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stmmac: dwmac-intel-plat: fix call balance of tx_clk handling routines

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If the clock dwmac->tx_clk was not enabled in intel_eth_plat_probe,
it should not be disabled in any path.

Conversely, if it was enabled in intel_eth_plat_probe, it must be disabled
in all error paths to ensure proper cleanup.

Found by Linux Verification Center (linuxtesting.org) with Klever.

Fixes: 9efc9b2b04 ("net: stmmac: Add dwmac-intel-plat for GBE driver")
Signed-off-by: Vitalii Mordan <mordan@ispras.ru>
Link: https://patch.msgid.link/20241108173334.2973603-1-mordan@ispras.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vitalii Mordan 2024-11-08 20:33:34 +03:00 committed by Jakub Kicinski
parent eb94b7bb10
commit 5b366eae71
1 changed files with 17 additions and 8 deletions
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25
drivers/net/ethernet/stmicro/stmmac/dwmac-intel-plat.c
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@ -108,7 +108,12 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
if (IS_ERR(dwmac->tx_clk))
return PTR_ERR(dwmac->tx_clk);
clk_prepare_enable(dwmac->tx_clk);
ret = clk_prepare_enable(dwmac->tx_clk);
if (ret) {
dev_err(&pdev->dev,
"Failed to enable tx_clk\n");
return ret;
}
/* Check and configure TX clock rate */
rate = clk_get_rate(dwmac->tx_clk);
@ -119,7 +124,7 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev,
"Failed to set tx_clk\n");
return ret;
goto err_tx_clk_disable;
}
}
}
@ -133,7 +138,7 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
if (ret) {
dev_err(&pdev->dev,
"Failed to set clk_ptp_ref\n");
return ret;
goto err_tx_clk_disable;
}
}
}
@ -149,12 +154,15 @@ static int intel_eth_plat_probe(struct platform_device *pdev)
}
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret) {
clk_disable_unprepare(dwmac->tx_clk);
return ret;
}
if (ret)
goto err_tx_clk_disable;
return 0;
err_tx_clk_disable:
if (dwmac->data->tx_clk_en)
clk_disable_unprepare(dwmac->tx_clk);
return ret;
}
static void intel_eth_plat_remove(struct platform_device *pdev)
@ -162,7 +170,8 @@ static void intel_eth_plat_remove(struct platform_device *pdev)
struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
stmmac_pltfr_remove(pdev);
clk_disable_unprepare(dwmac->tx_clk);
if (dwmac->data->tx_clk_en)
clk_disable_unprepare(dwmac->tx_clk);
}
static struct platform_driver intel_eth_plat_driver = {