[PATCH v2] net: ethernet: arc: fix error handling in emac_rockchip_probe

[Branislav Radocaj]

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

Signed-off-by: Branislav Radocaj <branis...@radocaj.org>
---

Changes since v2:
* Improved inconsistent failure handling of clock rate setting
* For completeness of usecase, added arc_emac_probe error handling
---
 drivers/net/ethernet/arc/emac_rockchip.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/arc/emac_rockchip.c 
b/drivers/net/ethernet/arc/emac_rockchip.c
index e278e3d96ee0..16f9bee992fe 100644
--- a/drivers/net/ethernet/arc/emac_rockchip.c
+++ b/drivers/net/ethernet/arc/emac_rockchip.c
@@ -199,9 +199,11 @@ static int emac_rockchip_probe(struct platform_device 
*pdev)
 
        /* RMII interface needs always a rate of 50MHz */
        err = clk_set_rate(priv->refclk, 50000000);
-       if (err)
+       if (err) {
                dev_err(dev,
                        "failed to change reference clock rate (%d)\n", err);
+               goto out_regulator_disable;
+       }
 
        if (priv->soc_data->need_div_macclk) {
                priv->macclk = devm_clk_get(dev, "macclk");
@@ -220,19 +222,24 @@ 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);
        if (err) {
                dev_err(dev, "failed to probe arc emac (%d)\n", err);
-               goto out_regulator_disable;
+               goto out_clk_disable_macclk;
        }
 
        return 0;
 
+out_clk_disable_macclk:
+       if (priv->soc_data->need_div_macclk)
+               clk_disable_unprepare(priv->macclk);
 out_regulator_disable:
        if (priv->regulator)
                regulator_disable(priv->regulator);
-- 
2.11.0