netdev - Re: [PATCH][NET] several cleanups and bugfixes for fec.c: fix the .remove code

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Message-ID: <20191.27018.478290.890636@ipc1.ka-ro>
Date:	Wed, 7 Dec 2011 14:26:34 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Shawn Guo <shawn.guo@...escale.com>
Cc:	<netdev@...r.kernel.org>, Shawn Guo <shawn.guo@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH][NET] several cleanups and bugfixes for fec.c: fix the
 .remove code

Hi,

Shawn Guo writes:
> On Tue, Dec 06, 2011 at 11:27:15AM +0100, Lothar Waßmann wrote:
> > The .remove code is broken in several ways.
> >  - mdiobus_unregister() is called twice for the same object in case of dual FEC
> >  - phy_disconnect() is being called when the PHY is already disconnected
> >  - the requested IRQ(s) are not freed
> >  - fec_stop() is being called with the inteface already stopped
> > 
> >  All of those lead to kernel crashes if the remove function is actually used.
> > 
> > Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
> > ---
> >  drivers/net/ethernet/freescale/fec.c |   30 +++++++++++++++++++++---------
> >  1 files changed, 21 insertions(+), 9 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/freescale/fec.c b/drivers/net/ethernet/freescale/fec.c
> > index ab0afb5..70ec7ec 100644
> > --- a/drivers/net/ethernet/freescale/fec.c
> > +++ b/drivers/net/ethernet/freescale/fec.c
> > @@ -235,6 +235,7 @@ struct fec_enet_private {
> >  
> >  	/* Phylib and MDIO interface */
> >  	struct	mii_bus *mii_bus;
> > +	int	mii_cnt;
> >  	struct	phy_device *phy_dev;
> >  	int	mii_timeout;
> >  	uint	phy_speed;
> > @@ -1040,8 +1041,12 @@ static int fec_enet_mii_init(struct platform_device *pdev)
> >  	 */
> >  	if ((id_entry->driver_data & FEC_QUIRK_ENET_MAC) && pdev->id > 0) {
> >  		/* fec1 uses fec0 mii_bus */
> > -		fep->mii_bus = fec0_mii_bus;
> > -		return 0;
> > +		if (fep->mii_cnt && fec0_mii_bus) {
> 
> This seems broken.  The second fec has its own fep and fep->mii_cnt is
> always 0 here.
> 
I already noticed that myself.


Lothar Waßmann
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