
        phy_resume(ndev->phydev);
@@ -1320,7 +1315,9 @@ static int lpc_eth_drv_probe(struct platform_device *pdev)
        }
 
        /* Enable network clock */
-       __lpc_eth_clock_enable(pldat, true);
+       ret = clk_prepare_enable(pldat->clk);
+       if (ret)
+               goto err_out_free_dev;
 
        /* Map IO space */
        pldat->net_base = ioremap(res->start, resource_size(res));
-- 
2.7.4