netdev - [PATCH net] net: stmmac: dwmac-meson8b: Fix signedness bug in probe

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Date:   Wed, 25 Sep 2019 13:58:22 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Kevin Hilman <khilman@...libre.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        kernel-janitors@...r.kernel.org
Subject: [PATCH net] net: stmmac: dwmac-meson8b: Fix signedness bug in probe

The "dwmac->phy_mode" is an enum and in this context GCC treats it as
an unsigned int so the error handling is never triggered.

Fixes: 566e82516253 ("net: stmmac: add a glue driver for the Amlogic Meson 8b / GXBB DWMAC")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
index 9cda29e4b89d..306da8f6b7d5 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
@@ -339,7 +339,7 @@ static int meson8b_dwmac_probe(struct platform_device *pdev)
 
 	dwmac->dev = &pdev->dev;
 	dwmac->phy_mode = of_get_phy_mode(pdev->dev.of_node);
-	if (dwmac->phy_mode < 0) {
+	if ((int)dwmac->phy_mode < 0) {
 		dev_err(&pdev->dev, "missing phy-mode property\n");
 		ret = -EINVAL;
 		goto err_remove_config_dt;
-- 
2.20.1