[PATCH v2] net: stmmac: Fix signedness bug in stmmac_probe_config_dt()

YueHaibing
2020-08-18T15:15:34Z

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 <yuehaibing@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