linux-kernel - Re: [PATCH 1/3] mfd-core: Don't register supplies from add_device, add register_supply

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Message-ID: <20140519082849.GQ25203@opensource.wolfsonmicro.com>
Date:	Mon, 19 May 2014 09:28:49 +0100
From:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Lee Jones <lee.jones@...aro.org>, Mark Brown <broonie@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Carlo Caione <carlo@...one.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/3] mfd-core: Don't register supplies from add_device,
	add register_supply_aliases()

On Mon, May 19, 2014 at 10:18:11AM +0200, Hans de Goede wrote:
> Hi,
> 
> On 05/19/2014 09:48 AM, Charles Keepax wrote:
> > On Mon, May 19, 2014 at 08:47:05AM +0100, Lee Jones wrote:
> >>> We cannot register supply alias in mfd_add_device before calling
> >>> platform_add_device, for 2 reasons:
> >>> 1) devm resources may not be registered before the (platform) drivers probe
> >>>    method runs
> >>> 2) The platform-dev's name must be set before registering the aliases which
> >>>    happens from platform_add_device.
> >>>
> >>> So stop registering supply aliases from mfd_add_device, and add a
> >>> mfd_register_supply_aliases helper functions for the cell's plaform driver
> >>> probe method to use.
> >>>
> >>> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> >>> ---
> >>>  drivers/mfd/mfd-core.c   | 37 +++++++++++++++++++++----------------
> >>>  include/linux/mfd/core.h |  6 +++++-
> >>>  2 files changed, 26 insertions(+), 17 deletions(-)
> >>
> >> Change looks reasonable to me, but I'd like to have Mark look over the
> >> changes.  If he's okay with them I think it's best for this set to go
> >> through the MFD tree as a whole.
> > 
> > This should already be fixed by this patch:
> > 
> > mfd: core: Don't use devres functions before device is added
> 
> Ah, I did not check next, yes that would fix *half* of the problem,
> the other half is that adding aliases uses dev->name (at least for
> logging, did not check if it is used for anything else) and that is
> not set yet before the device is added.
> 
> Basically the moral of the story is that it is a BAD idea to do
> anything with a device before it is added. So my proposed series
> would replace the "mfd: core: Don't use devres functions before device is added"
> patch.
> 
> Regards,
> 
> Hans

Cool cool, since my patch doesn't seem to have made it in anyway
I guess lets proceed with your series then.

Thanks,
Charles
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