[PATCH] net: stmicro: fix a missing check of clk_prepare

[Kangjie Lu]

clk_prepare() could fail, so let's check its status, and if it fails,
return its error code upstream.

Signed-off-by: Kangjie Lu <k...@umn.edu>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
index d07520fb969e..62ccbd47c1db 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
@@ -59,7 +59,9 @@ static int sun7i_gmac_init(struct platform_device *pdev, void 
*priv)
                gmac->clk_enabled = 1;
        } else {
                clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
-               clk_prepare(gmac->tx_clk);
+               ret = clk_prepare(gmac->tx_clk);
+               if (ret)
+                       return ret;
        }
 
        return 0;
-- 
2.17.2 (Apple Git-113)