netdev - Re: [PATCH net] phy: Don't increment MDIO bus refcount unless it's a different owner

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Message-Id: <20161207.132959.1815674717089613175.davem@davemloft.net>
Date:   Wed, 07 Dec 2016 13:29:59 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     f.fainelli@...il.com
Cc:     netdev@...r.kernel.org, johan@...nel.org,
        rmk+kernel@....linux.org.uk, andrew@...n.ch
Subject: Re: [PATCH net] phy: Don't increment MDIO bus refcount unless it's
 a different owner

From: Florian Fainelli <f.fainelli@...il.com>
Date: Tue,  6 Dec 2016 20:54:43 -0800

> Commit 3e3aaf649416 ("phy: fix mdiobus module safety") fixed the way we
> dealt with MDIO bus module reference count, but sort of introduced a
> regression in that, if an Ethernet driver registers its own MDIO bus
> driver, as is common, we will end up with the Ethernet driver's
> module->refnct set to 1, thus preventing this driver from any removal.
> 
> Fix this by comparing the network device's device driver owner against
> the MDIO bus driver owner, and only if they are different, increment the
> MDIO bus module refcount.
> 
> Fixes: 3e3aaf649416 ("phy: fix mdiobus module safety")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>

Applied.