net: stmicro: fix a missing check of clk_prepare

[ Upstream commit f86a3b83833e7cfe558ca4d70b64ebc48903efec ]

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

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sunxi.c
index d07520f..62ccbd4 100644 (file)
--- 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;