linux-kernel - Re: [PATCH v3 01/19] clk: composite: Add unregister function

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Message-ID: <20160419095250.GA26050@lukather>
Date:	Tue, 19 Apr 2016 11:52:50 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Mike Turquette <mturquette@...libre.com>,
	David Airlie <airlied@...ux.ie>,
	Thierry Reding <thierry.reding@...il.com>,
	Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Daniel Vetter <daniel@...ll.ch>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linux-sunxi@...glegroups.com,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Alexander Kaplan <alex@...tthing.co>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Rob Clark <robdclark@...il.com>
Subject: Re: [PATCH v3 01/19] clk: composite: Add unregister function

Hi,

On Fri, Apr 15, 2016 at 03:28:56PM -0700, Stephen Boyd wrote:
> On 03/23, Maxime Ripard wrote:
> > The composite clock didn't have any unregistration function, which forced
> > us to use clk_unregister directly on it.
> > 
> > While it was already not great from an API point of view, it also meant
> > that we were leaking the clk_composite structure allocated in
> > clk_register_composite.
> > 
> > Add a clk_unregister_composite function to fix this.
> > 
> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > ---
> 
> I'm currently attempting to change the way clks are registered so
> that we don't return clk pointers from clk_register and have
> users add OF clk providers that return clk_hw pointers instead of
> clk pointers. Just a note, that this whole thing should be
> deleted in the next cycle if I can convert everything!

Ok.

> 
> >  drivers/clk/clk-composite.c  | 15 +++++++++++++++
> >  include/linux/clk-provider.h |  1 +
> >  2 files changed, 16 insertions(+)
> > 
> > diff --git a/drivers/clk/clk-composite.c b/drivers/clk/clk-composite.c
> > index 1f903e1f86a2..b0f3b84ebd13 100644
> > --- a/drivers/clk/clk-composite.c
> > +++ b/drivers/clk/clk-composite.c
> > @@ -286,3 +286,18 @@ err:
> >  	kfree(composite);
> >  	return clk;
> >  }
> > +
> > +void clk_unregister_composite(struct clk *clk)
> > +{
> > +	struct clk_composite *composite;
> > +	struct clk_hw *hw;
> > +
> > +	hw = __clk_get_hw(clk);
> > +	if (!hw)
> > +		return;
> > +
> > +	composite = to_clk_composite(hw);
> > +
> > +	clk_unregister(clk);
> > +	kfree(composite);
> > +}
> 
> EXPORT_SYMBOL_GPL?

The register function is not registered, so I don't think that's
necessary.

> Do I need to pick this up?

I have a bunch of other clock patches that need this, so I guess it
would be easier if applied it directly with your acked-by, or if you
could apply it and give a stable branch I can base my future PR on.

Thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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