linux-kernel - Re: [PATCH] regmap : make lock/unlock functions customizable.

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Message-ID: <20121012082412.GA9779@mail.gnudd.com>
Date:	Fri, 12 Oct 2012 10:24:12 +0200
From:	Davide Ciminaghi <ciminaghi@...dd.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap : make lock/unlock functions customizable.

On Fri, Oct 12, 2012 at 03:26:09PM +0900, Mark Brown wrote:
> On Mon, Oct 01, 2012 at 11:31:04PM +0200, ciminaghi@...dd.com wrote:
> > From: Davide Ciminaghi <ciminaghi@...dd.com>
> > 
> > It is sometimes convenient for a regmap user to override the standard
> > regmap lock/unlock functions with custom functions.
> 
> This looks good overall but...
> 
> > -static void regmap_lock_mutex(struct regmap *map)
> > +static void regmap_lock_mutex(void *__map)
> >  {
> > +	struct regmap *map = (struct regmap *)__map;
> >  	mutex_lock(&map->mutex);
> 
> ...you should never need to cast away from or to void, if you do there's
> a bug somewhere.

regmap lock/unlock original functions just received a struct regmap * .
I needed a void * for the customized version of such functions, so just
replaced struct regmap * with void *

typedef void (*regmap_lock)(void *);
typedef void (*regmap_unlock)(void *);

The cast isn't actually needed (code compiles with no warnings without it).
I could also do something like this, if you think it's better:

typedef void (*regmap_lock)(struct regmap *, void *);
typedef void (*regmap_unlock)(struct regmap *, void *);

and then ignore the second argument in the default version of the functions.

Thanks and regards
Davide

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