[PATCH] net: stmmac: Variable "val" in function sun8i_dwmac_set_syscon() could be uninitialized

[Yizhuo]

In function sun8i_dwmac_set_syscon(), local variable "val" could
be uninitialized if function regmap_read() returns -EINVAL.
However, it will be used directly in the if statement, which
is potentially unsafe.

Signed-off-by: Yizhuo <yzhai...@ucr.edu>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 39c2122a4f26..11d481c9e7ab 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -639,9 +639,14 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
        struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
        struct device_node *node = priv->device->of_node;
        int ret;
-       u32 reg, val;
+       u32 reg, val = 0;
+
+       ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
+       if (ret) {
+               dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n");
+               return ret;
+       }
 
-       regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
        reg = gmac->variant->default_syscon_value;
        if (reg != val)
                dev_warn(priv->device,
-- 
2.17.1