linux-kernel - [PATCH AUTOSEL for 4.14 067/100] net: ethernet: arc: fix error handling in emac_rockchip

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Date:   Sun, 28 Jan 2018 22:26:42 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Branislav Radocaj <branislav@...ocaj.org>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 067/100] net: ethernet: arc: fix error
 handling in emac_rockchip_probe

From: Branislav Radocaj <branislav@...ocaj.org>

[ 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@...ocaj.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/net/ethernet/arc/emac_rockchip.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/arc/emac_rockchip.c b/drivers/net/ethernet/arc/emac_rockchip.c
index e278e3d96ee0..c6163874e4e7 100644
--- 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);
-- 
2.11.0