* [PATCH net] net: mdiobus: fix unbalanced node reference count
@ 2022-11-24 15:01 Yang Yingliang
2022-11-25 23:32 ` Andrew Lunn
2022-11-29 2:20 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Yang Yingliang @ 2022-11-24 15:01 UTC (permalink / raw)
To: netdev
Cc: andrew, hkallweit1, linux, davem, edumazet, kuba, pabeni,
ioana.ciornei, calvin.johnson, grant.likely
I got the following report while doing device(mscc-miim) load test
with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:
OF: ERROR: memory leak, expected refcount 1 instead of 2,
of_node_get()/of_node_put() unbalanced - destroy cset entry:
attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0
If the 'fwnode' is not an acpi node, the refcount is get in
fwnode_mdiobus_phy_device_register(), but it has never been
put when the device is freed in the normal path. So call
fwnode_handle_put() in phy_device_release() to avoid leak.
If it's an acpi node, it has never been get, but it's put
in the error path, so call fwnode_handle_get() before
phy_device_register() to keep get/put operation balanced.
Fixes: bc1bee3b87ee ("net: mdiobus: Introduce fwnode_mdiobus_register_phy()")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
drivers/net/mdio/fwnode_mdio.c | 2 +-
drivers/net/phy/phy_device.c | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index 689e728345ce..eb344f6d4a7b 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -146,11 +146,11 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
phy->irq = bus->irq[addr];
/* Associate the fwnode with the device structure so it
* can be looked up later.
*/
- phy->mdio.dev.fwnode = child;
+ phy->mdio.dev.fwnode = fwnode_handle_get(child);
/* All data is now stored in the phy struct, so register it */
rc = phy_device_register(phy);
if (rc) {
fwnode_handle_put(phy->mdio.dev.fwnode);
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index a72adabfd2a7..8cff61dbc4b5 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -215,10 +215,11 @@ static void phy_mdio_device_free(struct mdio_device *mdiodev)
phy_device_free(phydev);
}
static void phy_device_release(struct device *dev)
{
+ fwnode_handle_put(dev->fwnode);
kfree(to_phy_device(dev));
}
static void phy_mdio_device_remove(struct mdio_device *mdiodev)
{
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: mdiobus: fix unbalanced node reference count
2022-11-24 15:01 [PATCH net] net: mdiobus: fix unbalanced node reference count Yang Yingliang
@ 2022-11-25 23:32 ` Andrew Lunn
2022-11-29 2:20 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Andrew Lunn @ 2022-11-25 23:32 UTC (permalink / raw)
To: Yang Yingliang
Cc: netdev, hkallweit1, linux, davem, edumazet, kuba, pabeni,
ioana.ciornei, calvin.johnson, grant.likely
On Thu, Nov 24, 2022 at 11:01:30PM +0800, Yang Yingliang wrote:
> I got the following report while doing device(mscc-miim) load test
> with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:
>
> OF: ERROR: memory leak, expected refcount 1 instead of 2,
> of_node_get()/of_node_put() unbalanced - destroy cset entry:
> attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0
>
> If the 'fwnode' is not an acpi node, the refcount is get in
> fwnode_mdiobus_phy_device_register(), but it has never been
> put when the device is freed in the normal path. So call
> fwnode_handle_put() in phy_device_release() to avoid leak.
>
> If it's an acpi node, it has never been get, but it's put
> in the error path, so call fwnode_handle_get() before
> phy_device_register() to keep get/put operation balanced.
>
> Fixes: bc1bee3b87ee ("net: mdiobus: Introduce fwnode_mdiobus_register_phy()")
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Andrew
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: mdiobus: fix unbalanced node reference count
2022-11-24 15:01 [PATCH net] net: mdiobus: fix unbalanced node reference count Yang Yingliang
2022-11-25 23:32 ` Andrew Lunn
@ 2022-11-29 2:20 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2022-11-29 2:20 UTC (permalink / raw)
To: Yang Yingliang
Cc: netdev, andrew, hkallweit1, linux, davem, edumazet, kuba, pabeni,
ioana.ciornei, calvin.johnson, grant.likely
Hello:
This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:
On Thu, 24 Nov 2022 23:01:30 +0800 you wrote:
> I got the following report while doing device(mscc-miim) load test
> with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:
>
> OF: ERROR: memory leak, expected refcount 1 instead of 2,
> of_node_get()/of_node_put() unbalanced - destroy cset entry:
> attach overlay node /spi/soc@0/mdio@7107009c/ethernet-phy@0
>
> [...]
Here is the summary with links:
- [net] net: mdiobus: fix unbalanced node reference count
https://git.kernel.org/netdev/net/c/cdde1560118f
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
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2022-11-24 15:01 [PATCH net] net: mdiobus: fix unbalanced node reference count Yang Yingliang
2022-11-25 23:32 ` Andrew Lunn
2022-11-29 2:20 ` patchwork-bot+netdevbpf
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