linux-kernel - Re: [patch] backlight: s6e63m0: report ->gamma_table

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Message-Id: <20130129170107.f27c1ed3.akpm@linux-foundation.org>
Date:	Tue, 29 Jan 2013 17:01:07 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jingoo Han <jg1.han@...sung.com>
Cc:	"'Dan Carpenter'" <dan.carpenter@...cle.com>,
	"'Inki Dae'" <inki.dae@...sung.com>,
	"'Richard Purdie'" <rpurdie@...ys.net>,
	"'Florian Tobias Schandinat'" <FlorianSchandinat@....de>,
	linux-fbdev@...r.kernel.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch] backlight: s6e63m0: report ->gamma_table_count
 correctly

On Fri, 25 Jan 2013 11:22:06 +0900
Jingoo Han <jg1.han@...sung.com> wrote:

> On Thursday, January 24, 2013 10:45 PM, Dan Carpenter wrote
> 
> CC'ed Andrew Morton, Inki Dae.
> 
> > 
> > gamma_table has 3 arrays which each hold MAX_GAMMA_LEVEL pointers to
> > int.
> > 
> > The current code sets ->gamma_table_count to 6 on 64bit arches and to 3
> > on 32 bit arches.  It should be 3 on everything.
> 
> Actually, I don't know it is right.
> However, it is certain that this panel is currently used on 32 bit arches
> such as ARM SoCs.

I don't know what gamma_table_count is supposed to do.  The only place
it is used is in s6e63m0_sysfs_show_gamma_table().  That function
doesn't actually show the table - it just prints out gamme_table_count.
Why is that useful?

Ho hum, the patch is clearly correct - the array stores int*'s and the
sysfs file should display "3" for all architectures.  However I suspect
we could just remove the whole sysfs file and nobody would care...

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