net: ethernet: arc: fix error handling in emac_rockchip_probe

[ Upstream commit e46772a6946a7d1f3fbbc1415871851d6651f1d4 ]

If clk_set_rate() fails, we should disable clk before return.
Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Branislav Radocaj <branislav@radocaj.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/arc/emac_rockchip.c b/drivers/net/ethernet/arc/emac_rockchip.c
index e278e3d..c616387 100644 (file)
--- a/drivers/net/ethernet/arc/emac_rockchip.c
+++ b/drivers/net/ethernet/arc/emac_rockchip.c
@@ -220,9 +220,11 @@ static int emac_rockchip_probe(struct platform_device *pdev)
 
                /* RMII TX/RX needs always a rate of 25MHz */
                err = clk_set_rate(priv->macclk, 25000000);
-               if (err)
+               if (err) {
                        dev_err(dev,
                                "failed to change mac clock rate (%d)\n", err);
+                       goto out_clk_disable_macclk;
+               }
        }
 
        err = arc_emac_probe(ndev, interface);
@@ -232,7 +234,8 @@ static int emac_rockchip_probe(struct platform_device *pdev)
        }
 
        return 0;
-
+out_clk_disable_macclk:
+       clk_disable_unprepare(priv->macclk);
 out_regulator_disable:
        if (priv->regulator)
                regulator_disable(priv->regulator);