linux-kernel - [PATCH 4.14 123/159] net: ethernet: arc: fix error handling in emac_rockchip

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Date:   Fri, 23 Feb 2018 19:27:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Branislav Radocaj <branislav@...ocaj.org>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 123/159] net: ethernet: arc: fix error handling in emac_rockchip_probe

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/arc/emac_rockchip.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- 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 pl
 
 		/* 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 pl
 	}
 
 	return 0;
-
+out_clk_disable_macclk:
+	clk_disable_unprepare(priv->macclk);
 out_regulator_disable:
 	if (priv->regulator)
 		regulator_disable(priv->regulator);