The "plat->phy_interface" variable is an enum and in this context GCC
will treat it as an unsigned int so the error handling is never
triggered.

Fixes: b9f0b2f634c0 ("net: stmmac: platform: fix probe for ACPI devices")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
v2: use rc to do err handling
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c 
b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index f32317fa75c8..a6052e980ec5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -412,10 +412,11 @@ stmmac_probe_config_dt(struct platform_device *pdev, 
const char **mac)
                *mac = NULL;
        }
 
-       plat->phy_interface = device_get_phy_mode(&pdev->dev);
-       if (plat->phy_interface < 0)
-               return ERR_PTR(plat->phy_interface);
+       rc = device_get_phy_mode(&pdev->dev);
+       if (rc < 0)
+               return ERR_PTR(rc);
 
+       plat->phy_interface = rc;
        plat->interface = stmmac_of_get_mac_mode(np);
        if (plat->interface < 0)
                plat->interface = plat->phy_interface;
-- 
2.17.1


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