[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 | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c 
b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
index 39c2122a4f26..50cfd6d83052 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
@@ -641,7 +641,12 @@ static int sun8i_dwmac_set_syscon(struct stmmac_priv *priv)
        int ret;
        u32 reg, val;
 
-       regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
+       ret = regmap_read(gmac->regmap, SYSCON_EMAC_REG, &val);
+       if (ret) {
+               dev_err(priv->device, "Fail to read SYSCON_EMAC_REG.\n");
+               return ret;
+       }
+
        reg = gmac->variant->default_syscon_value;
        if (reg != val)
                dev_warn(priv->device,
-- 
2.17.1