6.6-stable review patch. If anyone has any objections, please let me know.
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From: Vitalii Mordan mordan@ispras.ru
[ Upstream commit b032ae57d4fe2b2445e3bc190db6fcaa8c102f68 ]
If the clock pep->clk was not enabled in pxa168_eth_probe, it should not be disabled in any path.
Conversely, if it was enabled in pxa168_eth_probe, it must be disabled in all error paths to ensure proper cleanup.
Use the devm_clk_get_enabled helper function to ensure proper call balance for pep->clk.
Found by Linux Verification Center (linuxtesting.org) with Klever.
Fixes: a49f37eed22b ("net: add Fast Ethernet driver for PXA168.") Signed-off-by: Vitalii Mordan mordan@ispras.ru Link: https://patch.msgid.link/20241121200658.2203871-1-mordan@ispras.ru Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/marvell/pxa168_eth.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/marvell/pxa168_eth.c b/drivers/net/ethernet/marvell/pxa168_eth.c index d5691b6a2bc54..f2ca4376b48c6 100644 --- a/drivers/net/ethernet/marvell/pxa168_eth.c +++ b/drivers/net/ethernet/marvell/pxa168_eth.c @@ -1394,18 +1394,15 @@ static int pxa168_eth_probe(struct platform_device *pdev)
printk(KERN_NOTICE "PXA168 10/100 Ethernet Driver\n");
- clk = devm_clk_get(&pdev->dev, NULL); + clk = devm_clk_get_enabled(&pdev->dev, NULL); if (IS_ERR(clk)) { - dev_err(&pdev->dev, "Fast Ethernet failed to get clock\n"); + dev_err(&pdev->dev, "Fast Ethernet failed to get and enable clock\n"); return -ENODEV; } - clk_prepare_enable(clk);
dev = alloc_etherdev(sizeof(struct pxa168_eth_private)); - if (!dev) { - err = -ENOMEM; - goto err_clk; - } + if (!dev) + return -ENOMEM;
platform_set_drvdata(pdev, dev); pep = netdev_priv(dev); @@ -1523,8 +1520,6 @@ static int pxa168_eth_probe(struct platform_device *pdev) mdiobus_free(pep->smi_bus); err_netdev: free_netdev(dev); -err_clk: - clk_disable_unprepare(clk); return err; }
@@ -1542,7 +1537,6 @@ static int pxa168_eth_remove(struct platform_device *pdev) if (dev->phydev) phy_disconnect(dev->phydev);
- clk_disable_unprepare(pep->clk); mdiobus_unregister(pep->smi_bus); mdiobus_free(pep->smi_bus); unregister_netdev(dev);