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Subject[PATCH v2] net: ethernet: arc: fix error handling in emac_rockchip_probe
Date
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>
---

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
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