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Date:	Fri, 3 Oct 2008 11:49:56 +0200
From:	Laurent Pinchart <laurentp@...-semaphore.com>
To:	Lennert Buytenhek <buytenh@...tstofly.org>
Cc:	Pantelis Antoniou <pantelis.antoniou@...il.com>,
	Vitaly Bordug <vbordug@...mvista.com>,
	Michael Chan <mchan@...adcom.com>,
	Olof Johansson <olof@...om.net>,
	Kumar Gala <galak@...nel.crashing.org>,
	Eugene Konev <ejka@...i.kspu.ru>,
	Manuel Lauss <manuel.lauss@...il.com>,
	Kim Phillips <kim.phillips@...escale.com>,
	Haavard Skinnemoen <hskinnemoen@...el.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Li Yang <leoli@...escale.com>,
	Scott Wood <scottwood@...escale.com>,
	Bryan Wu <cooloney@...nel.org>, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org, Andy Fleming <afleming@...escale.com>
Subject: Re: [PATCH,CFT] dynamic struct mii_bus allocation

On Friday 03 October 2008, Lennert Buytenhek wrote:
> On Fri, Oct 03, 2008 at 11:36:01AM +0200, Laurent Pinchart wrote:
> 
> > Hi Lennert,
> 
> Hi Laurent,
> 
> 
> > > You're listed as maintainer of one of the network drivers in the tree
> > > that use phylib.  Available at the URL below is a change to the phylib
> > > API (dynamic allocation of struct mii_bus, which is needed for hooking
> > > up mdio buses into the device tree) that needs corresponding mdio bus
> > > driver changes.  I've patched all mdio bus drivers I could find, and
> > > tried not to break anything, but it's possible I might have
> > > inadvertently broken something, so I'd like you to test these changes
> > > and let me know if they work for you or not:
> > > 
> > > 	git://git.marvell.com/phylib.git master
> > > 
> > > As a side-effect of the last patch, you should end up with a list of
> > > mdio buses in your system in /sys/class/mdio_bus.
> > > 
> > > 
> > > thanks,
> > > Lennert
> > > 
> > > 
> > > The following changes since commit e69c4e0f1210450841e40716894ba6a877b31d52:
> > >   Vlad Yasevich (1):
> > >         sctp: correctly save sctp_adaptation from parameter.
> > > 
> > > are available in the git repository at:
> > > 
> > >   git://git.marvell.com/phylib.git master
> > > 
> > > Lennert Buytenhek (5):
> > >       phylib: phy_mii_ioctl() fixes
> > >       phylib: add mdiobus_{read,write}
> > >       phylib: rename mii_bus::dev to mii_bus::parent
> > >       phylib: move to dynamic allocation of struct mii_bus
> > >       phylib: give mdio buses a device tree presence
> > > 
> > >  arch/powerpc/platforms/82xx/ep8248e.c     |    2 +-
> > >  arch/powerpc/platforms/pasemi/gpio_mdio.c |    6 +-
> > >  drivers/net/au1000_eth.c                  |   43 ++++++---
> > >  drivers/net/au1000_eth.h                  |    2 +-
> > >  drivers/net/bfin_mac.c                    |   31 ++++---
> > >  drivers/net/bfin_mac.h                    |    2 +-
> > >  drivers/net/cpmac.c                       |   51 ++++++----
> > >  drivers/net/fec_mpc52xx_phy.c             |    8 +-
> > >  drivers/net/fs_enet/mii-bitbang.c         |    9 +-
> > >  drivers/net/fs_enet/mii-fec.c             |    8 +-
> > >  drivers/net/gianfar_mii.c                 |    9 +-
> > >  drivers/net/macb.c                        |   49 ++++++----
> > >  drivers/net/macb.h                        |    2 +-
> > >  drivers/net/mv643xx_eth.c                 |   32 ++++---
> > 
> > Just a side note, the patch "phylib: rename mii_bus::dev to
> > mii_bus::parent" seems to do a lot more than just renaming mii_bus::dev
> > to mii_bus::parent in drivers/net/mv643xx_eth.c. You might have
> > inadvertently committed unrelated changes.
> 
> What commit ID are you looking at?  I only see this:
> 
> 	commit def8867a8d2a9f474262dd46179770845a420d51
> 	Author: Lennert Buytenhek <buytenh@...tstofly.org>
> 	Date:   Tue Sep 23 02:35:17 2008 +0200
> 
> 	    phylib: rename mii_bus::dev to mii_bus::parent
> 	    
> 	    In preparation of giving mii_bus objects a device tree presence of
> 	    their own, rename struct mii_bus's ->dev argument to ->parent, since
> 	    having a 'struct device *dev' that points to our parent device
> 	    conflicts with introducing a 'struct device dev' representing our own
> 	    device.
> 	    
> 	    Signed-off-by: Lennert Buytenhek <buytenh@...vell.com>
> 	    Acked-by: Andy Fleming <afleming@...escale.com>
> 
> 	[...]
> 
> 	diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
> 	index 372811a..6340081 100644
> 	--- a/drivers/net/mv643xx_eth.c
> 	+++ b/drivers/net/mv643xx_eth.c
> 	@@ -2368,7 +2368,7 @@ static int mv643xx_eth_shared_probe(struct platform_device
> 			msp->smi_bus.read = smi_bus_read;
> 			msp->smi_bus.write = smi_bus_write,
> 			snprintf(msp->smi_bus.id, MII_BUS_ID_SIZE, "%d", pdev->id);
> 	-               msp->smi_bus.dev = &pdev->dev;
> 	+               msp->smi_bus.parent = &pdev->dev;
> 			msp->smi_bus.phy_mask = 0xffffffff;
> 			if (mdiobus_register(&msp->smi_bus) < 0)
> 				goto out_unmap;

My bad, I was looking at my local branch which included a merge conflict resolution. Sorry for the noise.

> > >  drivers/net/phy/fixed.c                   |   29 ++++--
> > >  drivers/net/phy/mdio-bitbang.c            |    4 +-
> > >  drivers/net/phy/mdio-ofgpio.c             |   11 +-
> > 
> > Works fine for me. For the mdio-ofgpio part:
> > 
> > Acked-by: Laurent Pinchart <laurentp@...-semaphore.com>
> 
> Thanks!
> 
> 
> > BTW your "phylib: move to dynamic allocation of struct mii_bus"
> > patch fixes a double free in drivers/net/phy/mdio-ofgpio.c. Thanks
> > for catching this.
> 
> Yeah, sorry for not reporting that separately.  (I'm not sure if it's
> worth fixing separately, since deinit probably doesn't happen very
> often.)

No worries. This is not critical, so I'm happy to let your patch fix the bug.

Cheers,

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussee de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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