netdev - Re: [PATCH] mdio: mux: Correct mdio_mux

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Date:   Thu, 11 May 2017 13:20:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     jon.mason@...adcom.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com, andrew@...n.ch
Subject: Re: [PATCH] mdio: mux: Correct mdio_mux_init error path issues

From: Florian Fainelli <f.fainelli@...il.com>
Date: Thu, 11 May 2017 10:05:27 -0700

> On 05/10/2017 08:20 AM, Jon Mason wrote:
>> There is a potential unnecessary refcount decriment on error path of
>> put_device(&pb->mii_bus->dev), as it is possible to avoid the
>> of_mdio_find_bus() call if mux_bus is specified by the calling function.
>> 
>> The same put_device() is not called in the error path if the
>> devm_kzalloc of pb fails.  This caused the variable used in the
>> put_device() to be changed, as the pb pointer was obviously not set up.
>> 
>> There is an unnecessary of_node_get() on child_bus_node if the
>> of_mdiobus_register() is successful, as the
>> for_each_available_child_of_node() automatically increments this.
>> Thus the refcount on this node will always be +1 more than it should be.
>> 
>> There is no of_node_put() on child_bus_node if the of_mdiobus_register()
>> call fails.
>> 
>> Finally, it is lacking devm_kfree() of pb in the error path.  While this
>> might not be technically necessary, it was present in other parts of the
>> function.  So, I am adding it where necessary to make it uniform.
>> 
>> Signed-off-by: Jon Mason <jon.mason@...adcom.com>
>> Fixes: f20e6657a875 ("mdio: mux: Enhanced MDIO mux framework for integrated multiplexers")
>> Fixes: 0ca2997d1452 ("netdev/of/phy: Add MDIO bus multiplexer support.")
> 
> Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
> 
> Please include "net" in the subject for future submissions, thanks!

Applied.