linux-kernel - Re: [PATCH] clk: Use a separate struct for holding init data.

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Message-ID: <20120502100225.GB24211@n2100.arm.linux.org.uk>
Date:	Wed, 2 May 2012 11:02:25 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Saravana Kannan <skannan@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>,
	Paul Walmsley <paul@...an.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Deepak Saxena <dsaxena@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Jamie Iles <jamie@...ieiles.com>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCH] clk: Use a separate struct for holding init data.

On Wed, May 02, 2012 at 11:58:16AM +0200, Sascha Hauer wrote:
> > diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
> > index 6e58f11..8e97491 100644
> > --- a/drivers/clk/clk-mux.c
> > +++ b/drivers/clk/clk-mux.c
> > @@ -95,6 +95,7 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
> >  {
> >  	struct clk_mux *mux;
> >  	struct clk *clk;
> > +	struct clk_init_data init;
> >  
> >  	/* allocate the mux */
> >  	mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
> > @@ -103,6 +104,12 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
> >  		return ERR_PTR(-ENOMEM);
> >  	}
> >  
> > +	init.name = name;
> > +	init.ops = &clk_mux_ops;
> > +	init.flags = flags;
> > +	init.parent_names = parent_names;
> > +	init.num_parents = num_parents;
> > +
> >  	/* struct clk_mux assignments */
> >  	mux->reg = reg;
> >  	mux->shift = shift;
> > @@ -110,8 +117,7 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
> >  	mux->flags = clk_mux_flags;
> >  	mux->lock = lock;
> 
> There is a mux->hw.init = &init missing here.

What happens to mux->hw.init long term?  Because once this function
returns, that pointer will no longer be valid.  It would be a good
idea to NULL it out in clk_register() once its done with, to ensure
that no one comes up with the idea of using it later.
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