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Zijun Huvinodkoul
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phy: core: Fix that API devm_phy_put() fails to release the phy
For devm_phy_put(), its comment says it needs to invoke phy_put() to release the phy, but it will not actually invoke the function since devres_destroy() does not call devm_phy_release(), and the missing phy_put() call will cause: - The phy fails to be released. - devm_phy_put() can not fully undo what API devm_phy_get() does. - Leak refcount of both the module and device for below typical usage: devm_phy_get(); // or its variant ... err = do_something(); if (err) goto err_out; ... err_out: devm_phy_put(); // leak refcount here The file(s) affected by this issue are shown below since they have such typical usage. drivers/pci/controller/cadence/pcie-cadence.c drivers/net/ethernet/ti/am65-cpsw-nuss.c Fix by using devres_release() instead of devres_destroy() within the API. Fixes: ff76496 ("drivers: phy: add generic PHY framework") Cc: stable@vger.kernel.org Cc: Lorenzo Pieralisi <lpieralisi@kernel.org> Cc: Krzysztof Wilczyński <kw@linux.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: David S. Miller <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Johan Hovold <johan+linaro@kernel.org> Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com> Link: https://lore.kernel.org/r/20241213-phy_core_fix-v6-1-40ae28f5015a@quicinc.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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drivers/phy/phy-core.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -737,7 +737,7 @@ void devm_phy_put(struct device *dev, struct phy *phy)
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if (!phy)
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return;
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r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
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r = devres_release(dev, devm_phy_release, devm_phy_match, phy);
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dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
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}
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EXPORT_SYMBOL_GPL(devm_phy_put);

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