linux-kernel - Re: [PATCH] regmap: Fix debugfs-file 'registers' mode

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Date:	Tue, 1 Jul 2014 12:33:38 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:	Mark Brown <broonie@...nel.org>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] regmap: Fix debugfs-file 'registers' mode

Hi Uwe,

On Mon, Jun 30, 2014 at 07:45:07AM +0200, Uwe Kleine-König wrote:
> Hi Markus,
> 
> On Sat, Jun 28, 2014 at 03:23:11PM +0200, Markus Pargmann wrote:
> > The macro "REGMAP_ALLOW_WRITE_DEBUGFS" can be used to enable write
> minor nit: I'd not call it "macro", but "cpp symbol" because macro
> sounds more function-like. (There is another "macro" at the end of the
> commit log.)

Okay.

> 
> > support on the registers file in the debugfs. The mode of the file is
> > fixed to 0400 so it is not possible to write the file ever.
> > 
> > This patch fixes the mode by setting it to the correct value depending
> > on the macro.
> > 
> > Cc: Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>
> > Signed-off-by: Markus Pargmann <mpa@...gutronix.de>
> > ---
> > 
> > Hi,
> > 
> > as the kconfig option will probably not be merged, I extracted the mode fix of
> > my previous patch.
> > 
> > Regards,
> > 
> > Markus
> > 
> >  drivers/base/regmap/regmap-debugfs.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
> > index 45d812c0ea77..f45a0a0e0371 100644
> > --- a/drivers/base/regmap/regmap-debugfs.c
> > +++ b/drivers/base/regmap/regmap-debugfs.c
> > @@ -512,7 +512,14 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
> >  			    map, &regmap_reg_ranges_fops);
> >  
> >  	if (map->max_register || regmap_readable(map, 0)) {
> > -		debugfs_create_file("registers", 0400, map->debugfs,
> > +		unsigned int registers_mode;
> > +
> > +		if (IS_ENABLED(REGMAP_ALLOW_WRITE_DEBUGFS))
> > +			registers_mode = 0600;
> > +		else
> > +			registers_mode = 0400;
> > +
> > +		debugfs_create_file("registers", registers_mode, map->debugfs,
> >  				    map, &regmap_map_fops);
> debugfs_create_file takes an umode_t as 2nd parameter. Maybe you should
> pick that type for registers_mode here, too?

Yes that should be changed, thanks.

Regards,

Markus

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