linux-kernel - [PATCH v2 1/6] phy: core: Fix that API devm_phy

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Message-Id: <20241024-phy_core_fix-v2-1-fc0c63dbfcf3@quicinc.com>
Date: Thu, 24 Oct 2024 22:39:26 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Vinod Koul <vkoul@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, Felipe Balbi <balbi@...com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Arnd Bergmann <arnd@...db.de>, 
 Lee Jones <lee@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Bjorn Helgaas <bhelgaas@...gle.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Christophe JAILLET <christophe.jaillet@...adoo.fr>, 
 Zijun Hu <zijun_hu@...oud.com>, stable@...r.kernel.org, 
 linux-phy@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH v2 1/6] phy: core: Fix that API devm_phy_put() fails to
 release the phy

From: Zijun Hu <quic_zijuhu@...cinc.com>

For devm_phy_put(), its comment says it needs to invoke phy_put() to
release the phy, but it does not invoke the function actually since
devres_destroy() will not call devm_phy_release() at all which will
call the function, 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();

  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

Fixed by using devres_release() instead of devres_destroy() within the API

Fixes: ff764963479a ("drivers: phy: add generic PHY framework")
Cc: stable@...r.kernel.org
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: "Krzysztof Wilczyński" <kw@...ux.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/phy/phy-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index f053b525ccff..f190d7126613 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -737,7 +737,7 @@ void devm_phy_put(struct device *dev, struct phy *phy)
 	if (!phy)
 		return;

-	r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy);
+	r = devres_release(dev, devm_phy_release, devm_phy_match, phy);
 	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
 }
 EXPORT_SYMBOL_GPL(devm_phy_put);

-- 
2.34.1