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net: ethernet: arc: fix error handling in emac_rockchip_probe

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

Changes since v2 [1]:
* Merged with latest code changes

Changes since v1:
Update made thanks to David's review, much appreciated David.
* Improved inconsistent failure handling of clock rate setting
* For completeness of usecase, added arc_emac_probe error handling

Signed-off-by: Branislav Radocaj <branislav@radocaj.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Branislav Radocaj 2017-12-12 00:13:38 +01:00 committed by David S. Miller
parent aceef61ee5
commit 2a9ee696c7
1 changed files with 7 additions and 3 deletions
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10
drivers/net/ethernet/arc/emac_rockchip.c
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@ -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");
@ -230,12 +232,14 @@ static int emac_rockchip_probe(struct platform_device *pdev)
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:
clk_disable_unprepare(priv->macclk);
if (priv->soc_data->need_div_macclk)
clk_disable_unprepare(priv->macclk);
out_regulator_disable:
if (priv->regulator)
regulator_disable(priv->regulator);