netdev - Re: [PATCH net] net: mdiobus: fix unbalanced node reference count

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Date:   Sat, 26 Nov 2022 00:32:12 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     netdev@...r.kernel.org, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, ioana.ciornei@....com,
        calvin.johnson@....nxp.com, grant.likely@....com
Subject: Re: [PATCH net] net: mdiobus: fix unbalanced node reference count

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@...dio@...7009c/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@...wei.com>

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew