TI DaVinci EMAC: Handle emac module clock correctly.

In the driver probe function the emac module clock needs to
be enabled before calling register_netdev(). As soon as the
device is registered the driver get_stats function can be invoked
by the core - the module clock must be switched on to be able to
read from stats registers. Also explicitly call matching clk_disable
for failure conditions in probe function.

Signed-off-by: Sriramakrishnan <srk@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/davinci_emac.c b/drivers/net/davinci_emac.c
index 34e0310..33c4fe2 100644 (file)
--- a/drivers/net/davinci_emac.c
+++ b/drivers/net/davinci_emac.c
@@ -2711,6 +2711,8 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
        SET_ETHTOOL_OPS(ndev, &ethtool_ops);
        netif_napi_add(ndev, &priv->napi, emac_poll, EMAC_POLL_WEIGHT);
 
+       clk_enable(emac_clk);
+
        /* register the network device */
        SET_NETDEV_DEV(ndev, &pdev->dev);
        rc = register_netdev(ndev);
@@ -2720,7 +2722,6 @@ static int __devinit davinci_emac_probe(struct platform_device *pdev)
                goto netdev_reg_err;
        }
 
-       clk_enable(emac_clk);
 
        /* MII/Phy intialisation, mdio bus registration */
        emac_mii = mdiobus_alloc();
@@ -2760,6 +2761,7 @@ mdiobus_quit:
 
 netdev_reg_err:
 mdio_alloc_err:
+       clk_disable(emac_clk);
 no_irq_res:
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        release_mem_region(res->start, res->end - res->start + 1);